{"id":6078,"date":"2026-08-23T08:36:40","date_gmt":"2026-08-23T08:36:40","guid":{"rendered":"https:\/\/www.pipetechservice.com\/?p=6078"},"modified":"2026-08-23T08:36:43","modified_gmt":"2026-08-23T08:36:43","slug":"common-pipeline-welding-defects","status":"publish","type":"post","link":"https:\/\/www.pipetechservice.com\/ar\/common-pipeline-welding-defects\/","title":{"rendered":"\u0627\u0644\u0639\u064a\u0648\u0628 \u0627\u0644\u0634\u0627\u0626\u0639\u0629 \u0641\u064a \u0644\u062d\u0627\u0645 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0648\u0643\u064a\u0641\u064a\u0629 \u0627\u0644\u0648\u0642\u0627\u064a\u0629 \u0645\u0646\u0647\u0627"},"content":{"rendered":"<p>\u0639\u064a\u0648\u0628 \u0644\u062d\u0627\u0645 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0647\u064a \u0627\u0644\u0627\u0646\u0642\u0637\u0627\u0639\u0627\u062a \u0627\u0644\u062a\u064a \u062a\u0624\u062f\u064a \u0625\u0644\u0649 \u0639\u062f\u0645 \u0642\u0628\u0648\u0644 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\u00ab\u0627\u0644\u0623\u0633\u0627\u0633\u00bb\u060c \u0644\u0630\u0627 \u064a\u064f\u0639\u062f \u0627\u0644\u062c\u062f\u0648\u0644 \u0645\u0631\u062c\u0639\u064b\u0627 \u0633\u0631\u064a\u0639\u064b\u0627 \u0623\u062b\u0646\u0627\u0621 \u0627\u0644\u062a\u062e\u0637\u064a\u0637 \u0644\u0639\u0645\u0644\u064a\u0629 \u0627\u0644\u0641\u062d\u0635.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0627\u0644\u0645\u0639\u0644\u0645\u0629<\/th><th>\u0627\u0644\u0642\u064a\u0645\u0629<\/th><th>\u0627\u0644\u0633\u064a\u0627\u0642<\/th><th>\u0627\u0644\u0623\u0633\u0627\u0633<\/th><\/tr><\/thead><tbody><tr><td>\u062a\u062d\u0645\u064a\u0635 \u0627\u0644\u0623\u0642\u0637\u0627\u0628 \u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629 \u0645\u0646\u062e\u0641\u0636\u0629 \u0627\u0644\u0647\u064a\u062f\u0631\u0648\u062c\u064a\u0646<\/td><td>300-400 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629<\/td><td>\u0642\u0628\u0644 \u0627\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645<\/td><td>API 1104 \/ \u0627\u0644\u0634\u0631\u0643\u0629 \u0627\u0644\u0645\u0635\u0646\u0639\u0629<\/td><\/tr><tr><td>\u062d\u0627\u0645\u0644 \u0641\u0631\u0646 \u0642\u0636\u064a\u0628<\/td><td>120-150 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629<\/td><td>\u0628\u064a\u0646 \u0627\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645\u0627\u062a<\/td><td>\u0627\u0644\u0634\u0631\u0643\u0629 \u0627\u0644\u0645\u0635\u0646\u0639\u0629<\/td><\/tr><tr><td>\u062d\u062f \u0627\u0644\u062a\u0639\u0631\u0636 \u0644\u0644\u0645\u0648\u0627\u062f \u0627\u0644\u0645\u0646\u0628\u0639\u062b\u0629 \u0645\u0646 \u0627\u0644\u0639\u0644\u0628 \u0627\u0644\u0645\u0641\u062a\u0648\u062d\u0629<\/td><td>4 \u0633\u0627\u0639\u0627\u062a<\/td><td>\u0628\u0639\u062f \u0625\u062e\u0631\u0627\u062c\u0647\u0627 \u0645\u0646 \u0627\u0644\u0641\u0631\u0646<\/td><td>\u0627\u0644\u0634\u0631\u0643\u0629 \u0627\u0644\u0645\u0635\u0646\u0639\u0629<\/td><\/tr><tr><td>\u0627\u0644\u062a\u0633\u062e\u064a\u0646 \u0627\u0644\u0645\u0633\u0628\u0642 \u0644\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0643\u0631\u0628\u0648\u0646\u064a<\/td><td>100-150 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629<\/td><td>\u062e\u0637\u0631 \u0627\u0644\u062a\u0643\u062b\u0641 \/ \u0627\u0644\u0642\u0627\u0639\u062f\u0629 \u0627\u0644\u0645\u064a\u062f\u0627\u0646\u064a\u0629<\/td><td>WPS<\/td><\/tr><tr><td>\u0639\u062a\u0628\u0629 \u0627\u0644\u0632\u062c\u0627\u062c \u0627\u0644\u0623\u0645\u0627\u0645\u064a<\/td><td>\u062d\u0648\u0627\u0644\u064a 16 \u0643\u0645\/\u0633\u0627\u0639\u0629<\/td><td>\u0627\u0644\u062d\u0645\u0627\u064a\u0629 \u0645\u0646 \u062b\u0627\u0646\u064a \u0623\u0643\u0633\u064a\u062f \u0627\u0644\u0643\u0631\u0628\u0648\u0646<\/td><td>\u0627\u0644\u062a\u062f\u0631\u064a\u0628 \u0627\u0644\u0645\u064a\u062f\u0627\u0646\u064a<\/td><\/tr><tr><td>\u062a\u0623\u062c\u064a\u0644 \u0625\u062c\u0631\u0627\u0621 \u0627\u062e\u062a\u0628\u0627\u0631 \u0627\u0644\u062a\u062d\u0645\u0644 \u0644\u0644\u062a\u0634\u0642\u0642\u0627\u062a \u0642\u0628\u0644 \u0627\u0644\u0641\u062d\u0635 \u063a\u064a\u0631 \u0627\u0644\u062a\u062f\u0645\u064a\u0631\u064a \u0627\u0644\u0646\u0647\u0627\u0626\u064a<\/td><td>48 \u0633\u0627\u0639\u0629<\/td><td>\u0627\u0644\u0645\u0641\u0627\u0635\u0644 \u0627\u0644\u0645\u0639\u0631\u0636\u0629 \u0644\u0645\u062e\u0627\u0637\u0631 \u0627\u0644\u0647\u064a\u062f\u0631\u0648\u062c\u064a\u0646<\/td><td>API 1104 \/ \u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0645\u0634\u0631\u0648\u0639<\/td><\/tr><tr><td>\u062d\u062f \u0627\u0644\u0642\u0628\u0648\u0644 \u0644\u0623\u062e\u062f\u0648\u062f \u0645\u0642\u062f\u0645\u0629 \u0627\u0644\u062d\u0630\u0627\u0621<\/td><td>1\/32 \u0628\u0648\u0635\u0629 (0.8 \u0645\u0645)<\/td><td>\u0627\u0644\u062c\u062f\u0627\u0631 \u0627\u0644\u0645\u062a\u0628\u0642\u064a \u064a\u062a\u0648\u0627\u0641\u0642 \u0645\u0639 \u0627\u0644\u062a\u0635\u0645\u064a\u0645<\/td><td>API 1104<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-are-the-most-common-pipeline-welding-defects\">\u0645\u0627 \u0647\u064a \u0639\u064a\u0648\u0628 \u0644\u062d\u0627\u0645 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0623\u0643\u062b\u0631 \u0634\u064a\u0648\u0639\u064b\u0627\u061f<\/h2>\n\n\n\n<p>\u062a\u0646\u0642\u0633\u0645 \u0627\u0644\u0639\u064a\u0648\u0628 \u0627\u0644\u062a\u064a \u062a\u062a\u0633\u0628\u0628 \u0641\u064a \u0625\u0639\u0627\u062f\u0629 \u0627\u0644\u0644\u062d\u0627\u0645\u0627\u062a \u0644\u0644\u0625\u0635\u0644\u0627\u062d \u0625\u0644\u0649 \u0645\u062c\u0645\u0648\u0639\u062a\u064a\u0646: \u0627\u0644\u0634\u0642\u0648\u0642 \u0648\u0627\u0644\u0627\u0646\u0642\u0637\u0627\u0639\u0627\u062a. \u0648\u062a\u0634\u0645\u0644 \u0627\u0644\u0634\u0642\u0648\u0642: \u062a\u0634\u0642\u0642\u0627\u062a \u0627\u0644\u062a\u0635\u0644\u0628\u060c \u0648\u0627\u0644\u062a\u0634\u0642\u0642 \u0627\u0644\u0628\u0627\u0631\u062f \u0627\u0644\u0645\u062a\u0623\u062e\u0631\u060c \u0648\u062a\u0634\u0642\u0642\u0627\u062a \u0627\u0644\u062d\u0641\u0631\u0629\u061b \u0623\u0645\u0627 \u0627\u0644\u0627\u0646\u0642\u0637\u0627\u0639\u0627\u062a \u0641\u062a\u0634\u0645\u0644: \u0627\u0644\u0645\u0633\u0627\u0645\u064a\u0629\u060c \u0648\u0627\u0644\u062e\u0628\u062b \u0627\u0644\u0645\u062d\u0628\u0648\u0633\u060c \u0648\u0641\u0634\u0644 \u0627\u0644\u0627\u0646\u0635\u0647\u0627\u0631\u060c \u0648\u062c\u0630\u0648\u0631 \u0627\u0644\u0644\u062d\u0627\u0645 \u063a\u064a\u0631 \u0627\u0644\u0645\u0645\u0644\u0648\u0621\u0629\u060c \u0648\u0623\u062e\u0627\u062f\u064a\u062f \u0627\u0644\u062d\u0627\u0641\u0629\u060c \u0648\u062a\u0641\u0627\u0648\u062a\u0627\u062a \u0627\u0644\u0633\u0637\u062d \u0645\u062b\u0644 \u0627\u0644\u0631\u0630\u0627\u0630 \u0648\u0639\u0644\u0627\u0645\u0627\u062a \u0627\u0644\u0642\u0648\u0633 \u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0626\u064a.<\/p>\n\n\n\n<p>\u0644\u0643\u0644 \u0639\u0627\u0626\u0644\u0629 \u0623\u0633\u0628\u0627\u0628\u0647\u0627 \u0627\u0644\u062e\u0627\u0635\u0629\u060c \u0648\u0648\u0633\u0627\u0626\u0644 \u0627\u0644\u0648\u0642\u0627\u064a\u0629 \u0627\u0644\u062e\u0627\u0635\u0629 \u0628\u0647\u0627\u060c \u0648\u0637\u0631\u0642 \u0627\u0644\u0643\u0634\u0641 \u0627\u0644\u062e\u0627\u0635\u0629 \u0628\u0647\u0627\u060c \u0648\u0644\u0647\u0630\u0627 \u0627\u0644\u0633\u0628\u0628 \u062e\u0635\u0635\u0646\u0627 \u0644\u0643\u0644 \u0645\u0646\u0647\u0627 \u0642\u0633\u0645\u064b\u0627 \u0645\u0646\u0641\u0635\u0644\u0627\u064b \u0623\u062f\u0646\u0627\u0647.<\/p>\n\n\n\n<p>\u0641\u064a \u0628\u0631\u0627\u0645\u062c \u0627\u0644\u0625\u0635\u0644\u0627\u062d \u0627\u0644\u062a\u064a \u0646\u0641\u0630\u062a\u0647\u0627 \u0641\u0631\u0642\u0646\u0627 \u0644\u0635\u0627\u0644\u062d \u0627\u0644\u0645\u0634\u063a\u0644\u064a\u0646\u060c \u0634\u0643\u0644\u062a \u0627\u0644\u0645\u0633\u0627\u0645\u064a\u0629 \u0648\u0627\u0644\u062e\u0628\u062b \u0627\u0644\u0645\u062d\u0628\u0648\u0633 \u0645\u0639\u064b\u0627 \u0645\u0627 \u064a\u0642\u0627\u0631\u0628 \u0646\u0635\u0641 \u062d\u0627\u0644\u0627\u062a \u0627\u0644\u0631\u0641\u0636 \u0627\u0644\u0646\u0627\u062a\u062c\u0629 \u0639\u0646 \u0627\u0644\u0641\u062d\u0635 \u0628\u0627\u0644\u0623\u0634\u0639\u0629 \u0641\u064a \u062a\u0644\u0643 \u0627\u0644\u0645\u0634\u0627\u0631\u064a\u0639\u060c \u0641\u064a \u062d\u064a\u0646 \u0633\u064a\u0637\u0631\u062a \u062d\u0627\u0644\u0627\u062a \u0641\u0634\u0644 \u0627\u0644\u0627\u0646\u0635\u0647\u0627\u0631 \u0648\u062c\u0630\u0648\u0631 \u0627\u0644\u0644\u062d\u0627\u0645 \u063a\u064a\u0631 \u0627\u0644\u0645\u0645\u0644\u0648\u0621\u0629 \u0639\u0644\u0649 \u0625\u0635\u0644\u0627\u062d\u0627\u062a \u0645\u0646\u0637\u0642\u0629 \u0627\u0644\u062c\u0630\u0631 \u0627\u0644\u062d\u0631\u062c\u0629.<\/p>\n\n\n\n<p>\u0648\u064a\u062a\u0648\u0627\u0641\u0642 \u0647\u0630\u0627 \u0627\u0644\u0646\u0645\u0637 \u0645\u0639 \u062a\u062c\u0631\u0628\u0629 \u0645\u0642\u0627\u0648\u0644\u064a \u0641\u062d\u0635 \u062e\u0637\u0648\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0628\u0634\u0643\u0644 \u0639\u0627\u0645\u060c \u0648\u0644\u0647\u0630\u0627 \u0627\u0644\u0633\u0628\u0628 \u062a\u0643\u0631\u0633 \u0641\u0631\u0642\u0646\u0627 \u2014 \u0627\u0644\u062a\u064a \u062a\u062d\u0645\u0644 \u0645\u0624\u0647\u0644\u0627\u062a \u0641\u064a \u0645\u062c\u0627\u0644 \u0627\u0644\u0644\u062d\u0627\u0645 \u0648\u0627\u0644\u0625\u062c\u0631\u0627\u0621\u0627\u062a \u0648\u0641\u0642\u064b\u0627 \u0644\u0645\u0639\u0627\u064a\u064a\u0631 API 1104 \u0648 ASME B31.4\/B31.8 \u2014 \u0648\u0642\u062a\u064b\u0627 \u0641\u064a \u0627\u0644\u062a\u0646\u0638\u064a\u0641 \u0648\u0627\u0644\u062a\u0642\u0646\u064a\u0627\u062a \u064a\u0648\u0627\u0632\u064a \u0627\u0644\u0648\u0642\u062a \u0627\u0644\u0630\u064a \u062a\u062e\u0635\u0635\u0647 \u0644\u0644\u0639\u064a\u0648\u0628 \u0646\u0641\u0633\u0647\u0627.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0645\u062c\u0645\u0648\u0639\u0629 \u0627\u0644\u0639\u064a\u0648\u0628<\/th><th>\u0627\u0644\u0645\u0643\u0627\u0646 \u0627\u0644\u0630\u064a \u064a\u062a\u0634\u0643\u0644 \u0641\u064a\u0647<\/th><th>\u0627\u0644\u0633\u0628\u0628 \u0627\u0644\u0631\u0626\u064a\u0633\u064a<\/th><th>\u0627\u0644\u0648\u0642\u0627\u064a\u0629 \u0627\u0644\u0623\u0648\u0644\u064a\u0629<\/th><th>\u0627\u0644\u0643\u0634\u0641 \u0627\u0644\u0623\u0648\u0644\u064a<\/th><th>\u0627\u0644\u0642\u0628\u0648\u0644<\/th><\/tr><\/thead><tbody><tr><td>\u0627\u0644\u0645\u0633\u0627\u0645\u064a\u0629<\/td><td>\u0645\u0639\u062f\u0646 \u0627\u0644\u0644\u062d\u0627\u0645<\/td><td>\u0627\u0644\u063a\u0627\u0632 \u0627\u0644\u0646\u0627\u062a\u062c \u0639\u0646 \u0627\u0644\u062a\u0644\u0648\u062b\u060c \u0648\u0627\u0644\u0645\u0648\u0627\u062f \u0627\u0644\u0627\u0633\u062a\u0647\u0644\u0627\u0643\u064a\u0629 \u0627\u0644\u0631\u0637\u0628\u0629\u060c \u0648\u0641\u0642\u062f\u0627\u0646 \u0627\u0644\u062d\u0645\u0627\u064a\u0629<\/td><td>\u062d\u0627\u0641\u0629 \u0645\u0627\u0626\u0644\u0629 \u0646\u0638\u064a\u0641\u0629\u060c \u0623\u0642\u0637\u0627\u0628 \u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629 \u062c\u0627\u0641\u0629\u060c \u062d\u0645\u0627\u064a\u0629 \u0645\u0646 \u0627\u0644\u0631\u064a\u0627\u062d<\/td><td>RT\u060c VT<\/td><td>\u0645\u062d\u062f\u0648\u062f \u0627\u0644\u062d\u062c\u0645\u061b \u0631\u0641\u0636 \u0627\u0644\u0639\u0646\u0627\u0642\u064a\u062f\/\u0627\u0644\u062b\u0642\u0648\u0628 \u0627\u0644\u062f\u0648\u062f\u064a\u0629<\/td><\/tr><tr><td>\u0634\u0648\u0627\u0626\u0628 \u0627\u0644\u062e\u0628\u062b<\/td><td>\u0628\u064a\u0646 \u0627\u0644\u0645\u0631\u0627\u062a\u060c \u0627\u0644\u062c\u0630\u0631<\/td><td>\u0636\u0639\u0641 \u0627\u0644\u062a\u0646\u0638\u064a\u0641 \u0628\u064a\u0646 \u0627\u0644\u0645\u0631\u0627\u062d\u0644\u060c \u0627\u0646\u062e\u0641\u0627\u0636 \u0627\u0644\u062a\u064a\u0627\u0631<\/td><td>\u0642\u0645 \u0628\u0627\u0644\u062a\u0646\u0638\u064a\u0641 \u0641\u064a \u0643\u0644 \u0645\u0633\u0627\u0631\u060c \u0648\u0627\u0633\u062a\u062e\u062f\u0645 \u062a\u064a\u0627\u0631\u064b\u0627 \u0643\u0627\u0641\u064a\u064b\u0627<\/td><td>RT\u060c UT<\/td><td>\u0627\u0644\u062d\u062c\u0645 \u0627\u0644\u0645\u062d\u062f\u0648\u062f \u0645\u0642\u0627\u0628\u0644 \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631<\/td><\/tr><tr><td>\u0639\u062f\u0645 \u0627\u0644\u0627\u0646\u062f\u0645\u0627\u062c<\/td><td>\u0627\u0644\u062c\u0627\u0646\u0628 \u0627\u0644\u0645\u0627\u0626\u0644\u060c \u0627\u0644\u062d\u062f \u0627\u0644\u0641\u0627\u0635\u0644 \u0628\u064a\u0646 \u0627\u0644\u0645\u0645\u0631\u0627\u062a<\/td><td>\u0627\u0646\u062e\u0641\u0627\u0636 \u0645\u062f\u062e\u0644\u0627\u062a \u0627\u0644\u062d\u0631\u0627\u0631\u0629\u060c \u0632\u0627\u0648\u064a\u0629 \u063a\u064a\u0631 \u0635\u062d\u064a\u062d\u0629\u060c \u062a\u0644\u0648\u062b<\/td><td>\u0627\u0644\u0645\u0639\u0644\u0645\u0627\u062a \u0648\u0627\u0644\u062a\u0642\u0646\u064a\u0629 \u0627\u0644\u0635\u062d\u064a\u062d\u0629<\/td><td>UT\u060c RT<\/td><td>\u0627\u0644\u0639\u064a\u0648\u0628 \u0627\u0644\u0645\u0633\u0645\u0648\u062d \u0628\u0648\u062c\u0648\u062f\u0647\u0627 \u0641\u064a \u0627\u0644\u0644\u062d\u0627\u0645\u0627\u062a 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class=\"wp-block-uagb-image__figure\"><img loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/08\/pipeline-weld-defect-locations-cross-section.png ,https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/08\/pipeline-weld-defect-locations-cross-section.png 780w, https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/08\/pipeline-weld-defect-locations-cross-section.png 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/08\/pipeline-weld-defect-locations-cross-section.png\" alt=\"Cross-section of a pipeline girth weld showing where common welding defects form: undercut at the toes, porosity and slag inside the weld metal, lack of fusion at the bevel side, incomplete penetration at the root\" class=\"uag-image-6081\" width=\"800\" height=\"600\" title=\"pipeline-weld-defect-locations-cross-section\" role=\"img\" \/><\/figure><\/div>\n\n\n\n<p>\u0627\u0644\u0634\u0643\u0644 1. \u064a\u064f\u0638\u0647\u0631 \u0627\u0644\u0645\u0642\u0637\u0639 \u0627\u0644\u0639\u0631\u0636\u064a \u0644\u0644\u0644\u062d\u0627\u0645 \u0627\u0644\u0645\u062d\u064a\u0637\u064a \u0627\u0644\u0623\u0645\u0627\u0643\u0646 \u0627\u0644\u062a\u064a \u062a\u062a\u0634\u0643\u0644 \u0641\u064a\u0647\u0627 \u0643\u0644 \u0639\u064a\u0648\u0628 \u0627\u0644\u0644\u062d\u0627\u0645 \u0627\u0644\u0634\u0627\u0626\u0639\u0629: \u0627\u0644\u0623\u062e\u0627\u062f\u064a\u062f \u0627\u0644\u0633\u0637\u062d\u064a\u0629 \u0639\u0646\u062f \u0627\u0644\u062d\u0627\u0641\u0629\u060c \u0648\u0627\u0644\u062a\u062c\u0627\u0648\u064a\u0641 \u0648\u0627\u0644\u0645\u0648\u0627\u062f \u0627\u0644\u0645\u0633\u0627\u0639\u062f\u0629 \u0627\u0644\u0645\u062d\u0628\u0648\u0633\u0629 \u062f\u0627\u062e\u0644 \u0645\u0639\u062f\u0646 \u0627\u0644\u0644\u062d\u0627\u0645\u060c \u0648\u0641\u0634\u0644 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class=\"wp-block-list\">\n<li><strong>\u0627\u0644\u062a\u0644\u0648\u062b:<\/strong>\u00a0\u064a\u064f\u0639\u062f \u0627\u0644\u0635\u062f\u0623 \u0648\u0627\u0644\u0632\u064a\u062a \u0648\u0627\u0644\u0637\u0644\u0627\u0621 \u0648\u0627\u0644\u0631\u0637\u0648\u0628\u0629 \u0648\u0627\u0644\u0645\u0627\u0621 \u0627\u0644\u0645\u0648\u062c\u0648\u062f \u0639\u0644\u0649 \u0627\u0644\u062d\u0627\u0641\u0629 \u0627\u0644\u0645\u0627\u0626\u0644\u0629 \u0645\u0635\u062f\u0631\u064b\u0627 \u0644\u0644\u063a\u0627\u0632 \u0627\u0644\u0630\u064a \u064a\u062a\u0633\u0628\u0628 \u0641\u064a \u062d\u062f\u0648\u062b \u0627\u0644\u0645\u0633\u0627\u0645\u064a\u0629\u060c \u0643\u0645\u0627 \u064a\u064f\u0634\u0643\u0644\u0648\u0646 \u0627\u0644\u0634\u0648\u0627\u0626\u0628 \u0627\u0644\u062a\u064a \u062a\u062d\u0628\u0633 \u0627\u0644\u062e\u0628\u062b.<\/li>\n\n\n\n<li><strong>\u0627\u0644\u0645\u0648\u0627\u062f 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\u0648\u0625\u062c\u0647\u0627\u062f \u0627\u0644\u0634\u062f. \u0648\u064a\u0645\u0643\u0646 \u0627\u0644\u0648\u0642\u0627\u064a\u0629 \u0645\u0646\u0647 \u0628\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0645\u0648\u0627\u062f \u0627\u0633\u062a\u0647\u0644\u0627\u0643\u064a\u0629 \u0645\u0646\u062e\u0641\u0636\u0629 \u0627\u0644\u0647\u064a\u062f\u0631\u0648\u062c\u064a\u0646\u060c \u0648\u0627\u0644\u062a\u0633\u062e\u064a\u0646 \u0627\u0644\u0645\u0633\u0628\u0642\u060c \u0648\u0627\u0644\u062a\u062d\u0643\u0645 \u0628\u064a\u0646 \u0627\u0644\u0645\u0631\u0627\u062d\u0644\u060c \u0648\u0627\u0644\u062a\u0633\u062e\u064a\u0646 \u0627\u0644\u0644\u0627\u062d\u0642\u060c \u0648\u0627\u0644\u0641\u062d\u0635 \u0628\u0639\u062f \u0645\u0631\u0648\u0631 48 \u0633\u0627\u0639\u0629\u060c \u0648\u064a\u062a\u0645 \u062a\u0646\u0627\u0648\u0644 \u0647\u0630\u0627 \u0627\u0644\u0645\u0648\u0636\u0648\u0639 \u0628\u0627\u0644\u062a\u0641\u0635\u064a\u0644 \u0641\u064a \u062f\u0644\u064a\u0644\u0646\u0627 \u0627\u0644\u0645\u0646\u0641\u0635\u0644 \u062d\u0648\u0644 \u0627\u0644\u062a\u0635\u062f\u0639 \u0627\u0644\u0647\u064a\u062f\u0631\u0648\u062c\u064a\u0646\u064a \u0641\u064a \u0644\u062d\u0627\u0645 \u062e\u0637\u0648\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628.<\/p>\n\n\n\n<p>\u062a\u0641\u0631\u0636 \u0639\u0645\u0644\u064a\u0627\u062a \u0627\u0644\u0644\u062d\u0627\u0645 \u0623\u062b\u0646\u0627\u0621 \u0627\u0644\u062a\u0634\u063a\u064a\u0644\u060c \u0645\u062b\u0644 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0633\u0627\u062e\u0646\u060c \u0645\u062c\u0645\u0648\u0639\u0629 \u062b\u0627\u0646\u064a\u0629 \u0645\u0646 \u0627\u0644\u0642\u064a\u0648\u062f: \u0641\u0627\u0644\u0623\u0646\u0628\u0648\u0628 \u0645\u0645\u062a\u0644\u0626 \u0648\u062a\u062d\u062a \u0627\u0644\u0636\u063a\u0637\u060c \u0644\u0630\u0627 \u0641\u0625\u0646 \u0627\u062e\u062a\u0631\u0627\u0642 \u0627\u0644\u0645\u0639\u062f\u0646 \u0648\u0627\u0644\u062a\u0628\u0631\u064a\u062f \u0627\u0644\u0633\u0631\u064a\u0639 \u0644\u0645\u0646\u0637\u0642\u0629 \u0627\u0644\u0644\u062d\u0627\u0645 \u064a\u0632\u064a\u062f\u0627\u0646 \u0645\u0646 \u0643\u0644 \u0645\u0646 \u0627\u0644\u0645\u0633\u0627\u0645\u064a\u0629 \u0648\u062e\u0637\u0631 \u0627\u0644\u062a\u0634\u0642\u0642 \u0627\u0644\u0628\u0627\u0631\u062f. \u0648\u062a\u064f\u0646\u0641\u064e\u0651\u0630 \u0647\u0630\u0647 \u0627\u0644\u0623\u0639\u0645\u0627\u0644 \u0628\u0627\u062a\u0628\u0627\u0639 \u0625\u062c\u0631\u0627\u0621\u0627\u062a \u062e\u0627\u0635\u0629\u060c \u0648\u062d\u062f\u0648\u062f \u0623\u0642\u0644 \u0644\u0645\u062f\u062e\u0644\u0627\u062a \u0627\u0644\u062d\u0631\u0627\u0631\u0629\u060c \u0648\u063a\u0627\u0644\u0628\u064b\u0627 \u0628\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0645\u0639\u062f\u0627\u062a \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0633\u0627\u062e\u0646 \u0627\u0644\u062a\u064a \u062a\u0645 \u062a\u062d\u062f\u064a\u062f \u0623\u0628\u0639\u0627\u062f\u0647\u0627 \u0648\u062a\u0623\u0647\u064a\u0644\u0647\u0627 \u0644\u062a\u0646\u0627\u0633\u0628 \u062d\u0627\u0644\u0629 \u0627\u0644\u062e\u0637 \u0628\u0627\u0644\u0636\u0628\u0637.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-reheat-cracking-and-lamellar-cracking\">\u0627\u0644\u062a\u0634\u0642\u0642 \u0627\u0644\u0646\u0627\u062a\u062c \u0639\u0646 \u0625\u0639\u0627\u062f\u0629 \u0627\u0644\u062a\u0633\u062e\u064a\u0646 \u0648\u0627\u0644\u062a\u0634\u0642\u0642 \u0627\u0644\u0631\u0642\u0627\u0626\u0642\u064a<\/h3>\n\n\n\n<p>Reheat cracking occurs during post-weld heat treatment or high-temperature service in thick-wall, creep-resistant steels, and lamellar cracking tears the parent plate in the through-thickness direction under high restraint. Both are rare in ordinary carbon steel pipelines and are controlled by material selection, joint design, and qualified heat treatment procedures rather than by daily field technique.<\/p>\n\n\n\n<p>The practical message is that cracks are prevented, not repaired cheaply. When a crack is found, it is cut out completely, the removal is verified, and the joint is re-welded and re-inspected; a repair that hides a crack tip guarantees it will return.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-prevent-pipeline-welding-defects-7-field-rules\">How to Prevent Pipeline Welding Defects: 7 Field Rules<\/h2>\n\n\n\n<p>Prevention is a system, not a checklist, and most welding defects can be prevented with the seven rules below working together. Each rule is written into the qualified procedures our crews use on pipeline construction, maintenance, and repair jobs, and skipping one multiplies the risk of the others.<\/p>\n\n\n\n<div class=\"wp-block-uagb-image aligncenter uagb-block-4c9e388a wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-center\"><figure class=\"wp-block-uagb-image__figure\"><img loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/08\/pipeline-welding-defect-prevention-workflow.png ,https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/08\/pipeline-welding-defect-prevention-workflow.png 780w, https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/08\/pipeline-welding-defect-prevention-workflow.png 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/08\/pipeline-welding-defect-prevention-workflow.png\" alt=\"Workflow to prevent pipeline welding defects: WPS qualification, consumable control, joint cleaning and fit-up, parameter control, environment control, automatic welding, and non-destructive testing\" class=\"uag-image-6082\" width=\"800\" height=\"600\" title=\"pipeline-welding-defect-prevention-workflow\" role=\"img\" \/><\/figure><\/div>\n\n\n\n<p>Figure 2. A seven-stage field workflow prevents pipeline welding defects from procedure qualification to final inspection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-qualify-the-wps-and-weld-inside-it\">1. Qualify the WPS and Weld Inside It<\/h3>\n\n\n\n<p>The welding procedure specification fixes the process, consumables, current range, travel speed, preheat, interpass temperature, and positions, and a WPS qualified to API 1104 has already proven the combination produces sound welds. Our crews treat any parameter reading outside the WPS range as a stop-work event: the weld is halted, the cause is found, and the joint is evaluated before work resumes. The procedure is not a suggestion; it is the baseline that makes every other rule measurable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-control-consumables-from-the-oven-to-the-arc\">2. Control Consumables From the Oven to the Arc<\/h3>\n\n\n\n<p>Consumables carry hydrogen and moisture directly into the weld. Bake low-hydrogen electrodes at the manufacturer&#8217;s temperature, typically 300-400 \u00b0C, hold them in rod ovens at 120-150 \u00b0C, and limit opened-can exposure to four hours. Check shielding gas flow and hoses before each shift, and store filler wire and fluxes in dry, sealed conditions.<\/p>\n\n\n\n<p>In our welding department, opened electrode cans are marked with the time they left the oven, and a rod exposed too long is scrapped, not reused. The rule costs almost nothing and eliminates the largest single source of porosity.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-clean-dry-and-fit-the-joint\">3. Clean, Dry, and Fit the Joint<\/h3>\n\n\n\n<p>Clean the joint faces and 25 mm on each side down to bare metal, dry the bevel with a preheat temperature of 100-150 \u00b0C where condensation is possible, and verify root gap, land, bevel angle, and alignment with gauges on every joint. Internal line-up clamps hold alignment through the root pass, and misalignment beyond the WPS allowance is corrected before welding, not during it.<\/p>\n\n\n\n<p>Fit-up includes the fittings and bends that feed the weld line. A bend made with&nbsp;pipeline cold bending&nbsp;that distorts the gap or wall thickness in the weld zone starts the girth weld from a defect, so we measure the weld prep on every bend as carefully as on every straight pipe joint.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-weld-with-correct-parameters-and-technique\">4. Weld With Correct Parameters and Technique<\/h3>\n\n\n\n<p>Set current, voltage, and travel speed from the welding procedure specification, hold the travel angle that keeps the arc on the pool edge, limit weave width, fill craters, and match technique to the position. Root passes on the 5G and 6G positions deserve the most attention because they have the least visibility, and they are where the&nbsp;pipeline welding positions&nbsp;differ most in difficulty.<\/p>\n\n\n\n<p>Technique errors do not announce themselves until the film or the scan, so we verify the root pass visually before the fill passes. Correcting a root defect at that point is a grinder job; correcting it after the weld is complete is a cut-out job, which typically costs several times the original weld pass and adds days to a tie-in schedule.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-control-the-environment\">5. Control the Environment<\/h3>\n\n\n\n<p>Wind strips shielding gas and produces porosity; humidity and rain add moisture; cold increases cooling rate and hardness. Erect wind screens above roughly 16 km\/h, stop welding in rain, preheat to dry the joint, and raise the temperature in cold weather per the WPS.<\/p>\n\n\n\n<p>On a recent 36-inch tie-in on a coastal project, humidity was high enough that condensation formed on the bevel within minutes of cleaning. We heated the joint and kept it hot until the surface stayed dry, checking the temperature with an infrared gun before every pass. The radiography came back clean; the discipline is what made it clean.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-6-use-automatic-welding-for-consistency\">6. Use Automatic Welding for Consistency<\/h3>\n\n\n\n<p>Automatic pipeline welding removes the human variables of travel speed, arc length, and weave width, which are the variables behind most fusion failures and toe grooves. Dual-torch systems on large-diameter pipe hold the parameters within tight tolerances and log them for every weld, giving inspectors a record instead of a memory.<\/p>\n\n\n\n<p>Automatic welding does not replace the WPS or the other six rules; it makes them easier to hold. On our large-diameter projects, we pair&nbsp;automatic pipeline welding&nbsp;with manual root passes where the WPS calls for them, and the parameter logs go into the weld book with the radiographs. If automatic welding is new to your project,&nbsp;our welding engineers will review your WPS and NDT requirements&nbsp;and recommend the right process, usually within 24 hours.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-7-inspect-every-weld-hold-the-high-risk-ones\">7. Inspect Every Weld, Hold the High-Risk Ones<\/h3>\n\n\n\n<p>Welding inspection is the last prevention rule because it catches what the first six missed. Visual testing is applied to every weld, radiography or ultrasonic testing per the code and contract, magnetic particle testing on surface-critical toes, and a 48-hour hold before final NDT where hydrogen cracking is a risk. Hardness surveys verify the microstructure on high-strength or sour-service welds.<\/p>\n\n\n\n<p>The inspection result feeds back into the process: a defect pattern from the first welds of a run changes the next welds, not just the rejected ones. That feedback loop is why our rejection rates drop across a project as the crew, the procedure, and the inspection settle into each other.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-do-you-detect-pipeline-welding-defects-ndt-methods-compared\">How Do You Detect Pipeline Welding Defects? NDT Methods Compared<\/h2>\n\n\n\n<p>The different types of welding defects each have a detection method that finds them best, and a welding inspection program uses several methods together because no single one sees everything. Visual checks are the baseline, volumetric methods look inside the weld, and surface methods find toe and surface cracks.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>NDT method<\/th><th>Defects it detects<\/th><th>Strengths<\/th><th>Limitations<\/th><\/tr><\/thead><tbody><tr><td>Visual testing (VT)<\/td><td>Toe grooves, spatter, arc strikes, bead profile, surface porosity<\/td><td>Fast, cheap, applied to every weld<\/td><td>Surface only<\/td><\/tr><tr><td>Radiographic testing (RT)<\/td><td>Porosity, entrapped slag, unfilled roots, gross fusion failures<\/td><td>Permanent film or digital record<\/td><td>Low sensitivity to tight planar cracks<\/td><\/tr><tr><td>Ultrasonic testing (UT, PAUT)<\/td><td>Fusion failures, cracks, slag, unfilled roots, wall loss<\/td><td>Excellent for planar defects; phased array adds imaging<\/td><td>Requires skilled operators and couplant<\/td><\/tr><tr><td>Magnetic particle testing (MT)<\/td><td>Surface and near-surface toe cracks<\/td><td>Fast, sensitive to tight surface cracks<\/td><td>Ferromagnetic materials only<\/td><\/tr><tr><td>Penetrant testing (PT)<\/td><td>Surface-opening defects and porosity<\/td><td>Simple, works on any material<\/td><td>Surface only; requires clean surface<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Cross-country pipeline girth welds are typically inspected by radiographic testing or ultrasonic testing at the code-required percentage, with MT on the toes of high-risk welds and visual testing on every joint. Our full inspection sequence, including hold times and acceptance rules, is covered in our&nbsp;pipeline welding inspection checklist. Not sure which NDT combination your code and contract require?&nbsp;Send us your project specification&nbsp;for a free inspection plan review.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-when-is-a-pipeline-welding-defect-acceptable\">When Is a Pipeline Welding Defect Acceptable?<\/h2>\n\n\n\n<p>Acceptance is decided by the code named in the contract, usually API 1104 Section 9 for cross-country pipelines, with ASME B31.4 and B31.8 for liquid and gas transmission systems, and by the project specification on top of the code. Welding inspection does not judge by eye; every indication is compared against the code&#8217;s size limits.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cracks:<\/strong>\u00a0never acceptable in any form, any size, or any location.<\/li>\n\n\n\n<li><strong>Porosity:<\/strong>\u00a0small scattered pores within the code limits are acceptable; cluster porosity, wormholes, and surface porosity above the limits are not.<\/li>\n\n\n\n<li><strong>Entrapped slag:<\/strong>\u00a0limited by size relative to wall thickness; inclusions that reduce the effective wall below design are rejectable.<\/li>\n\n\n\n<li><strong>Fusion failures and unfilled roots:<\/strong>\u00a0rejectable in girth welds because both act as planar stress raisers at the root and sidewall.<\/li>\n\n\n\n<li><strong>Undercut:<\/strong>\u00a0acceptable up to 1\/32 in (0.8 mm) deep where the remaining wall meets design; deeper grooves are repaired.<\/li>\n\n\n\n<li><strong>Spatter and arc strikes:<\/strong>\u00a0cosmetic; cleaned per project spec, not a structural acceptance item.<\/li>\n<\/ul>\n\n\n\n<p>The practical rule we give every inspector and welder: when in doubt, the indication is measured against the code table, not argued about on site. Our NDT interpreters mark every indication against the acceptance criteria in the inspection procedure, and the weld book records the disposition, so an accepted weld is accepted on paper, not on memory.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-are-defective-pipeline-welds-repaired\">How Are Defective Pipeline Welds Repaired?<\/h2>\n\n\n\n<p>Defective pipeline welds are repaired in two ways, depending on the defect. Surface defects such as toe grooves, spatter, and shallow surface porosity are ground and blended to a smooth contour and verified with MT or penetrant testing. Volumetric and planar defects require removing the complete defect, which usually means cutting out the weld and re-welding the joint.<\/p>\n\n\n\n<p>For a cut-out, the weld is removed with a&nbsp;pipeline cutting machine&nbsp;to a clean bevel, the area is cleaned and inspected to confirm the defect is gone, and the joint is re-welded with the same qualified procedure as the original weld. The weld repair is then inspected 100% with the same non-destructive testing methods and acceptance criteria as the original, because a repair weld is a new weld with all the same risks.<\/p>\n\n\n\n<p>A weld repair is a second thermal cycle on already-cycled material, which is why cold cracking risk rises on repaired high-strength joints and why low-hydrogen consumables and delayed inspection apply to the repair exactly as they did to the original weld. In our&nbsp;pipeline repair&nbsp;work, the failures we see are almost always from cutting out only the visible indication and re-welding over the hidden defect. Cutting out the complete defect, verifying removal, and re-inspecting 100% is not optional; it is the repair. Where a weld cannot be repaired in place, our crews can rehabilitate or replace the affected section using&nbsp;trenchless pipeline repair&nbsp;methods.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-frequently-asked-questions\">\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-is-the-most-common-pipeline-welding-defect\">What is the most common pipeline welding defect?<\/h3>\n\n\n\n<p>The most common types of welding defects in pipelines are porosity and entrapped slag. Both come from contamination and cleaning gaps rather than difficult welding conditions, and both are prevented with clean bevels, dry consumables, and thorough interpass cleaning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-causes-porosity-in-pipeline-welding\">What causes porosity in pipeline welding?<\/h3>\n\n\n\n<p>Porosity in pipeline welding is caused by gas trapped in the solidifying weld metal. The gas comes from moisture, rust, oil, or paint on the bevel, damp electrode coatings, shielding gas lost to wind, hose leaks, or travel speeds so fast that the pool freezes before the gas escapes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-is-the-difference-between-lack-of-fusion-and-incomplete-penetration\">What is the difference between lack of fusion and incomplete penetration?<\/h3>\n\n\n\n<p>Fusion failure is the failure of weld metal to bond with the base metal or a previous pass, usually at the sidewall or interpass boundary. An unfilled root leaves the root faces unjoined; both are planar, stress-raising defects and both are rejectable in girth welds.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-are-cracks-ever-acceptable-in-pipeline-welds\">Are cracks ever acceptable in pipeline welds?<\/h3>\n\n\n\n<p>No. Any crack in a pipeline girth weld is rejectable regardless of size or location, and because cracks grow in service, the standard response is complete removal of the cracked weld and re-welding, not acceptance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-how-much-undercut-is-allowed-in-a-pipeline-weld\">How much undercut is allowed in a pipeline weld?<\/h3>\n\n\n\n<p>The code permits a toe groove up to 1\/32 in (0.8 mm) deep where the remaining wall still meets the design thickness. Deeper grooves are repaired by grinding and blending, or by weld build-up followed by re-inspection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-is-the-best-ndt-method-for-pipeline-girth-welds\">What is the best NDT method for pipeline girth welds?<\/h3>\n\n\n\n<p>No single method is best; the combination matters. Radiographic testing or ultrasonic testing verifies volumetric soundness, phased array is superior for planar defects, and MT finds toe cracks on the surface. See our&nbsp;pipeline welding inspection checklist&nbsp;for hold times and acceptance rules.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-can-a-defective-pipeline-weld-be-repaired\">Can a defective pipeline weld be repaired?<\/h3>\n\n\n\n<p>Yes. Surface defects are ground and blended; volumetric and planar defects are cut out completely and re-welded with the qualified procedure. Every weld repair is re-inspected 100% with the same NDT methods and acceptance criteria as the original weld.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-does-automatic-welding-eliminate-welding-defects\">Does automatic welding eliminate welding defects?<\/h3>\n\n\n\n<p>No, but it removes the human variables behind most of them: automatic pipeline welding holds travel speed, arc length, and weave within tight tolerances and logs the parameters. The WPS, consumable control, cleaning, and inspection still govern the result.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-is-the-difference-between-porosity-and-slag-inclusion\">What is the difference between porosity and slag inclusion?<\/h3>\n\n\n\n<p>Porosity is gas trapped in the solidifying weld metal as round or elongated cavities, while slag inclusion is non-metallic flux residue trapped inside the weld or between passes. Porosity comes from contamination and damp consumables; slag comes from incomplete interpass cleaning and low current.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-how-long-should-you-wait-before-ndt-after-welding\">How long should you wait before NDT after welding?<\/h3>\n\n\n\n<p>Hold high-risk girth welds for 48 hours before final non-destructive testing, because hydrogen-induced cracking is delayed and can appear days after welding. The 48-hour hold is a standard project-specification requirement for joints exposed to hydrogen risk.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-where-do-pipeline-welding-acceptance-criteria-come-from\">Where do pipeline welding acceptance criteria come from?<\/h3>\n\n\n\n<p>Acceptance criteria come from the code named in the contract, usually API 1104 Section 9 for cross-country pipelines, with ASME B31.4 and B31.8 for transmission systems. The project specification adds requirements on top of the code, and every indication is measured against the code tables rather than judged by eye.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-do-automatic-and-manual-welding-differ-in-defect-repair-rates\">Do automatic and manual welding differ in defect repair rates?<\/h3>\n\n\n\n<p>Automatic pipeline welding produces more consistent fusion and fewer toe defects because it removes the human variables of travel speed, arc length, and weave width. Manual welding keeps the advantage in tight positions, but its repair rates depend on welder skill and qualification, so the procedure and the inspection still decide the outcome.<\/p>\n\n\n\n<p><strong>Unsure which defects are hiding in your girth welds?<\/strong>&nbsp;Send us your pipe grade, wall thickness, welding process, and NDT results. Our welding engineers will review the defect pattern and confirm the prevention measures within 24 hours.<\/p>\n\n\n\n<p>Most welding defects in pipelines are preventable.&nbsp;The system that eliminates the majority of field rejections is a chain of controlled inputs: clean joints, dry consumables, a qualified procedure held inside its parameter window, controlled technique, controlled environment, and inspection that feeds back into the process. Porosity and entrapped slag come from contamination and cleaning; fusion failures and unfilled roots come from parameters and technique; cracks come from stress, hydrogen, and restraint. Each family has a known cause, a known prevention, and a known detection method, and none of them survives a disciplined system for long.<\/p>\n\n\n\n<p>In our pipeline construction, repair, and maintenance work, the joints that fail are almost always the ones where a control was skipped: a damp rod, a rained-on bevel, a fit-up that drifted, or an inspection that was rushed. The weld that passes the system is the weld that passes the years.<\/p>\n\n\n\n<p>If you are planning pipeline construction,&nbsp;pipeline maintenance, repair, hot tapping, or line stopping, work with a team that treats defect prevention as routine. JSW has completed&nbsp;more than 1,200 hot tap and line stopping jobs&nbsp;and hundreds of pipeline girth weld programs across Asia, the Middle East, Africa, and South America, with welder and procedure qualifications to&nbsp;API 1104 and ASME B31.4\/B31.8, backed by our own line of hot tapping machines,&nbsp;line stopping plugs, and pipeline cutting machines.<\/p>\n\n\n\n<p>Where a line is beyond repair, our crews so handle trenchless pipeline repair, horizontal directional drilling, and microtunneling for replacement crossings. Send us your pipe grade, wall thickness, welding process, and service, and our engineers will confirm the defect prevention and inspection measures for your job and provide a quotation, usually\u00a0within 24 hours<\/p>","protected":false},"excerpt":{"rendered":"<p>Pipeline welding defects&nbsp;are the discontinuities that make a girth weld fail acceptance or leak in service, and the most common ones are porosity, slag inclusion, lack of fusion, incomplete penetration, and weld cracking. You prevent them by qualifying your welding procedure, controlling consumable storage and joint cleanliness, welding inside the qualified parameter window, and verifying 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