{"id":761,"date":"2021-12-28T02:08:08","date_gmt":"2021-12-28T02:08:08","guid":{"rendered":"https:\/\/mewelding.com\/?p=761"},"modified":"2023-04-09T01:16:31","modified_gmt":"2023-04-09T01:16:31","slug":"welder-qualification-for-pipe-welding","status":"publish","type":"post","link":"https:\/\/mewelding.com\/welder-qualification-for-pipe-welding\/","title":{"rendered":"Welder Qualification For Pipe Welding"},"content":{"rendered":"\n
When the production welding involves a lot of welding of pipes, it is best to qualify your welder on a pipe test coupon. Although, welder qualification for pipe welding need not be necessarily be done on a pipe; a welder qualified on a plate is qualified to weld on pipes too, with some restrictions, as described later in this article. <\/p>\n\n\n\n In this article, we will discuss the pipe diameter \u2013 which is an essential variable for welder performance qualification<\/a>. In the latter half of the article, some interesting questions surrounding the issue of welder qualification for pipe welding have been discussed.<\/p>\n\n\n\n If you have a lot of pipe welding going on in my shop, what diameter should you choose for the test coupon for qualifying your welder in accordance with Section IX? What is the range<\/em> of qualified pipe diameters once a welder has been qualified on a pipe of certain OD?<\/strong><\/p>\n\n\n\n The following paragraphs will answer these questions.<\/p>\n\n\n\n When it is required to qualify a welder for pipe welding, the outer diameter of the pipe is an essential variable that needs to be taken care of. Pipe diameter appears as an essential variable for most of the processes under QW 350, and it has been defined in QW 403.16.<\/p>\n\n\n\n QW 403.16 points us to QW 452.3, which lists the qualified range of pipe diameters on which he is qualified to weld on in production welding.<\/p>\n\n\n\n Per QW 452.3, a welder qualified with any pipe of OD 2-7\/8 inches (73 mm) or above, is qualified for welding on ALL pipes of OD 2-7\/8 inches (73 mm) and above (Interpretation IX-80-61 is contextual here). <\/p>\n\n\n\n This welder cannot weld on pipes of OD less than 2-7\/8 inches (73 mm). [Interpretation IX-83-155 tells us that this welder cannot weld on pipes of OD < 2-7\/8 inches (73 mm) even if the joint is a partial penetration joint].<\/p>\n\n\n\n Further, a welder qualified with any pipe of OD between 1 inch (25 mm) to 2-7\/8 inches (73 mm), is qualified for welding on ALL pipes of OD 1 inch (25 mm) and above.<\/p>\n\n\n\n Also, a welder qualified with any pipe of OD less than 1 inch (25 mm), is qualified for welding on ALL pipes of OD equalling the OD of the test coupon, and above.<\/p>\n\n\n\n The range of qualified diameters for welding performance qualification is summarised below:<\/p>\n\n\n\nPipe Diameter<\/strong><\/h2>\n\n\n\n