Welding of pipes is commonplace. Pipes are used for transporting oil, water, gas, etc. The pressure inside the pipe may range from a vacuum pressure to gage pressure running into several hundreds of pounds per square inch. For such joints, mechanical joints such as rivets, threaded joints, etc. are not adequate for the purpose, hence … Read more
This article explores a few aspects around the concept of welding procedure qualification on a pipe test coupon. Is the full circumference of pipe necessary for qualifying the procedure? Does the answer change if we are talking about a welding performance qualification? Consider the following question asked in Interpretation IX-19-11. “Question: A groove weld procedure … Read more
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 … Read more
Pipe welding positions are dictated by the job. Pipe welds are made under many different requirements and in different welding situations. In general, the position is fixed, but in some cases can be rolled for flat-position work. Positions and procedures for welding pipes are outlined below. Horizontal pipe rolled Weld(1) Align the joint and tack weld or … Read more
Pipe Welding : General The most commonly used processes for joining pipes are the manual oxyacetylene process and manual shielded metal-arc process. Automatic and semiautomatic submerged arc, inert gas metal-arc, and atomic hydrogen welding are also used. particularly in shop operations. The manual shielded metal-arc process may be used for welding all metals used in … Read more