How to choose the welding method for pressure pipelines?
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When do welders use manual arc welding? When should TIG welding be used for the root pass and manual welding for the finish pass?
Shouldn’t you have welding techniques?
Refer to standard 50236. Generally, the design will specify requirements regarding welding, but whether TIG welding is needed for backing is not always necessary; the key factor is whether the weld can pass inspection. It is very difficult to pass inspections on welds that do not have a backing layer.
Thank you. It seems that according to the specifications, several welding methods can be used for carbon steel pipes; I couldn’t find information on how to choose among them
Yes, several welding methods can be used, as long as you have a welding procedure qualification that meets the specified requirements.
We laypeople really don’t know about this; we’re not sure how to choose. Let’s wait for the answers from other sea travelers
The welding method used is related to your inspection criteria. Of course, if your welders are highly skilled, manual welding can work as well and it can also help save costs; no one will interfere with that. If their skills are average and there’s a risk of failing the inspections, then using TIG welding might be a good option
If it is a pressure pipeline. . . Welding is the fundamental task in working with pressure pipelines. . . I don’t know which welding method you’ve chosen. . Your unit is unqualified. .
I took a look at the design drawings here; there is no requirement for TIG welding as a base layer for the chlorine pipes