High pressure pipeline welding
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When welding between high-pressure pipelines and pipelines, are there any requirements for the weld gap? The bottom layer argon arc welding we use here requires the width not to be greater than 150mm?
High-pressure pipeline welding must use argon arc welding as the base according to regulations. The size of the butt weld is required to be 1±1mm, and the width of the weld is required to exceed the edge of the groove by 2mm on each side.
So do instrument gas pipelines also require argon arc welding to be primed? Also, what situations generally require argon arc welding primer?
It seems that there is no requirement in the standard to use sub-arc welding for primer. The use of argon arc welding for primer may just make the weld easier to pass during non-destructive testing. The use of argon arc welding is relatively clean, and it is easy to control the welding joint to penetrate the welding joint during welding. It is not easy to leave foreign matter on the inner wall of the pipe and affect the filming.