The hydrogen gas tightness has been achieved at 80 kilograms, but small sand holes were found in the welds. Do any of you have experience with this issue? How can it be resolved? Thank you
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The same question as before, thank you all.
After pressure relief and displacement, the area is ground open with a angle grinder and then rewelded using TIG welding
It needs to be repaired. Your suggestion is correct
Small sand holes were found in the weld; pressure was released and further treatment was carried out
The testing should be stopped, and a third party should be hired to check whether the non-destructive testing has been falsified. The high-pressure hydrogen pipeline must be 100% perfect; how could there be sand holes in it? If the RT is fine, the welding process needs to be checked.
Pressure relief and replacement; after passing the inspection, the weld is ground and rewelded~!
Pressure relief and replacement; once the inspection is successful, the welds are thoroughly treated! ! ! ! ! ! ! ! ! ! ! ! ! ! !
Pressure relief, qualification of the replacement material, dehydrogenation heat treatment, grinding, PT testing, welding, post-weld heat treatment, radiographic testing, hardness testing
After pressure release, perform RT testing again; even if the non-destructive testing shows no defects, I think it’s still necessary to grind the area and then weld it again – it’s visible to the naked eye
Pressure relief, nitrogen purging, grinding, welding
Check the radiography data and hydrostatic test records. If it’s only this one weld joint that has a problem, that’s manageable – it can be repaired. The key is to check the quality of your other weld joints. High-pressure hydrogen is not something to play around with