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发表于 2015-11-23 13:09:04
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本帖最后由 inconel 于 2015-11-23 13:12 编辑
If API RP 582 standard is applicable in your job,
7.5 Whenever a back purging gas is selected to prevent oxidation or scale formation on the underside of the weld, the purge shall be maintained until at least 1/4 in. (6.5 mm) depth of weld metal has been deposited.
7.6 For socket, seal, and any other attachment welds on base materials less than 1/4 in. thick, the back purging shall be maintained throughout the welding operation.
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