一个关于焊接上的单词？ stainless steel, monel, and inconel welded to each other or to carbon steel: for schedules 5 and 10, only gtaw shall be used for the root bead and the balance of the weld. for heavier piping, the root bead shall be made with gtaw; the balance of the weld may be made using another air products-approved welding process. all welding shall be made using an internal gas purge of either argon or nitrogen gas. the use of backing rings is not permitted except for final closure welds when approved by the purchaser’s representative on a case-by-case basis. final closure welds are those welds where prefabricated piping is installed to a fixed component in the piping system resulting in positional welding where the ability to obtain a uniform root pass is impaired and/or extensive purging would be required to weld successfully. typically, these should be less than approximately 15% of the total number of welds. locations where backing rings have had to be used must be recorded in the construction records. 这就是整段话，各位麻烦您们帮我看看。查看更多
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