inert gas backing 中文意思是什麼
inert gas backing
解釋
惰性氣體襯墊-
The pqr shall include the composition and flow rate of the shielding and inert gas backing, when used
焊接工藝評定記錄單上應包括封底焊時所用的惰性保護氣體組成成分和流率。
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