first pass,sound weld metal 请教在句中什么意思? on plate test coupons which are vertically welded, the first pass may be run downwards,provided that it has been completely removed to sound weld metal in the preparation for welding the second side 立焊的焊接试板,打底焊应自上往下进行的焊接,只要在准备焊接第二面之前,已将那一面清理成良好的焊缝金属。 正好这几天,我也在翻译焊接方面的资料,相互帮助一下!查看更多