back-chipped /underside(关于焊接)? 原帖由 echommm 于 2008-9-13 19:49 发表 purging gas argon - purges on the underside of the welds shall be maintained for all weld passes. 焊缝下面 ............... underside of joint during welding 焊接时接头下面 double sided groove j ... agree! 因为保护气体是向上走的,so...查看更多