Weldan.韦尔达weldv.焊接；使结合n.焊接；焊缝welding jig焊接夹具welded frog焊接辙叉welded seam焊缝,熔接缝welded mesh焊接网weld crater熔池welded unit焊接构件welded case焊接机匣weld period焊接时间weld strain焊接应变welded pipe焊管,焊接管,焊制管