controlled tungsten-arc welding自动控制弧长的钨极电弧焊 controlled-transfer welding可控过渡电弧焊 convex fillet welding凸面角焊缝 convex fillet weld凸角焊缝; 凸形角焊缝 copper-alloy arc welding electrode铜合金焊条 copper-aluminum welding ...