projection welded cap凸: bulge; protrude焊帽: weld cap凸焊: beading weld; projection welding; projectionwelding; relief welding电焊帽: welding helmet凸焊道: convex bead下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:凸焊帽，即可在微信中查询翻译
