短語詞組短語overhead d welding 仰銲overhead fillet welding 仰角銲overhead positions welding 仰銲仰銲overhead position welding 仰銲;氧銲;仰臉銲horizontal overhead position welding 仰角銲overhead welding seam 仰銲縫overhead position of welding 仰銲位置welding in overhead position 仰銲 返回 overhead welding