无坡口对接焊 plain butt weld ; square butt welding

无坡口对接接头 straight butt weld

无坡口接头 unchamfered joint

无坡口留隙对接 open square butt joint

无坡口焊接 square grooved welding

无坡口槽焊 [机] square-groove weld ; square groove weld

无坡口对于接焊 plain butt weld