平头对接焊缝 square butt weld ; plain butt weld

平边对接焊缝 plain butt weld

平头开口对接焊缝 open square butt weld

TIG平板对接焊 TIG butt-welding

对接平焊 butt-weld in the downhand position

平板对接焊 butt plates welding

平头开口对接焊 open square butt welding

平焊对接接头 downhand butt joint