串联焊接 series welding

串联缝焊 series seam welding

串联弧焊 [机] series arc welding

串联电弧焊接 series-arc welding

双头串联电弧自焊机 twin-head tandem arc-welding machine

串联多弧焊 tandemsequence

横列双丝串联埋弧焊 series submerged arc welding