series spot welding
series seam welding 串联缝焊；单边多极滚焊；单边双电极焊缝；单面多极滚焊 series spot welding 串点焊；串联点焊；单边多极点焊；单面点焊；单面多点点焊；连续点焊 series submerged arc welding (SAW-S)横列双丝串联埋弧焊 ..
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