To　achieve　the　heat　and　mass　transfer　decoupling　proposed　bypass　coupling　arc　welding　process　(Arcing-wire　PAW).　First　introduced　the　bypass　coupling　arc　welding　process-Arcing-wire　PAW　principle　and　system　components,　data　synchronize　acquisition　systems　and　the　high-speed　cameras　were　used　to　record　the　changes　of　droplet　transfer,　combined　with　changes　in　electrical　signals　and　droplet　transfer　behavior　of　different　welding　parameters　on　droplet　transfer.　The　results　showed　that　the　changes　of　MIG　wire　feed　speed　and　MIG　current　all　change　the　wire　melting　equilibrium　position,　so　that　the　droplet　transition　state　and　the　frequency　changes,　in　addition,　the　changes　in　the　height　of　the　vertical　wire　can　make　full　use　of　the　heat　bath　to　achieve　stable　and　rapid　transition.　Because　of　heat　and　mass　transfer　can　be　controlled　separately　and　arc　shape　is　elongated　in　the　direction　of　welding,　ensuring　high-speed　welding　and　weld　stability　of　the　welding　process.　©　2017,　Editorial　Board　of　Transactions　of　the　China　Welding　Institution,　Magazine　Agency　Welding.　All　right　reserved.