In　this　letter,　the　addition　of　the　transverse　arc　into　high-power　fiber　welding　is　proposed.　The　effects　of　the　transverse　arc　on　the　laser-induced　plume,　the　morphology　of　the　weld,　and　the　stability　of　the　welding　process　are　investigated.　The　experimental　results　indicate　that,　by　introducing　the　transverse　arc,　the　slender　plume　disappears,　the　temperature　of　the　plasma　plume　increases　then　decreases　with　the　rise　in　height,　the　weld　width　is　reduced　by　around　42%,　and　the　weld　depth　and　the　melting　area　are　enhanced　by　about　28　and　12%,　respectively.　Moreover,　the　stability　of　the　welding　process　is　improved　remarkably.　As　concluded　from　further　analysis,　the　Mie　scattering　of　the　incident　laser,　induced　by　the　particles　in　the　plume,　is　responsible　for　the　adverse　effects　induced　by　the　plume.　With　the　addition　of　the　transverse　arc,　the　particles　in　the　plume　are　gasified　and,　thus,　do　not　impact　the　energy　transmission　of　the　fiber　laser.　Consequently,　the　adverse　effects　induced　by　the　plume　can　be　significantly　suppressed　while　the　laser　energy　utilization　efficiency　and　the　stability　of　the　welding　process　are　improved.