Utilizing the low power pulsed laser + TIG hybrid welding on the 2 mm thick stainless steel surfacing welding

investigated the pulsed laser influences on the arc behavior

the weld pool behavior and the weld geometry. The results show that expansion occurs at the center of the arc

and the arc anode is stabilized at the laser spots with the TIG voltage rising slightly at the same time when the pulsed laser acts on arc. In the maintenance phase of the pulsed laser

the molten pool liquid metal flow backwards

the length of molten pool increase significantly. After the pulsed laser disappeared 1 millisecond

the length of molten pool begin to decrease

2 millisecond later the liquid metal reflux forward

resulting in the weld surface formed fish-scale pattern

improved the weld surface. The weld penetration of the hybrid welding is 1.77 times than that of TIG welding and 2.6 times than that of the laser weld

and the speed of hybrid welding can be improved by 50% compared with TIG welding under the same penetration.