Research On Laser Welding Characeristics Of Aluminum With Arc Auxiliary Melting Wire

In this paper, a laser welding with arc auxiliary melted wire and let the wire in theform of liquid filling process was developed to solve the problems such as highrequested accuracy of alignment between laser beam and wire, large fluctuation of laserenergy, and unstable keyhole created by filling solid wire in the process of traditionallaser welding with filling solid-state wire. The laser welding characteristics ofaluminium alloy with arc auxiliary melted wire, and the main process parametersaffecting stability of arc auxiliary melting wire are studied. For different wire meltingstate, take proposed two transition control method: strict control of the distance betweenfilling wire and the axis of laser beam and capillary provided by assembling gap.Meanwhile, its physical characteristics distinction between traditional laser weldingwith filler wire welding, the law of welding speed on the physical characteristics of bothand the laser welding characteristics of aluminum with arc auxiliary melted filler wireare researched as well.Firstly, the wire melted stable procedure test, the effect law of melting wire energyand the location of the filler wire on the wire melting are carried out. Throught analyzedthe liquid wire transfer behavior result out the welding current, the distance betweenfilling wire and the laser beam, angle and way of filler wire are the main factorsaffecting the wire melting state. Before the wire feeding with less than30°compared tothe after the wire feeding is stable, what’s more, The optimized welding intervals are asfollows: the distance between laser beam and filling wire is-1~6mm, distance betweenheat sources is4mm, two kinds of method are put forward to control the liquid fillingmaterial stable transfer through the stress analysis;Secondly, throught processed and analysised high-speed camera and CCD image,comparative study of physical characteristics of wire pool,keyhole,plasma ect in laserwelding with arc auxiliary melted wire and traditional laser welding with filler wire.The distance between filling wire and the center of the keyhole and the average size ofkeyhole in the laser welding with arc auxiliary melted filler wire were farther and largerthan those of the traditional filling solid wire process, respectively, which avoided thedirect impact of fill material to the keyhole, and the large size laser pool, long liquid residence time in favor of gas and other impurities surfaced. And then, the stability ofplasma are improved, the accuracy requirements for wire feed are reduced, and weldformed good in high-speed welding;At last, the laser welding characteristics of aluminum with arc auxiliary meltedfiller wire are studied and found that under2m/min welding speed greatly decreased theporosity of aluminum alloy welding and more than4m/min welding speed welding beadalmost no pores.adapted to a certain assembly clearance, high-speed welding, as wellas thick plate penetration capability,and decreased the wire feed accuracy requirements.