Research on Laser-MIG Hybrid Fillet Weld Forming Process
At present,the research of hybrid welding technology is mostly focused on thin plate splicing welding,and the welding of fillet weld still uses single heat source,the weld forming effect is poor.Aiming at the fillet weld of 8 mm thick Q235 low carbon steel plate,the effects of various process parameters on the forming sizes of the fillet weld and weld pool state during laser-MIG hybrid welding were studied.The results show that the splatter of the MIG arc welding melting pool is large,and the penetration and weld width are small.After adding the laser heat source,the laser has a certain stable effect on the arc,the penetration and weld width increase,and the reinforcement decreases.The size of the arc welding melting pool increases with the current increasing.When the laser melting pool and the arc welding melting pool are well coupled,it is conducive to stabilize the melting pool and reduce the spatter.With the increase of heat source spacing,the droplet no longer drips into the laser action area,and the coulpling effect decreases.With the increase of welding speed,the action time of heat source in unit length weld becomes shorter,and the penetration and weld width decrease.When the laser power is 1.5 kW,the current is 220 A,heat source spacing is 2 mm,the welding speed is 600 mm/min,the coupling between the two molten pools is good,the weld pool is the most stable,and the weld forming is the best.
laser-MIG hybrid weldingfillet weldweld formationstate of weld pool
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