Effect of materials on the forming characteristics of laser-MIG hybrid welding process with filler wire for aluminum alloy

In this study,the test subjects included the aluminum alloys 2A14 and 5A06,as well as the welding wires ER2319 and ER5356,single laser welding,laser welding with filler wire,laser metal inert gas(laser-MIG)hybrid welding and laser-MIG hybrid welding with filler wire were carried out respectively to research the influence of aluminum alloy base material and welding wire on weld forming charac-teristics.The results show that:under the same test conditions,the penetration of the base material 5A06 is greater than that of 2A14,the maximum is about 51.3%,and the penetration filling ER5356 is greater than that of ER2319,the maximum is about 32.2%;for 2A14 alu-minum alloy,the penetration is basically unchanged after filling with ER5356,and there is a relatively large decrease after filling ER2319,the maximum is about 21.2%;for 5A06 aluminum alloy,the penetration decreases after filling both kinds of welding wire,the penetration achieved with filler wire ER2319 is lower than that of ER5356.At the same time,through the process of laser absorption in different metal materials,it was found that the differences in material composition led to different laser absorption rates,resulting in different energy utiliza-tion,which is an important reason for the correlation between aluminum alloy materials and laser-MIG hybrid welding with filler wire.

Forming characteristics of triple-wire gas indirect arc surfacing

Based on the advantages of triple-wire gas indirect arc welding(TW-GIA),such as small heat input,low dilution rate,and high deposition rate,the surfacing test on Q345 steel was carried out,and the surfacing forming characteristics of TW-GIA were studied.Results showed that due to excessive wetting angle of the weld and the limitation of the heat source mode,there was unfused defect between the weld toes of the adjacent welds.To improve the morphology of the surfacing layer,the inclined substrate surfacing process was used.As the inclination angle increases,the size of unfused defect between adjacent welds gradually decreases.When the angle of inclination is in-creased to 30°-40°,the single-layer multi-pass surfacing layer with uniform forming and available fusion between welds can be achieved.Compared with tandem double-wire arc(T-DW)surfacing,the deposition rate of TW-GIA increased by 61.49%,while the dilution rate of the base metal decreased by 71.91%.The surfacing method has the advantages of a high deposition rate and low heat input,which is benefi-cial to improve the microstructure of the surfacing layer,making the coarse columnar crystals smaller,and improving the microhardness.The average microhardness level is 233.1 HV,which is higher than the average microhardness of the T-DW surfacing layer 220.4 HV.