The Research On New Activating Flux Of A-TIG Welding Of Magnesium Alloy

In this work, simple and low-cost method of TIG welding were used to AZ31B magnesium alloy coated with an active agent for welding. First, select the single metal oxides and rare earth oxides ?TiO₂, CaO, Al₂O₃, Cr₂O₃, MgO, MnO₂, Nd₂O₃, Y₂O₃, La₂O₃, CeO₂? as an active agent, study the influence of coated with different active agents for the appearance of welded joints forming, deep width ratio, microstructure, micro-hardness, tensile properties. Then by selecting the better active agent ?Al₂O₃, MgO, Nd₂O₃, Y₂O₃?, using the uniform design method for formulation design and make organizational performance analysis to get the best magnesium alloy A-TIG welding active agent formulation.The results show that under the 100A welding current,340mm-min-1 welding rate,9L-min-1 Argon gas flow rate and 3mm tungsten length process parameters gets the best welding effect; detect welded joints coating with TiO₂, CeO₂, With the increase of the amount of coating, penetration of the two active agents decrease after increase, when the coating amount is 3.0mg·cm-2, it reaches its largest penetration depth; Al₂O₃?MgO?Nd₂O₃?Y₂O₃, these four penetration of active agent welded joint are relatively large, mechanical properties are relatively good; Compared with single agent coating microstructure of welded joints, the welded joint coating with composite active agent is obviously refined, its penetration and micro-hardness is greater than the single agent coating welded joints. The best formula is Y₂O₃?Nd₂O₃?Al₂O₃? MgO. Content percentage is 17.28%?7.24%?52.8%?22.68%. Aspect ratio is 0.425.