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研究了厚度为5 mm的AZ31镁合金板的钨极氩弧焊焊接性能,分析了焊接速度对焊缝微观组织和拉伸强度的影响。结果表明,AZ3镁合金TIG焊焊接热输入随着焊接速度的降低而增大,加大了焊缝熔深和熔宽,有效提高了接头的力学性能。随着焊接速度降低至70 mm/min,过大热输入导致了熔合区晶粒的粗化,并且增大了第二相(β-Mg17Al12)的尺寸与体积分数,降低了接头强度。
The welding performance of AZ31 magnesium alloy plate with thickness of 5 mm was studied. The effect of welding speed on the microstructure and tensile strength of the weld was analyzed. The results show that the welding heat input of AZ31 magnesium alloy TIG welding increases with the decrease of welding speed and increases the weld penetration and weld width, which effectively improves the mechanical properties of the joint. As the welding speed is reduced to 70 mm / min, excessive heat input leads to the coarsening of grains in the fusion zone and enlarges the size and volume fraction of the second phase (β-Mg17Al12), reducing the joint strength.