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以4 mm厚6061-T6铝合金轧制板材为研究对象,通过改变焊接线能量与送丝速度,研究了不同工艺参数下接头的显微组织和力学性能。结果表明,HAZ宽度和熔合区晶粒大小随线能量的增大而增大;当线能量为297 J/mm时焊接接头的抗拉强度为213 MPa,达到母材强度的73%。熔宽对送丝速度的变化较余高和熔深更敏感,送丝速度位于7.4~8.2 m/min范围内时,焊缝成形较好;在送丝速度为8.3 m/min时获得最大的抗拉强度239 MPa。断裂发生在热影响区,属于韧性断裂,表明热影响区为焊接接头最薄弱的位置。
Taking 4 mm thick 6061-T6 aluminum alloy rolled plate as the research object, the microstructure and mechanical properties of the joint under different technological parameters were studied by changing the welding wire energy and wire feeding speed. The results show that the width of the HAZ and the grain size of the fusion zone increase with the increase of the line energy. When the line energy is 297 J / mm, the tensile strength of the welded joint is 213 MPa, reaching 73% of the base metal strength. The change of melt width is more sensitive to the change of wire feeding speed than that of the remaining height and penetration. When the wire feeding speed is in the range of 7.4-8.2 m / min, the weld formation is better. When the wire feeding speed is 8.3 m / min, the maximum Tensile strength 239 MPa. Fractures occur in the HAZ, which are ductile faults, indicating that the HAZ is the weakest point for welded joints.