5052铝合金薄板搅拌摩擦焊工艺

Friction stir welding procedure of 5052 aluminum alloy thin plate

针对5052-H34铝合金薄板进行了搅拌摩擦焊工艺试验,分析了工艺参数对接头表面成形的影响,测试了接头的力学性能。研究表明,搅拌头转速达到1 600 r/min以上时,能够获得成形美观的接头;在搅拌头转速ω和焊接速度v较低时,随着ω/v值的增加,接头外观成形逐渐得到改善。接头力学性能测试结果显示,接头断裂在焊缝中心,在序号7参数下获得的接头平均抗拉强度(212.6 MPa),达到母材强度(261.1 MPa)的81.4%;平均断后伸长率(19.05%)是母材(14.01%)的1.36倍;在正弯角和背弯角达到180°时均无开裂。

Friction stir welding procedure of 5052-H34 aluminum alloy thin plate was carried out successfully.The effect of welding parameters on the surface appearance of the joint was analyzed and the mechanical properties of the joint were tested.The results show that the good surface appearance of the joint is obtained at the tool rotation speed(ω) of 1 600 r/min.At the low tool rotation speed(ω) and the low welding speed(v),the increasing of the ratio of ω/v can improve the surface appearance of the joint.The fracture occurs at the weld center line,which is the weakest zone of the joint.The mean tensile strength can reach 212.6 MPa,and be up to 81.4% of the base material(261.1 MPa),and the mean elongation after fracture is 19.05%,be up to 136% of the base material(14.01%).No cracking is found in the joint at the 180° face bending test and 180° back bending test.