7055铝合金搅拌摩擦焊工艺

Friction stir welding process parameters of 7055 aluminum alloy

利用正交试验法研究搅拌摩擦焊工艺参数对4 mm厚7055-T6铝合金对接接头力学性能和显微组织的影响。结果表明:焊接速度对接头抗拉强度影响最大,旋转速度和压入量依次减小;最优参数焊接的试样的抗拉强度为475.5 MPa,接头强度系数0.788;焊缝的显微硬度低于母材,呈"W型"分布;在正弯角约75.4°和背弯角约62.1°时出现开裂。

The effects of friction stir welding process parameters on the mechanical properlies and microstructure of 4 mm thick 7055-T6 ahnninum alloy were studied by adopting orthogonal test method. The resuhs show that the effect of welding speed on the lensile strength is maximal,then the rotational st）eed and heel plunge depth. By using the optimal parameters,the tensile strength of the sample is up to 475.5 MPa,and the joint coefficient of strength is up to 0.788, The mi（.rohardness of weld, which is ＂W＂ distribution,is lower than the base material. At about 75.4° face bending test and 62.1° back bending test,the cracking is found in the joint.