对8 mm厚7075-T651铝合金轧制板进行了搅拌摩擦焊接,重点研究了焊后热处理工艺和背部二次焊接对接头性能的影响.结果表明,焊接态接头致密没有缺陷,接头强度约为母材的71%.T6热处理后,焊核区出现由锯齿形裂纹和微孔组成的"S"线.随着固溶温度升高,"S"线愈加明显,并伴有晶粒异常长大现象.T6热处理后,接头硬度恢复到母材水平,但强度和延伸率显著下降,这是由于裂纹沿"S"线产生和扩展所致.在焊态样品背面进行二次焊接,可明显改善接头的力学性能.
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