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研究了硬对软（ＣＳ）、软对硬（ＣＨ）和软硬中（ＳＨＭ）三种典型的力学性能非对称焊接接头疲劳裂纹扩展规律．结果表明：力学性能非对称性对焊接接头的疲劳裂纹扩展规律有很大影响．起始裂纹在软区的硬对软力学性能非对称焊接接头，起始裂纹越靠近硬区，疲劳裂纹扩展速率越快；起始裂纹在硬区的软对硬力学性能非对称焊接接头，起始裂纹越靠近软区，疲劳裂纹扩展速率越慢；起始裂纹在硬区的软硬中力学性能非对称焊接接头，硬夹层宽度越窄，疲劳裂纹扩展速率越慢．
The fatigue crack propagation of three typical asymmetric welded joints with hard to soft (CS), soft to hard (CH) and soft to hard (SHM) was studied. The results show that the asymmetry of mechanical properties has a great influence on the fatigue crack propagation law of welded joints. Initial crack in the soft zone of the soft mechanical properties of non-symmetrical welded joints, the initial crack closer to the hard area, the faster the fatigue crack growth rate; initial crack in the hard area of the soft-to-mechanical properties of asymmetric welded joints, The closer the initial crack is to the soft zone, the slower the fatigue crack growth rate. The initial crack is in the soft and hard mechanical properties of the hard zone. Asymmetrical welded joints, the narrower the width of the hard interlayer, the slower the fatigue crack growth rate.