通过采用45#钢基体材料,在不预热情况下增加过渡合金熔覆层,再选用专用的高硬度焊丝进行堆焊实验;由于所加的合金元素改变了激光熔覆层内奥氏体分数,使基体和堆焊层的塑韧性增加,进而抑制了裂纹的产生;同时又由于合金元素能形成碳化物,因此提高了堆焊层的硬度。

Using 45# steel as matrix material, the laser bead welding experiment is proceeded by adding transi－tion alloy cladding layer and choosing special welding wire in the case of no proheating. The added alloying agents change the percentage of Austenite in the laser cladding layer, so increasing the plasticity and ductility of the matrix and bead welding layer, and then depressing the cracks. Meanwhile, alloying agents can form carbides, so the hard－ness of bead welding layer is increased.