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利用5kW光纤激光作为热源,实现4mm厚的YG20硬质合金与45#钢的激光焊接。通过分析焊缝组织分布特征,观察焊缝在HNO_3、H_2O_2、村上试剂中浸蚀后的表面形貌,讨论了激光扫描速度对热胀系数差异较大的异种金属焊接后焊缝成形的影响规律。结果表明:当被焊材料厚度为4mm时,在激光功率为3.84kW、激光扫描速度为0.96m/min及离焦量为-8mm的条件下,可获得冶金结合良好的YG20硬质合金/45#钢焊接接头。
Using 5kW fiber laser as a heat source, laser welding of 4mm thick YG20 cemented carbide and 45 # steel was realized. By analyzing the distribution characteristics of the weld, the surface morphology of the weld after etching in HNO_3, H_2O_2 and Murakami was observed. The influence of the laser scanning speed on the weld formation after the dissimilar metal welding with different thermal expansion coefficients was discussed . The results show that when the thickness of the material to be welded is 4mm, YG20 cemented carbide with good metallurgical bonding can be obtained under the conditions of laser power of 3.84kW, laser scanning speed of 0.96m / min and defocus amount of -8mm. # Steel welded joints.