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以8mm厚的高氮钢板为试验材料,采用额定功率为4kW的Nd:YAG固体激光器对其进行了激光-电弧复合焊接,研究了不同电弧能量对焊接接头性能的影响。研究表明,随着电弧能量的增加,焊接表面质量有所提高;焊缝的熔深及熔宽随电弧能量的增加而增大,且熔深较熔宽增加更明显,热影响区范围随电弧能量增加而增大;随着电弧能量的增加,熔池熔滴过渡由滴状过渡转变为射流为主、射滴为辅的过渡形式;焊接接头的硬度值随着电弧能量的增加呈整体下降趋势,且造成硬度下降的原因是焊接接头的氮含量随热输入的增加而降低。
A high-nitrogen steel plate (8mm thick) was used as the experimental material. Laser-arc hybrid welding was carried out using a Nd: YAG solid laser with a rated power of 4kW. The effects of different arc energies on the performance of the welded joints were studied. The results show that the quality of the welding surface increases with the increase of arc energy. The penetration depth and melting width of the weld increase with the increase of arc energy, and the penetration depth increases more obviously than the melting width. The heat affected zone With the increase of arc energy, the transition of molten pool droplet transition from droplet transition to jet-based, droplet-supplemented transitional form; the hardness of welded joint decreases with the increase of arc energy The trend, and the reason for the decrease in hardness, is that the nitrogen content of the welded joint decreases as the heat input increases.