论文部分内容阅读
采用300 W准连续脉冲光纤激光器对1mm厚304不锈钢进行拼焊试验,分析了激光峰值功率、脉宽、频率、离焦量以及焊接速度等主要焊接工艺参数对焊接质量的影响规律。结果表明,对于1mm厚304不锈钢准连续脉冲光纤激光焊接,在高功率且大离焦量的情况下焊接得到的焊缝成型和力学性能均优于低功率且小离焦量下的焊接效果。在优化的工艺下进行焊接时,焊接过程中几乎无飞溅,并且可以得到表面均匀一致,无裂纹和气孔且成形优良的焊缝。拉伸试验结果表明,焊缝力学性能优良,其抗拉强度可达682.32 MPa,优于母材。
A 300 W quasi-continuous pulsed fiber laser was used to test the welding quality of 1 mm thick 304 stainless steel. The influence of the main welding parameters such as laser power, pulse width, frequency, defocus and welding speed on the welding quality was analyzed. The results show that for the 1mm thick 304 stainless steel quasi-continuous pulsed fiber laser welding, the weld formation and mechanical properties obtained by welding at high power and large defocus amount are better than the welding results at low power and small defocus. When welding under an optimized process, there is almost no spattering during the welding process, and welds with a well-formed surface without cracks and pores can be obtained. Tensile test results show that the excellent mechanical properties of the weld, the tensile strength of up to 682.32 MPa, better than the base metal.