应用激光, 2017, 37 (5): 649, 网络出版: 2017-11-24
焊接参数对高氮钢复合焊焊缝形貌与力学性能影响
Effect of Welding Parameters on Weld Appearance and Mechanical Properties of High Nitrogen Steel by Hybrid Welding
高氮钢 熔深 熔宽 激光-电弧复合焊 力学性能 high nitrogen steel weld penetration weld width laser-arc hybrid welding mechanical properties
摘要
焊接参数在一定程度上决定着焊缝的形貌及力学性能。采用激光-电弧复合焊接方法对高氮钢进行了焊接, 研究了不同焊接参数对焊缝形貌及力学性能的影响。研究结果表明:焊缝熔深随激光功率和焊接电流的增加而增大, 随焊接速度的增大而减小; 焊缝熔宽随激光功率的增大先减小后增大, 随焊接电流的增大而增大, 随焊接速度的增大其变化趋势相反, 当焊接速度ν=0.8 m/min时, 焊缝熔宽达到最大, 其值为11.8 mm。同时对不同参数下的焊接接头进行拉伸和冲击试验, 结果发现:焊缝拉伸强度随激光功率和焊接速度的增大先增大后减小, 随焊接电流的增大而减小; 当焊接速度ν=0.8 m/min时, 平均拉伸强度最大, 为875 MPa; 焊缝冲击功随激光功率和焊接电流的增大而增大, 随焊接速度的增大其变化趋势相反; 当焊接电流I=270 A时, 焊缝平均冲击功最大, 为49 J; 通过扫描电镜对其拉伸、冲击断口进行观察, 发现其断裂形式以韧性断裂为主。
Abstract
The welding parameters determine the appearance and mechanical properties of the weld joint on a certain extent. The high nitrogen steel was welded by laser-arc hybrid welding. The influence of different welding parameters on the weld appearance and mechanical properties was studied. The results show that the weld penetration is increased with increasing laser power and welding current, and decreased with increasing welding speed. The weld width is first increased and then decreased with increasing laser power, and it is increased with increasing welding electric current, but the variation tendency of weld width is opposite with increasing welding speed, when the welding speed ν=0.8 m/min, the weld penetration to reach the maximum, its value is 11.8 mm. At the same time, the tensile and impact test were carried out in various welding parameters. The results show that the tensile strength of weld joint is first increased and then decreased with increasing laser power and welding speed, and decreased with increasing welding electric current. When the welding speed ν=0.8 m/min, the average tensile strength is the largest, the value is 875 MPa. The impact energy is increased with increasing laser power and welding electric current, the variation tendency is opposite with increasing welding speed. The highest average impact energy is 49 J when the welding current I=270 A. The tensile and impact fractures were observed by scanning electron microscope, and the fracture was found to be mainly ductile fracture.
李欣欣, 张宏, 宋晓龙, 刘凤德, 徐春鹰, 刘双宇. 焊接参数对高氮钢复合焊焊缝形貌与力学性能影响[J]. 应用激光, 2017, 37(5): 649. Li Xinxin, Zhang Hong, Song Xiaolong, Liu Fengde, Xu Chunying, Liu Shuangyu. Effect of Welding Parameters on Weld Appearance and Mechanical Properties of High Nitrogen Steel by Hybrid Welding[J]. APPLIED LASER, 2017, 37(5): 649.