HG785高强结构钢激光与CO_2气体保护焊接接头组织性能对比  

Microstructure and Poperties of Laser Welding and CO_2 Welding of HG785 ffigh Strength Structure Steel

作　　者：钟如涛[1] 陈浮[1] 刘昌明[1] 张萍[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《应用激光》2011年第2期147-150,共4页Applied Laser

摘　　要：采用高功率CO_2激光焊接8mm厚HG785材料,研究了其激光焊缝组织特性和机械性能,探索了高强中厚板的激光焊接适应性。结果表明:当激光功率3500W,焊接速度1.5m/min时进行双面焊接,获得了无缺陷的良好焊缝。与CO_2气体保护焊接相比,激光焊接速度快,变形小,焊缝宽度窄(最宽处2mm),热影响区小(0.4mm),焊缝晶粒细小;-20℃焊缝冲击韧性CVN=50J,最高硬度为383HV,焊缝各项性能指标满足高强结构钢的焊接要求。HG785 high strength structure steels with a thickness of 8 mm are welded using high power CO2 laser. The Microstructure and Mechanical properties of the welding were studied.The results show that no crack welding can be achieved by double-face welding at laser power 3.5 kW and welding speed of 1.5 m/min. Comparing with GMAW, laser welding has a narrow seam width of 2 ram, a small heat-affected zone of 0.4 ram, a fast welding speed, a small deformed and the fine crystal. Charpy notch toughness at -20 ℃ is CVN ：50 J in weld metal,the maximum hardness of butt welded joint is about 383 HV. All the mechanical properties of weld produced by using laser welding can meet the welding technical requirements of HG785 high strength structure steel.

关 键 词：激光焊接 HG785高强结构钢 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]