非熔透激光搭接焊薄钢板的试验研究

摘要

In order to study the welding quality of partial penetrated laser overlap-welding of thin steel sheet, SUS304 austenitic stainless steel and SPCC cold-rolled steel sheet were welded with fiber laser and CO2 laser. And the main factors affecting the partial penetrated laser welding were analyzed. The micro-structure and the mechanical properties of the weld were measured, finally, the effects of main welding parameters, including laser power, welding speed, defocus distance, pulse frequency and duty ratio, on weld surface quality and performance were obtained. The results show that under the proper welding condition, the weld topography is uniform and continuous, the strength of weld is 50% higher than that of base metal, and its micro-hardness of fusion zone is higher than that of base metal.%为了研究薄钢板的非熔透激光焊接的焊接质量,采用光纤激光及CO2脉冲激光对SUS304奥氏体不锈钢和SPCC冷轧碳钢薄板进行了非熔透搭接焊试验,分析了影响非熔透激光焊接的主要因素,并对接头的组织和力学性能进行了测试,得出激光功率、焊接速率、离焦量、脉冲频率、占空比等主要工艺参量对焊缝成形及试件性能的影响规律.结果表明,在适宜的焊接工艺参量下,非熔透激光焊接焊缝形貌平整连续；焊缝强度达到母材强度的50％以上；焊缝区的显微硬度高于母材.