车用铝合金光纤激光搭接焊的研究

针对车用5052铝合金进行了高功率光纤激光搭接深熔焊试验研究,分析了光纤激光焊接的主要影响因素,并对接头组织和力学性能进行了测试。通过对车用铝合金光纤激光焊接特性的分析得出,传输光路的光纤芯径、板间间隙的大小、保护气体的种类和保护方式等对搭接接头形貌有着重要的影响。采用高功率光纤激光焊接时,速度快,熔池及热影响区(HAZ)窄。在适宜的焊接工艺参数下,光纤激光焊接接头上、下表面焊缝形貌平整连续;焊缝区显微硬度高于母材;接头抗拉伸强度高于抗拉剪强度,断口出现在搭接焊缝一侧的热影响区内,断口以韧窝形貌为主,属于以韧性断裂为主、脆性断裂为辅的混合断裂。

Abstract

Experimental study on high power fiber laser deep-penetration welding of automobile 5052 aluminum alloy in an overlap configuration is carried out,and the main influencing factors on fiber laser welding are analyzed,and the micro-structure and the mechanical properties of the welded joints are measured. Through analyzing fiber laser welding performance of automobile aluminum alloy,the influencing factors such as fiber core diameter,gap thickness between two plates,kinds of shielding gas,and the protection way on the morphology and properties of overlap-welded joint are prominent. High welding speed and narrow weld pool and heat affected zone (HAZ) can be obtained when welding by fiber laser. Under the proper welding condition,the weld topography of top surface and bottom surface is even and continuous. Micro-hardness in fusion zone is higher than that of base material. The tensile-strength of welding joints is higher than its shear strength. The fracture is happened in HAZ and its topography is a mixture of ductile fracture as main mode and brittle fracture as subsidiary mode.

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梅丽芳, 陈根余, 金湘中, 张明军, 陈明. 车用铝合金光纤激光搭接焊的研究[J]. 中国激光, 2010, 37(8): 2091. Mei Lifang, Chen Genyu, Jin Xiangzhong, Zhang Mingjun, Chen Ming. Study on Fiber Laser Overlap-Welding of Automobile Aluminum Alloy[J]. Chinese Journal of Lasers, 2010, 37(8): 2091.

车用铝合金光纤激光搭接焊的研究

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