激光焊接960高强钢T型接头弯曲性能研究  

Study on Bending Behavior of Laser Welding T Joints of 960 High Strength Steel

作　　者：熊孝义 乔及森[1] 蒋小霞[1] 朱亮[1] 吴毅雄[2] 陈剑虹[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]上海交通大学上海市激光制造与材料改性重点实验室,上海201100

出　　处：《热加工工艺》2014年第19期158-161,共4页Hot Working Technology

基　　金：国家自然科学基金重点资助项目(51035004)

摘　　要：主要研究了I型芯三明治板T型接头弯曲失效过程及焊接参数对接头弯曲性能的影响,分析了相同焊接速度（1.5 m/min）下不同焊接功率所得接头的组织及性能。研究发现,焊接功率为11 kW的T型接头在失效过程中有弹性阶段、弹塑性阶段、塑性阶段和断裂阶段,而焊接功率为9和10 kW的T型接头经历较短的塑性阶段。根据弯矩与转角关系可知,焊接功率为9和10 kW的T型接头转角为4°~6°之间,而11 kW接头转角为11°。9、10和11 kW焊接接头的旋转刚度平均值为：86、89和99 kN。分析接头受力状态可知,由于接头的几何不连续性使得接头应力集中状态不同,连接宽度越大应力集中系数越小,且间隙在一定范围增大时应力集中系数越小。The bending failure process of T-joint from I-core sandwich plate and the effects of welding parameters on the welding performance were studied. The microstructure of T-joint at different welding power while at the same welding speed（1.5 m/min） was analyzed. That four stages were contained in the failure process under the welding power of 11kw： elastic stage, elastic-plastic stage, plastic stage and fracture stage, while there is no plastic stage under the welding power of 10 kW and 9kW, the moment rotation curve of the T-joint is drew, it showed the rotation angle is 4-6° under 9kW and 10 kW,while the joint rotation angle is 11° under 11 kw. The mean rotational stiffness of the welded joints is 86 kN, 89 kN and 99 kN under9kW,10 kw and 11 kw. According to the stress state of T-joint, the stress concentration of the joint connection is different due to the geometric discontinuity. The stress concentration factor decreases with the increase of width connection, and the stress concentration factor can be smaller if the gap increases in a certain range.

关 键 词：激光焊 三明治板 焊接接头 失效 

分 类 号：TG404[金属学及工艺—焊接]