基于PLC控制的T2紫铜-SUS304不锈钢激光焊接组织与性能研究  

Study on Laser Welding Microstructure and Properties of T2Copper and SUS304 Stainless Steel Based on PLC Control

作　　者：赵媛媛[1] 户佩佩 李恒[2] 邢峰 Zhao Yuanyuan;Hu Peipei;Li Heng;Xing Feng(Henan Vocational College of Mechanical and Electrical Engineering,Zhengzhou,Henan451191,China;Zhengzhou University,Zhengzhou,Henan450001,China)

机构地区：[1]河南机电职业学院,河南郑州451191 [2]郑州大学,河南郑州450001

出　　处：《应用激光》2021年第2期284-292,共9页Applied Laser

基　　金：中国博士后科学基金资助项目(20170410886);河南省自然科学基金项目(411063117)。

摘　　要：采用激光深熔焊方法对T2紫铜和SUS304不锈钢进行了焊接处理,研究了基于PLC控制的光束偏移对焊接接头显微组织和拉伸性能的影响。结果表明:不同光束偏移量的T2紫铜-SUS304不锈钢焊接接头的剖面形貌中均呈现铜侧平直、钢侧沙漏状形态;光束正偏移时焊缝较窄、负偏移时焊缝较宽;光束正偏移时的铜侧热影响区宽度明显大于光束负偏移(光束偏向钢侧)时,光束正偏移时钢侧熔合线附近的胞状枝晶较小且存在较多的颗粒状Cu2O相,光束负偏移时熔合线附近为明显垂直于焊缝生长的细长柱状晶以及靠近焊缝中心的网状胞晶,局部可见颗粒状Cu2O相;光束偏移0和+0.15mm的焊接接头断裂位置在焊缝处,光束偏移+0.30mm、-0.15mm和-0.30mm的焊接接头断裂位置都处于铜侧热影响区;光束偏移+0.3mm时可以取得较好的焊接效果,焊接接头的拉伸断口形貌观察结果与拉伸测试结果相吻合。Laser deep penetration welding(LDW)was used to weld T2copper and SUS304stainless steel.The effect of beam offset controlled by PLC on Microstructure and tensile properties of welded joint was studied.The results show that the profile morphology of T2copper-SUS304stainless steel welded joints with different beam offsets are straight on the copper side and hourglass on the steel side;the weld seam is narrower when the beam offset is positive and wider when the beam offset is negative.The results show that the width of the heat affected zone on the copper side is significantly larger than that on the steel side when the beam is positive offset(the beam is biased to the steel side),and the cellular dendrites near the fusion line are smaller and there are more granular Cu2O phases near the fusion line.When the beam is negatively offset,there are slender columnar crystals growing perpendicular to the weld seam and reticular cells near the weld center,and granular Cu2O can be seen locally Phase.The fracture position of welded joint with beam offset of 0mm and+0.15mm is at the weld joint,and the fracture position of welded joint with beam offset of+0.30mm,-0.15mm and-0.30is in the heat affected zone of copper side.When the beam offset is+0.30mm,better welding effect can be obtained.The observation results of tensile fracture morphology of welded joint are consistent with the tensile test results.

关 键 词：T2紫铜 SUS304不锈钢 激光焊接 微观组织 性能 

分 类 号：TG456.7[金属学及工艺—焊接]