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采用CMT(Cold Metal Transfer)焊接工艺对1.8mm厚MnE21挤压镁合金型材进行焊接试验,利用扫描电微镜、万能拉伸试验机、金相显微镜和显微硬度仪等分析测试设备对焊接接头的组织、力学性能及端口形貌等进行了分析。试验结果表明:采用CMT焊接工艺,在焊接电流110A、焊接电压12.4 V、焊接速度600mm/min时,可以获得良好的焊接接头,焊缝区的晶粒明显比热影响区和母材细小,是等轴晶组织。试样抗拉强度达到176.5MPa,断裂位置发生在热影响区,具有脆韧混合断裂特征。焊缝区的平均硬度值为77HV,高于母材和热影响区。
The welding test of 1.8mm thick MnE21 extruded magnesium alloy was carried out by CMT (Cold Metal Transfer) welding process. The welded joints were analyzed by scanning electron micrograph, universal tensile tester, optical microscope and microhardness tester The organization, mechanical properties and port morphology were analyzed. The experimental results show that the welded joints can be obtained with CMT welding process at 110A welding current, 12.4 V welding voltage and 600mm / min welding speed. The grain size of weld zone is obviously smaller than that of heat affected zone and base metal. Isometric crystal structure. The tensile strength of the sample reached 176.5MPa, the fracture location occurred in the heat affected zone, with the characteristics of brittle-dull mixed fracture. Weld zone average hardness value of 77HV, higher than the base metal and heat affected zone.