| AZ31B变形镁合金板材的TIG焊接 |
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| 引用本文： | 于思荣,陈显军,刘耀辉,卫广平,林阳阳,宋雨来,朱先勇.AZ31B变形镁合金板材的TIG焊接[J].吉林大学学报(工学版),2009(Z1). |
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| 作者姓名： | 于思荣 陈显军 刘耀辉 卫广平 林阳阳 宋雨来 朱先勇 |
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| 作者单位： | 吉林大学材料科学与工程学院;长春市冠信轨道客车配件有限责任公司;吉林大学机械科学与工程学院; |
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| 基金项目： | 教育部新世纪优秀人才支持计划项目;;长春市科技支撑计划项目(2007KZ07) |
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| 摘 要： | 采用TIG焊对5 mm厚AZ31B挤压镁合金板材进行了焊接试验。采用万能拉伸试验机、金相显微镜、扫描电子显微镜和显微硬度仪等分析测试手段对焊接接头的组织、力学性能以及断口形貌等进行了分析。探讨了焊接电流对焊接接头的组织及力学性能的影响,揭示了不同焊接电流下焊接接头的断裂机制。结果表明,采用TIG焊焊接5 mm厚AZ31B镁合金板时,开X型坡口,采用双面焊接双面成型工艺,在130~145 A焊接电流及合适焊接速度条件下,能得到表面成型良好的焊接接头。当正反面焊接电流均为145 A时,AZ31B镁合金板焊接接头的抗拉强度达到最大值248.6 MPa,约为母材强度的84.0%。AZ31B镁合金板焊缝区显微硬度比母材区稍有所下降,热影响区显微硬度下降比较严重。当焊接电流为145 A时,AZ31B镁合金板焊接拉伸断口有大量韧窝,属韧性断裂。
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| 关 键 词： | 金属材料 AZ31B镁合金 TIG焊 抗拉强度 显微硬度 断裂机制 |
TIG welding of AZ31B magnesium alloy plates |
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| YU Si-rong,CHEN Xian-jun,LIU Yao-hui,WEI Guang-ping,LIN Yang-yang,SONG Yu-lai,ZHU Xian-yong.TIG welding of AZ31B magnesium alloy plates[J].Journal of Jilin University:Eng and Technol Ed,2009(Z1). |
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| Authors: | YU Si-rong CHEN Xian-jun LIU Yao-hui WEI Guang-ping LIN Yang-yang SONG Yu-lai ZHU Xian-yong |
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| Affiliation: | 1.College of Materials Science and Engineering;Jilin University;Changchun 130022;China;2.Guanxin Railway Vehicles Fittings Co.Ltd of Changchun City;Changchun 130000;3.College of Mechanical Science and Engineering;China |
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| Abstract: | TIG welding test of AZ31B magnesium alloy plates with the thickness of 5 mm was carried out.The microstructures,tensile fracture surfaces,and mechanical properties of welded joints were investigated by means of an optical microscope,a scanning electron microscopy,a universal tensile testing machine and a microhardness testing instrument.The effects of the welding current on the microstructure and mechanical properties of welded joints were discussed.The results show that when TIG welding was used to weld AZ... |
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| Keywords: | metallic material AZ31B magnesium alloy TIG welding tensile strength microhardness fracture mechanism |
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