| 摘要: |
| 采用氩弧焊的方法在窄间隙条件下,采用TIG填丝多层焊的方式实现了TC4厚板钛合金的优质连接.结果表明,通过优化焊接参数和合理的惰性气体保护方案设计,保证了接头的完整性与可靠性.通过宏观和微观金相分析,发现窄间隙焊接条件下晶粒生长遵循联生结晶生长规律;由于受到焊接热循环的作用,致使接头显微结构随着冷却速度变化呈现不同的组织结构;窄间隙TIG焊接头因啮合强化而使得接头强度得到提高,焊缝的平均强度达到母材的90%以上. |
| 关键词: 厚板钛合金 窄间隙TIG焊 组织 力学性能 |
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| 基金项目:国家自然科学基金资助项目(50974046,50904020);哈尔滨市青年科技创新人才资助项目(2009RFQXG050) |
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| Microstructure and mechanical properties of thick titanium alloy joint in narrow-gap TIG welding |
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LÜ Shixiong1, CUI Qinglong1, HUANG Yongxian1, ZHENG Chuanqi1, WANG Yang2
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1.State Key Laboratory of Advanced Welding and Joining, Harbin Institure of Technology, Harbin 150001, China;2.Qianjiang Motorcycle Co., Ltd., Wenling 317500, China
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| Abstract: |
| High-quality joint of thick TC4 titanium alloy plate was made by narrow-gap tungsten inert gas(TIG) welding with proper gas protection and welding parameters.Metallographic analysis of the resultant joints revealed the rules of grain growth and microstructure characteristics.The variation of the cooling speed resulted in different microstructures in the heataffected zone(HAZ).The tensile test showed that the average tensile strength of the joints reached 90% of that of the base metal, which was attributed to the mechanism of meshing strengthening during narrow-gap TIG welding of thick titanium alloy plate. |
| Key words: thick titanium alloy plate narrow-gap TIG welding microstructure mechanical property |
