周祥曼,王印权,王礴允,柏兴旺,付君健,田启华

• 1:三峡大学机械与动力学院
• 2:南华大学机械工程学院

摘要(Abstract)：

搭接中心距对电弧增材搭接熔积的熔池流动及熔积层形貌有重要影响，为探究其影响机理，建立了钨极气体保护焊(Tungsten inert gas welding, TIG)电弧增材成形过程的三维数值模型，研究了不同搭接中心距对熔池流动及熔积层形貌的影响。结果表明：不同搭接中心距下熔池表面温度峰值相近，约为1900 K,表面流速呈非对称的双峰式分布。当搭接中心距小时，由于第一道焊道的支撑作用，使得第二道焊道横截面熔池流动和形貌不对称，熔池深而窄，熔池流动为单向的顺时针环流，左侧流速普遍大于右侧；随着搭接中心距的增大，第一道焊道的支撑作用逐步减弱，使得搭接焊道横截面熔池流动逐渐变为以第二道焊枪中心线为对称轴，左侧顺时针、右侧逆时针的两个环流，两侧流动逐渐对称，搭接熔池宽度逐渐增大、深度逐渐减小，两焊道逐渐分离并出现波谷，当搭接中心距为6 mm时熔积层形貌最平整。模拟与试验结果基本吻合，本研究结果可为电弧增材工艺参数调控提供理论支撑。

关键词(KeyWords)： 电弧增材;搭接中心距;数值模拟;熔积层形貌

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51705287,51975270);; 湖北省科学技术研究计划优秀中青年人才项目(D20211203)

作者(Author): 周祥曼,王印权,王礴允,柏兴旺,付君健,田启华

DOI: 10.13289/j.issn.1009-6264.2023-0295

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