上海交通大学学报

上海交通大学学报（自然版） ›› 2012, Vol. 46 ›› Issue (07): 1063-1068.

• 金属学与金属工艺 • 上一篇    下一篇

热丝TIG焊热丝准稳态温度场的解析模型  

赵福海a，b，华学明a，b，叶欣a，b，吴毅雄a，b，c   

  1. （上海交通大学a.材料科学与工程学院焊接工程技术研究所； b.上海市激光制造与材料改性重点实验室； c.金属基复合材料国家重点实验室, 上海 200240）
  • 收稿日期:2011-06-20 出版日期:2012-07-30 发布日期:2012-07-30

Mathematical Model of Quasi-state Temperature Distribution of  Hot-Wire during Hot-Wire TIG Welding Process

 ZHAO  Fu-Hai-a, b , HUA  Xue-Ming-a, b , YE  Xin-a, b , WU  Yi-Xiong-a, b , c   

  1. (a. Welding Engineering Institute of Materials Science and Engineering; b. Shanghai Key Laboratory of Materials Laser Processing and Modification; c. State Key Laboratory of MetalMatrix Composite, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2011-06-20 Online:2012-07-30 Published:2012-07-30

摘要： 摘要： 
基于能量守恒和傅里叶定律，建立了电阻加热和熔池传热对热丝温度分布影响的数学模型；基于叠加原理建立了电阻加热热丝钨极惰性气体(TIG)焊热丝准稳态温度分布的数学解析模型，并验证了其计算结果；讨论了热丝电流密度、送丝速度以及焊丝干伸长等因素对焊丝温度分布的影响规律.结果表明：该数学模型具有很高的精确性，可用于热丝加热过程的分析.焊丝电流密度越大，焊丝各位置温度越高；送丝速度越大，焊丝各点的温度越低；焊丝干伸长越大，焊丝端部的预热温度越高.得到了一定条件下焊丝电流密度、送丝速度和焊丝干伸长三者之间的数值匹配关系. 关键词： 
电阻热； 熔池传热； 叠加原理； 温度分布； 数学解析模型 中图分类号：  TG 444
文献标志码：  A    

Abstract: Based on the law of the conservation of energy and Fouriers law, the mathematical odels respectively considering the effect of resistance heat and the heat transferred through the weld pool on the hotwire temperature distribution were developed. And then based on the superposition principle the mathematical model of quasistate temperature distribution of hotwire heated by resistance energy  was  developed. The   accuracy   of  the   mathematical   model   was  validated   by comparing   the   result   of   calculating   from   the   mathematical  model  with   the   experimental  result from the literature. The impact of current density, wire feeding speed, wire extension on temperature  distribution   of   hot-wire  was elaborately  discussed.   The  results   show  that  the mathematical model has high accuracy to effectively analyze the process of wire heated   by  resistance   energy.   The  larger the current  density  or   wire  extension  is,  the   higher  the temperature in different positions on the wire extension is, however, the bigger the wire feeding speed is, the higher the preheating temperature is. In some certain cases, the matching relations  among current density, wire feeding speed and wire extension can be concluded.

Key words: resistance heat, heat transferred from the weld pool, superposition principle, temperature distribution, analytical mathematical model