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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.
Based on the conservation of energy and Fourier’s law, the mathematical model of the influence of resistance heating and bath heat transfer on the temperature distribution of the hot wire was established. Based on the principle of superposition, the thermal steady state of the hot wire of the tungsten inert gas (TIG) The mathematical model of the temperature distribution and its calculation results are validated.The influence of current density, wire feed speed and wire elongation on the temperature distribution of the wire is discussed.The results show that the mathematical model has a high accuracy Can be used for the analysis of the hot wire heating process. The larger the current density of the wire, the higher the temperature of each position of the wire. The higher the wire feeding speed, the lower the temperature of the wire. The larger the wire elongation, The higher the heat temperature, the numerical matching between the wire current density, wire feed speed and wire dry elongation under certain conditions was obtained.