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推导出直流和脉冲焊时移动“正态－圆形分布”热源焊接δ板厚无限大平面的三维温度场解析计算公式，并通过对１ｍｍ１８－８不锈钢薄板直流和脉冲ＴＩＧ焊的焊缝正、反面宽度进行计算和实测，验证了其公式的正确性，其平均误差为４．９２％。
The analytical formula of the three-dimensional temperature field of the δ plate thickness infinite plane of the “normal-circular distribution” heat source welding during DC and pulse welding is deduced. Through the analysis of the positive and negative TIG welding of 1mm18-8 stainless steel sheet, The width of the back surface is calculated and measured, and the correctness of the formula is verified. The average error is 4.92%.