正态分布焊接热源集中系数的确定和研究

THE DETERMINATION OF NORMAL DISTRIBUTION CONCENTRATION FACTOR FOR HEAT SOURCE OF WELDING

摘要: 本文利用有限厚度无限大平板的三维焊接温度场计算公式,通过最小二乘法使计算的热循环曲线与实际的热循环曲线最佳逼近,推导出了焊接热源集中系数K的新的试验-计算方法。实践表明,这种方法不但简单、可靠,而且实验条件也不苛刻。本文还建立了给定规范下焊接热源集中系数K与焊接电流的关系曲线,并对曲线进行了分析。

Abstract: In this paper,by the use of the formula for 3-dimensional temperature field of welding on unlimited plate of limited thickness and by the use of the method of least square,the authors get a best approach for the calculated thermal cycle curve to the actual one.A new "test and calculate" method is deduced for the determination of the concentration factor K for heat source of welding.It is simple and reliable,and involves no severe condition for experiment.A curve showing the relation between K and welding current under given specifications is established and supplemented with analysis.