加速步长法反演多丝埋弧焊双椭球热源模型参数

Inversing parameter values of double ellipsoid source model during multiple wires submerged arc welding by using Step Acceleration Method

关键词:  加速步长法  双椭球热源模型  多丝埋弧焊

Key words:  step acceleration method  double ellipsoid heat source model  multiple wires submerged arc welding

摘要:

结合有限元数值模拟和温度测量,运用加速步长法,反演了X70钢在多丝埋弧焊中双椭球热源模型前、后半球长半轴C_fi,C_ri(i=1,2,3).结果表明,当双椭球热源模型前、后半球长半轴C_fi=6,6,8mm,C_ri=15,20,30mm(i=1,2,3)时,在焊缝附近(表面距焊缝中心10mm和背面距焊缝中心14mm处)计算模拟得到的温度场曲线与实际测量得到的温度场曲线相似,两者的整体误差为0.6158,误差较小,从而证明了加速步长法反演多丝埋弧焊中双椭球热源模型前、后半球长半轴参数的合理性和准确性。

Abstract:

Applying the principle of Step Acceleration Method(Pattern Search Method), two parameter values of double ellipsoid heat source model, the rear half of semi-axe Cr and the front half of semi-axe Cf, can be predicted by the combination of finite element numerical simulation and temperature measurement in X70 steel during multiple wires submerged arc welding.The result illustrated that the temperature field curve obtained by numerical simulation was very similar with the one obtained by the experimental measurement, with the global error e only 0.615 8 in the weld region(the front surface region 10 mm far from weld center line and the back region 14 mm far from the weld center line)when C_ri equal 15, 20, 30 millimeters and C_fi equal 6, 6, 8 millimeters(i=1, 2, 3), which demonstrated the rationality and accuracy of the value of two types of parameters of the double ellipsoid heat source model in the multiple submerged arc welding by using Step Acceleration Method.