高频厚壁管焊接的影响因素

中、大壁厚钢管焊接热影响区的形状就像一个沙漏，在壁厚方向造成表面过热而中心低温现象，从而限制焊接速度。通过对V形角、弹复量(结构应力)、焊接速度和频率等影响因素的研究，利用电磁温度场致发射显微镜对焊点具有代表性的温度分布区进行了二维分析，用焊点处的等温曲线表示了结果。

Influence Factor of High Frequency Thick Wall Tube Welding

The heat affected zone(HAZ) in a medium and thick wall tube is shaped like an hourglass.This can give overheated corners and a cold center in the tube wall,which limits weld speed.A parameter study of the influence of Vee angle,spring back,weld speed and frequency is carried out. Two-dimensional,coupled electromagnetic and thermal FEM analyses give the temperature distributions in the cross-section of the weld point.The results are presented as isothermal lines at the weld point.