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建立了复合热源作用下的三维高强钢CO2激光焊接有限元分析模型,对高强钢板CO2激光焊接进行基于ANASYS平台的焊接过程数值模拟。焊接热源分为沿工件表面的高斯热源和沿激光入射方向的柱状热源两部分组成,获得了焊接温度场分布及熔池温度形态分布。结果表明,激光焊接温度场是一组具有梯度的以焊接方向为长轴的椭圆。光斑中心前半部分的等温线较为密集,后半部的等温线较稀疏,且离光斑越远,温度梯度越小。熔池高温时间短,焊缝截面熔深大,表现出了激光焊接热量集中、穿透力强的特点。试验所得的熔池温度场界面与试验结果吻合良好,对于分析其复杂的温度场具有一定的理论意义。
The CO2 laser welding finite element model of three-dimensional high-strength steel under the effect of compound heat source was established. The numerical simulation of welding process based on ANASYS platform was carried out for CO2 laser welding of high strength steel. The welding heat source is divided into two parts: the Gaussian heat source along the surface of the workpiece and the columnar heat source along the laser incident direction. The distribution of the welding temperature field and the distribution of the bath temperature are obtained. The results show that the laser welding temperature field is a group of elliptical with gradient in the direction of the welding axis. The first half of the spot center isotherm is more intensive, the second half of the isotherm more sparse, and the farther away from the spot, the smaller the temperature gradient. High temperature bath time is short, the weld penetration depth, showing the laser welding heat concentrated, strong penetrating characteristics. The temperature field of the weld pool obtained by the experiment is in good agreement with the experimental results, which has certain theoretical significance for the analysis of its complex temperature field.