基于响应面法的TC4薄板激光焊接工艺参数优化

Study on Laser Welding Parameters of TC4 Titanium Alloy Thin-Plate Based on Response Surface

为解决脉冲激光焊接工艺参数多，参数调整依赖经验的现状，采用二次回归正交旋转组合的方式，设计激光焊接TC4薄板的试验方案。基于响应面法构建TC4薄板激光焊接工艺参数（电流、脉宽、频率）与预测响应值（接头拉伸强度）之间的数学模型，并通过该数学预测模型对各焊接工艺参数在焊接过程中的影响规律进行了研究。分析表明，焊接电流对激光焊接接头的拉伸性能具有主要影响，而脉宽和频率在对接头拉伸性能的影响方面具有明显的交互作用，且任一单因素对接头拉伸性能的影响效果均小于焊接电流。得到适用于1．5mm厚TC4薄板的最优焊接工艺参数，并进行了相关试验验证，结果表明，所建模型与实际符合良好，具有工程实用价值。

To solve the problem that the adjusting of welding parameters depend on experience, experimental scheme of TC4 light gauge laser welding is designed with orthogonal regressive rotation design. Mathematic model of laser welding parameter （current, pulse width, frequency） and prediction response numeric （tensile-strength） is established based on response surface. Influence regular pattern of each processing parameter for welding procedure is analyzed by the mathematic prediction model. As the analysis shows that welding current has main effects on the tensile properties of the laser welding joint and not only the influence of pulse width and frequency on the tensile properties of the joint has obvious interaction, but also the impact effects of any single factor for pulse width or frequency are less than welding current. Best-fit welding parameters for TC4 sheet of δ= 1.5 mm are obtained, and relevant test on which is performed. The results show that the mathematic model is consistent with the actual well.