Deformation control and process parameter optimization of pulsed TIG welding on titanium alloy sheet
钛合金薄板脉冲TIG焊接变形控制与工艺参数优化

摘要

钛合金薄板在航空航天和高端制造领域应用广泛，但由于材料热导率低、热膨胀系数大，在脉冲TIG焊接过程中易产生焊接变形。为解决这一问题，本文围绕脉冲TIG焊接的热输入控制与工艺参数优化展开研究。通过调节脉冲电流、占空比、焊接速度等关键参数，分析其对焊接接头成形、残余应力及焊接变形的影响规律，并基于正交试验和多目标优化方法，提出一套最优工艺方案。结果表明，合理控制热输入可有效降低焊接变形，显著提升焊缝质量和尺寸稳定性，为钛合金薄板的高精度焊接提供技术支持。

Abstract

Titanium alloy sheets are extensively used in aerospace and advanced manufacturing sectors. However, their low thermal conductivity and high coefficient of thermal expansion make them prone to welding deformation during pulse TIG welding. To address this issue, this study focuses on thermal input control and process parameter optimization in pulse TIG welding. By adjusting key parameters such as pulse current, duty cycle, and welding speed, we analyzed their effects on weld joint formation, residual stress, and welding deformation. Through orthogonal experiments and multi-objective optimization methods, an optimal process scheme was proposed.
Results demonstrate that proper thermal input control effectively reduces welding deformation while significantly improving weld quality and dimensional stability, providing technical support for high-precision titanium alloy sheet welding.