International Journal of Mechanical Engineering

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.

Titanium alloy sheets; Pulse TIG welding; Deformation control; Process parameter optimization