Optimization of welding parameters for Q235 steel sheet using taguchi technique

With the widespread application of Q235 steel in welding structures of modern manufacturing machinery, it is urgent to study the welding quality of Q235 steel welding joints to improve the safety, stability, and service life of machine operation. This study focuses on arc welding of Q235 steel sheets and establishes an optimization technique for welding process parameters using the Taguchi technique to explore the yield strength of welded joints. Three different variable welding parameters, namely welding speed, gap, and linear displacement, were selected and experimented with using an L9 orthogonal array. This research developed the model of correlation between the welding parameters of Q235 steel plates and the yield strength of the corresponding welded joints. Based on experimental results and the model, the optimal welding parameters for obtaining yield strength are 5.4 m/min welding speed, 2 mm gap, and 0 mm linear displacement. The analysis of variance results reveals that linear displacement serves as the primary variable parameter for achieving optimal yield strength in welded joints, requiring precise control. In contrast, welding speed has a comparatively minor effect on joint yield strength and can be flexibly adjusted based on specific welding requirements.