Fitting analysis and optimization of MIG welding current for stainless steel

In order to rationally select the welding current of stainless steel during metal inert gas (MIG) welding, its welding current under different plate thicknesses was taken as the object of study. The scatter function provided by the data fitting software was used to draw scatter plots for the welding current data from two different sources, the polynomial fit (polyfit) function and the curve fitting toolbox were used to fit polynomial curves and perform optimality analysis on the fitted equations. Scatter plots and first-, second-, and third-order curve fitting equations for welding currents at different plate thicknesses were obtained, as well as curve equations for the optimum order of welding current data from two different sources. The results show that the optimization effect of the third- order curve is superior to that of the first-order and second-order curves. Finally, through the experiment, it is verified that the curve equation has some guiding significance in determining the welding current range of stainless steel MIG welding.