Abstract: In order to study the influence of high-speed argon tungsten-arc welding by transverse magnetic field on quality of stainless pipe welding joint,the test has been realized using multivariable nonlinear regression orthogonal combination method.The welding joint tensile strength and form factor of weld(the weld width/penetration) were considered as important assessment factors of weld quality.The magnetic field strength and argon flow were taken to be considered,and the relationship between them was then analyzed.Nine groups of testing were designed by orthogonal method,according to regression design theory,the binary quadratic nonlinear regression equation was established and the remaining standard deviation was calculated．The experimental results showed that regression models could realize the forecast of welding joint tensile strength and form factor of weld.Finally,the three-dimensional view was made and the influence of magnetic field strength changing regularity on weld quality was studied.