Influence of magnetic controlled technology on formation of high-speed TIG welding

Increasing TIG welding speed may raise productivity.Welding speed increasing,however,will cause arc dragged backwards and anode spot delayed seriously.The two phenomena generate the defects of undercut and hump seam.As usual,the method of augmenting the shielding gas feed rate or increasing welding current was chosen to achieve it,but the abilily to increase the welding speed was limited.The influence of transverse magnetic field on the welding speed,welding current and argon flow of high-speed TIG welding for austenite stainless steel were studied.The microstructure observation and flaring test were ivestigated.The experiment results indicated that welding speed could be increased from 3.5 m/min to 5.5 m/min,at the same time,welding current could be decreased from 95 A to 75 A,gas feed rate could be reduced from 0.7 m³/h to 0.5 m³/h,and the problems of undercut and hump seam due to high-speed TIG welding could be well solved.