The robot MAG welding method is used for flat welding test

and the influence of the important welding parameters on the appearance of weld in the rapid metal forming process of robot MAG welding is studied. By single factor test method

the influence of welding current

welding voltage

welding speed and wire extension on the appearance of weld are tested respectively

and the influence rules of different welding parameters on weld geometry dimension（weld width

reinforcement and penetration） are obtained. The experimental results show that welding current

welding voltage and welding speed have significant influence on the weld geometric dimension

while wire extension has little influence on the weld geometric dimension. The weld geometric dimension can be adjusted slightly by changing the welding parameters.