This paper aims at the problem of the repeated repair in welding of bogie beam tube and longitudinal beam when face in the weld depth isn’t enough. It is different from the way in the past in which increase the current to add the welding depth. This paper proposes that use the advantage of automatic welding robot. To weld the plate of T joint through using the methods of the welding of pull the arc which it is hard to manual welding

using the special command to adjust arc shape

using the different welding position when welding the different layer. It is achieve the target that only increase welding depth but no additional current

and reduced the welding stress and welding deformation

which it can be useful for the similar welds of automatic welding robot.