Abstract
An automatic welding system that can simultaneously control the bead height and the back bead shape in one side MAG welding process with backing plate has been introduced in this paper. In the system, a high speed rotating arc welding method is used and the seam tracking and the torch height control are realized by utilizing arc sensing technique.
On the other hand, the variations of groove shape is also detected by the arc sensing technique. The detecting mechanism is in detail discussed in the paper.
Moreover, the system uses a new welding parameters control method that is developed by authors in which only wire feeding rate and welding voltage are adaptively regulated and the other welding conditions are all holded. The new method is able to keep the bead height constant and hold the back bead shape in the case of groove shape changing.
The primary welding experimental results have proved that the system is effective and satisfactory for controlling the weld bead shape in one side GMAW process with backing plate.
