Development of Wire Height Control Technique for All Position GTA Welding

Development of Fully Automated GTA Welding System for Pipe (Report 1)

Abstract

To complete all position fully automated GTA welding, wire height location control is necessary. Wire height is affected by weld pool movement according to welding position change, melting spray transfer with gravity, curling during uncoiling and disturbance of wire melting condition from heating arc. To solve these problem we checked the voltage change between wire and base metal from the melting phenomena of wire. We developed the control technique to keep the wire height always suitable by measuring the short-circuiting counts (N) and short-circuiting percentage of time (At) from wire melting phenomena.
At the same time to prevent bad effect to the electrode accompanied by wire height irregularity we developed the electrode abnormality judgement software.