Patent ID: 9604301
Date: 2017-03-28
CPC Classifications: B23K

Claim:
1. A method to produce a full penetration weld, where the back-side surface of the work-piece must be melted, reducing the possibility of burn-through, in gas tungsten arc welding, where the electrode is non-consumable tungsten, without a filler metal comprising applying a peak current of high amperage to melt the work-piece from the front-side of the work-piece to increase the weld pool formed by the metal melted from the work-piece; detecting and analyzing a signal that reflects the change in the elevation of the front-side weld pool surface with time; reducing the current to a low amperage base current based on the analysis of the detected signal which reflects the change in surface elevation and is determined the elevation has changed from toward the tungsten electrode to away from the tungsten electrode.