To correct undercutting, follow these steps: initiate the arc, establish a weld puddle and visually check to see that the weld puddle is equally spread across both sides of the joint you are TIG welding. Adjust your torch angle accordingly to ensure even heat distribution. Also, watch to see that the filler metal flows evenly into the weld puddle, as this is an indication that the heat is being distributed equally to both parts of the joint.
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