If undercutting occurs while MIG welding what should you do?

If undercutting occurs while MIG welding, first assess the weld to determine the extent of the issue. To address it, you can grind out the undercut and then re-weld the area, ensuring proper technique and settings to prevent recurrence. Adjusting travel speed, voltage, and wire feed speed can help mitigate future undercutting. Additionally, maintaining an appropriate angle and distance from the workpiece can improve weld quality.