I have an arc welder, which is old and thus has a thin layer of rust on the welder housing. The dial is a moving needle whch goes from one end of the gage to the other, but the thickness and amperage digits are semi gone and unreadable.To find the ideal amperage I have been using trial and error to find the best dial position for a certain sort of metal. Is there a standard chart for the thickness of the metal and the hieight of the amperage? It is a 180amp arc welder, if that helps.
