How To Weld Painted Metal. Below are a few recommendations on how to weld on galvanized steel. You dont have to use all these techniques for every TIG weld.
Then remove any paint and clean up the edges so the mating surfaces fit evenly. A wire brush would also work well to quickly remove rust and stubborn paint. This can lead to a few issues like the arc not being able to strike with the layer of paint over the metal.
New steel may come from the mill with an oil coating that protects the steel from rusting until it is put to use.
For a strong weld clean the metal with a. For a strong weld clean the metal with a. If you are repairing a broken weld grind the old weld off completely. This adds two operations.