A good welder will know exactly what to do to weld cast....they do it all the time. In the case of cast, you heat the metal to a certain temperature (I think it was around 450°) and use a particular rod. Again, a qualified welder will know all this. If you go to one of the trailer manufacturer/repair places in your neck of the woods, they will know exactly what to do. Just bring the lunette....you don't need to bring the whole gun.
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