A friend wants me to fix a "sculpture" thet he has where a weld cracked. Looks like some sort of scale or something that is part of a larger piece. I suspect it was MIG welded with a cold weld as what he describes should not have caused it to break. Anyway I plan on TIG welding it. Part of the uniqueness of the part is it is completely covered in rust. Obviously, I have to clean this up to weld it. After I am done, how can I promote rust to take it back to its original appearance. I will clean as little as possible. I'm sure ther must be some way other than dampness and time. Any advice?
Thanks in advance. Barry