I played oxy welding, and TIG welding a little bit (not on guns, but on scrap steel). Oxy turned out being the hardest one to play and it's not a good choice. Talking about neat and quality, TIG can be great, no flux and super clean, and most important, it's a very confined process.
All low melting point filler metal that I have seen are not steel. Copper, silver, tin, etc, I am trying to image the end results..... cannot be too good.
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