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3½% Nickel Steel Welding Rod was originally developed for use in the space program for achieving the best welds possible. It contains minimal impurities which contribute to its ability to flow smoothly and create a seamless, non-porous weld either with Oxy-Acetylene or TIG. This welding rod has been particularly sought by many gunsmiths who require it for welding bolt handles and other items that will be polished post-welding. A supplier of 3½% Nickel Steel Welding Rod has been located thanks to Jim Thompson of Maverick Gun Works in Topeka, Kansas.

Jim states that, "I finally located some 3½% Nickel Steel Rod and the first bolt I welded was perfect. The rod is expensive but worth its weight in gold when you are welding bolt handles and any other job where a perfect weld is desired." He suggests bringing the parts to welding temperature with a big flame, then reducing the flame to a hiss. He advises using a No. 2 tip, but clarifies that another tip might work better. He suggests taking one's time and avoiding overheating the weld, which allows one to work with it throughout the day if need be. He assures that the weld is easy to work with, machine or file, and reminds to use a neutral flame.

It's worth noting that no coding or flux appear on the part.