![]() I believe you would get away with using a 309L stainless, but you could use something like Inconel 82 (ERNiCr-3) if you want to be doubly sure. You can easily do this with a small propane torch from Home Depot. If the ambient temperature is less than 60 F, I would say preheat to at least 100F. ![]() Preheat is not necessary for tubing under. The filler that you use would probably be the same for a stabilised grade, or a non-stabilised grade. In a nutshell here are the 6 main things to remember when TIG welding 4130 chromoly tubing: 1. A L grade of stainless will take this heat treatment cycle without sensitization, as would a 347 stainless. The PWHT temperature of this material (Cr-Mo) is typically in the 600 - 750☌ range. (Cr-Mo Steel) In addition, if the weld is in any way a load bearing component, then the Cr-Mo would also want to be Post Weld Heat Treated (PWHT) while the stainless does not particularly like this. You are welding a material that likes to be welded cold (Austenitic S/Steel) to a material that likes to be welded hot. None-the-less, the welding issues remain pretty much the same. A wide range of properties are available, depending on the heat. What I am saying, is that you would probably be OK using a L grade such as 316L or 304L. An example is AISI/SAE 4130, a chromium-molybdenum (chromoly) medium carbon alloy steel. By stabilizing the stainless, it was weldable without the big sensitivity problems associated with non-stabilised grades of the day. Most probably, the reason is that in the days when this aircraft was built, there were no "L" grades of stainless around. If the drawing specifies a stabilised stainless steel, there could be a number of reasons for this. ![]() You say that the application is on an antique aircraft. ![]()
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