![]() ![]() What about using 308 stainless for welding chromoly?Ī. It always helps, but think about how many oxy acetylene welds there are out there doing fine that were done with no purge. ![]() Do I need to back purge my Chromoly welds with argon gas?Ī. But it is usually unnecessary unless the thickness exceeds one eighth inch. A stress relief can be done with an oxyfuel torch and a 900 degree F temp stick or a digital pyrometer. What is usually meant when it comes to welding chromoly is "stress relief". No, the term heat treat is often misused. Do I need to heat treat the weld when I am done welding?Ī. Some frequently asked questions about tig welding 4130 steel tubing are: Weld a little bit slower than you would for plain carbon steel.Ĥ. 300 degrees F if room air is below 60 degrees.ģ. Use a small propane torch to preheat weld area to about 100-150 F. Make sure the ambient temperature is above 60 degrees F.Ģ. So how do you prevent the weld area from cooling too quickly?ġ. Thats the main thing to be concerned about. If it cools too quickly, 4130 chromoly tubing will be hard and brittle in the heat affected zone of the weld. So then whats all the fuss about? Well there is one thing. There seems to be some mystique around it but it actually welds better than plain carbon steel. Welding 4130 steel tubing is not that hard. So the reason it is so popular among race car and airplane builders can use thinner tubing and that translates into speed and less weight. 4130 Chromoly tubing is used for all kinds of applications, but 2 of the main ones are for airplanes and for racing just about anything from motorcycles, to mountain bikes, to go-carts.ĪISI 4130 tubing is strong. ![]()
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