4130 TIG welded and powder coated.

admin

I'm aware of stress relieving chromoly tubing after welding, but here's a question to think about. Now most of the parts that I manufacture are TIG welded and then powder coated. Some of the parts that I make out of 4130 are sway bars and control arms and some smaller cars tube chassis. If the part are heated to 400 degrees Fahrenheit (thats what the temperature of the metal should reach and not just the ovens air temperature) for about 10-15 minutes. How much stress relieve does that do as heat is applied evenly to the whole part and not just around the weld area? Would it be enough to not have to do it prior to powder coating?
Reply:I should probably also mention this is welding it with ER70S-2 filler. I hope that I'm jumping on this forum and asking way too technical questions . As I mentioned in my first thread, I just really like to know exactly what happens to better understand the weld strength limitations.Last edited by dj55b; 05-14-2011 at 09:16 PM.
Reply:Sounds like your weldments are thicker than 1/8" which may not require stress relief.Typical stress relief temp is 1200 degrees F. and sustained at that temp for 1 hour.Powdercoat temp and duration is not near enough to affect the mechanical properties of your weldments.
Reply:Typically when 4130 is welded with er70s-2 or er80s-d2 it wasn't meant to be stress relieved, If you have inentions of stress relieving you should use 4130 filler. I'd carry on like you are now and not worry about it.
Reply:Thanks for the reply back, Its not about the intention of stress relieving, it was more of a question I've always kinda wondered about thats all. Why would you say that 1/8" or thicker doesn't require stress relieving (not taking just about ER70 now but in general? I thought the general consensus was if that filler required stress relieving then it should be done throughout the whole range, and not just a specified thickness of metal.
Reply:Originally Posted by dj55bThanks for the reply back, Its not about the intention of stress relieving, it was more of a question I've always kinda wondered about thats all. Why would you say that 1/8" or thicker doesn't require stress relieving (not taking just about ER70 now but in general? I thought the general consensus was if that filler required stress relieving then it should be done throughout the whole range, and not just a specified thickness of metal.