Mig welding 4130 ? 1

[sprintcar]

Currently TIG welding 4130, sch N chrome moly tubing with wall thickness of .090" and .058". Joints are notched for good fit up. We would like to look at MIG to speed up the process.

Comments? Also any recommended wire, gas and starting Amp /speed / feed settings you could share. THANKS!

 

Ever think of explosively welding? The process can be used to weld almost an metal to any metal with no PWHT or change in strength due to a HAZ. The bond strength is as high as the metals themselves and lend themselves to tubular geometried.

 

[sprintcar]

Somehow I think the +/- 0.030" tolerance and placing tubes within a framework would not lend itself to that. The idea is to save time and cost.

 

[womble]

Hi,

Check out this address. Should give you most of what your after.

http://www.lincolnelectric.com/knowledge/articles/content/chrome-moly.asp

 

[WKTaylor]

Sprintcar..

I suggest You be very cautious about wanting to speed-up the joining process.

IF You are joining dissimilar thickness tubes probably at odd orientations with critical performance issues [IE: crash-worthieness], You will want to stick with TIG. TIG provides the opperator precise control of inert gas-coverage, arc formation, metal fill and PW cooling... essential for joining 4130 in stress-critical applications.

NOTE: In aviation, we use TIG for all aircraft critical parts... such as engine mounts and seat-frames... and MIG for welding tooling fixtures/jigs/support equipment etc.... Regards, Wil Taylor

 

[sprintcar]

Thanks Will
I was asking on behalf of the builder. I have seen MIG on these frames and it looks risky!!
Mine is TIG and will stay that way!