welding Mild steel to Chromemolly roll cage

[samuel joff]

They'd probably think it's awesome because it's different. My friends are fearless, for some crazy reason....

May be different. But different things aren't awesome always.

[Michael ray]

Makes me wonder....we must have some of the same friends

[ryanjones2150]

They'd probably think it's awesome because it's different. My friends are fearless, for some crazy reason....

[Michael ray]

Tig it real nice then melt some brazing rod on it and tell your buddies you brazed it...see how many are willing to ride with you.

[ryanjones2150]

Kind of figured there wouldn't be much difference.

[racerx]

Don't sweat it, not nearly as life changing as it sounds. Chromoly and mild steel are successfully welded all the time. The smaller the pieces, the less likely you'll need any pre or post heat. I'd say tig it for sure and take your time. The reason for pre and post heat is so it doesn't cool too rapidly. If the parts are small, it will most likely heat up the rest of the part away from the weldment that it won't be an issue. You can use whatever mild steel tig wire you have and pure argon. I have never migged chromoly to mild steel, but I'd imagine it's the same deal for that, normal mild steel wire and the appropriate gas for that wire.

I have actually flux core some molly/ms before(it's all I had at the time)and it held up fine.As a matter of fact this is the joint that's getting cut off and re-welded due to the new rack system being installed.

[racerx]

Thaxs fellas got to refill the bottles tomorrow and get some wire from the supply store anyway, I have the small bottle for argon think i'm going to get a bigger bottle that little bottle does not last long.........Thaxs

[ryanjones2150]

Don't sweat it, not nearly as life changing as it sounds. Chromoly and mild steel are successfully welded all the time. The smaller the pieces, the less likely you'll need any pre or post heat. I'd say tig it for sure and take your time. The reason for pre and post heat is so it doesn't cool too rapidly. If the parts are small, it will most likely heat up the rest of the part away from the weldment that it won't be an issue. You can use whatever mild steel tig wire you have and pure argon. I have never migged chromoly to mild steel, but I'd imagine it's the same deal for that, normal mild steel wire and the appropriate gas for that wire.

[Michael ray]

If it's steering I'd probably tig with pre and post heat..I do mig it all the time but on less important systems than steering. No problem with mig, I use 030 and 035 wire mostly. As for gas I just use 75 25 mix on the mig...pure argon on tig.
Shaft from column to box/rack or from unit to wheel knuckle? Forces are much lower on the column shaft so I wouldn't be afraid either way

[racerx]

Not meaning to hi-jack this thread,but sense were on this subject of molly/mild steel.I need to weld a molly steering joint to a mil steel shaft.What gas/wire will this require?...........Thaxs

[Michael ray]

Quite often to be honest...

[Michael ray]

See me standing in my old zookie...good enough for most maneuvers but have the occasional back fire from time to time

[ryanjones2150]

Well, are you a good driver?

[Michael ray]

Roll cage??? I Got a 46 willys jeep with just a rusty windshield frame and a boosted lt4 and t56. Looks like I gotta get on board with one of those...probably going to weld 4130 directly to my frame...got pIles of 4130 and been welding to mild for long time on many projects...only 1 failure but thats a whole different story... i weld about as good as I drive if that means anything

[FABMAN]

Thanks guys.. after looking at some pics of the installed roll bar, the welded joints are definitely mig welded and we are now 99% sure the cage is mild steel, so the supports we're adding which are also mild steel will get mig welded.. wish i could get my tig machine to his shop, but mig it is.. thanks again