DOM vs. Moly

Jaydog · Mar 30, 2009

Bunk said:
Or a ss chassis...that would be blingin

That would be

Perfect for the NW

pbmcauliffe · Mar 30, 2009

A lot of the Alston Chassisworks kits are available in HREW and DOM, as well as chromo.

DHR Motorsports · Mar 30, 2009

bobbed_84_toy said:
nobody huh? So you're saying they're all moly?

HREW or moly as chop shop stated.

DHR Motorsports · Mar 30, 2009

pbmcauliffe said:
A lot of the Alston Chassisworks kits are available in HREW and DOM, as well as chromo.

You can get them in DOM but the SFI only recognizes moly or mild steel

DOM to them is the same as HREW when certing the chassis.

TigTorch · Mar 30, 2009

The roll cage benefit of DOM or 4130 is not about the alloy. The benefit is in how both tubes are rolled at the mill. In either case the tubes are are extruded to a greater degree and at higher temperature. This produces a very fine grained piece of tubing. The fine grain makes the tube extreemly tough and crack resistant. It is more dificult to kink and collapse these tubes than a hot rolled electric welded tube.

If you ever get the chance, throw a similar sized piece of either in the press, the vise and work it over with a hammer. You'll become a believer.

Regarding the concern over post weld annealing 4130. Some years ago I sent away to the American Welding Society for a pamphlet they published on welding this alloy. What the AWS said is that the alloy will cool to the normalized condition and no weldment annealing is required unless: the material is 2" thick or greater or the material is below freezing temperature when its welded.

DHR Motorsports · Mar 30, 2009

TigTorch said:
The roll cage benefit of DOM or 4130 is not about the alloy. The benefit is in how both tubes are rolled at the mill. In either case the tubes are are extruded to a greater degree and at higher temperature. This produces a very fine grained piece of tubing. The fine grain makes the tube extreemly tough and crack resistant. It is more dificult to kink and collapse these tubes than a hot rolled electric welded tube.

If you ever get the chance, throw a similar sized piece of either in the press, the vise and work it over with a hammer. You'll become a believer.

Regarding the concern over post weld annealing 4130. Some years ago I sent away to the American Welding Society for a pamphlet they published on welding this alloy. What the AWS said is that the alloy will cool to the normalized condition and no weldment annealing is required unless: the material is 2" thick or greater or the material is below freezing temperature when its welded.

Thanks Tig...

That is what I was trying to put into text but couldn't figure out how to word it.

Do many people build cages out of moly for wheeling??

bobbed_84_toy · Mar 31, 2009

DHR Motorsports said:
HREW or moly as chop shop stated.

pbmcauliffe said:
A lot of the Alston Chassisworks kits are available in HREW and DOM, as well as chromo.

Not as common, but still used. There's a dom cage in my luv and my old man's 'camino. No need for chromo and not a fan of hrew

DHR Motorsports · Mar 31, 2009

bobbed_84_toy said:
Not as common, but still used. There's a dom cage in my luv and my old man's 'camino. No need for chromo and not a fan of hrew

SFI only sees DOM as mild/HREW. To them they are one in the same.

They only see moly and HREW when certing a chassis.

bobbed_84_toy · Mar 31, 2009

DHR Motorsports said:
SFI only sees DOM as mild/HREW. To them they are one in the same.

They only see moly and HREW when certing a chassis.

yeah and? Still no need for chromo and still not a fan of hrew. That leaves me with dom

DHR Motorsports · Mar 31, 2009

bobbed_84_toy said:
yeah and? Still no need for chromo and still not a fan of hrew. That leaves me with dom

I guess my point is if the SFI doesn't recognize DOM and they do moly why don't more off road guys use moly when you can get a lighter product that has the same strength....???

nevada · Mar 31, 2009

DHR Motorsports said:
I guess my point is if the SFI doesn't recognize DOM and they do moly why don't more off road guys use moly when you can get a lighter product that has the same strength....???

i think its already been said a few times.....money.:awesomework:

Bunk1 · Mar 31, 2009

JESUS FAWKING CHRIST YOU DRAGRACER. Your on a wheeling site.

OK..im calm now...Ive only heard of a handfull of chromo chassis being built for rock rigs. We beat the crap out of em and replace tube so dom is much easier all the way around to repair.

Are you asking the question because yer building a rock rig or cause you want to:stirpot:

DHR Motorsports · Mar 31, 2009

Bunk said:
JESUS FAWKING CHRIST YOU DRAGRACER. Your on a wheeling site.

OK..im calm now...Ive only heard of a handfull of chromo chassis being built for rock rigs. We beat the crap out of em and replace tube so dom is much easier all the way around to repair.

Are you asking the question because yer building a rock rig or cause you want to:stirpot:

Actually I was asking because alot of the welds I see on stuff being built look less than beautiful and I don't see many TIG welds.

That being said I was curious why very few use moly but now I gather it is cost and that it has to be tig welded.

I am starting to overhaul my CJ and was thinking of moly as the stuff is lighter than mild or DOM and it just seems like a higher quality finished product when you use moly.

Lighter and stronger is always good.

Bunk1 · Mar 31, 2009

DHR Motorsports said:
Actually I was asking because alot of the welds I see on stuff being built look less than beautiful and I don't see many TIG welds.

That being said I was curious why very few use moly but now I gather it is cost and that it has to be tig welded.

I am starting to overhaul my CJ and was thinking of moly as the stuff is lighter than mild or DOM and it just seems like a higher quality finished product when you use moly.

Lighter and stronger is always good.

You can lead a dog to water.....

darius · Mar 31, 2009

DHR Motorsports..... After reading your last post I've fully decided your dumb. Drag racer's are one time use and you are building inside a shitty shaped car. You obviously have built something that somebody thought was good and you've now brought that ego here. Got new's for ya buddy DOM is more than fine, chromo is somewhere around a 10% increase in strength vs DOM in an identical comparison, that's not much vs the cost difference.

Here's a few pictures of a Dodge pickup that tumbled at 70, it's trailer and a shitty DOM buggy that started out tied to the trailer....7 roll's later.....other than the broken wheel it was fine to drive away from the accident site.

Money Mark · Mar 31, 2009

Bunk said:
You can lead a dog to water.....

No, that's a horse.....dogs, you beat.:whip:

Binder · Mar 31, 2009

DHR Motorsports said:
I guess my point is if the SFI doesn't recognize DOM and they do moly ....???

And everyone elses point is nobody cares what SFI thinks.
I still don't believe cromo is stronger without proper heat treating unless someone can provide documentation showing so.......:corn:
Stronger or not it's not necessary, that's a fact!

Broken Again · Mar 31, 2009

Bunk said:
Most excellent. If you treat it then yer twice as strong as dom, But heat makes stuff move and doing a chassis would be insanely expensive.

I got to wondering a few years ago, Dustin Webster had a new chassis tigged up from chromo but he didnt treat it...was it too expensive to have it treated, or what...got me to thinking why.

Dustin lives about 1/2 mile from me, about 2 miles the other way is a heat treating place that could easily do a rig. They don't even charge that much. Problem is that you would need a jig to keep it from tweaking and the jig would be hughly expensive.

DHR Motorsports · Mar 31, 2009

darius said:
Here's a few pictures of a Dodge pickup that tumbled at 70, it's trailer and a shitty DOM buggy that started out tied to the trailer....7 roll's later.....other than the broken wheel it was fine to drive away from the accident site.

Nowhere in ANY post have I said DOM is shitty so you should get some glasses. I was just curious as to why other than cost moly isn't used.

I see you are quick to speak without checking facts.

Those pics of the rolled truck and buggy show DOM's strength and thats great. I was just wondering why if you could get the same strength in a lighter material why it wouldn't be used more often and you fail to see that point.

The only answer I get is cost but with people spending $50K plus on a buggy then the extra cost for moly seems like pennies to me.....

82toyomud · Mar 31, 2009

Binder said:
And everyone elses point is nobody cares what SFI thinks.
I still don't believe cromo is stronger without proper heat treating unless someone can provide documentation showing so.......:corn:
Stronger or not it's not necessary, that's a fact!

We have done weld tests using 1020 and 4130 tube on one of the MTS machines here on campus, and the 4130 came out much stronger than the 1020. None of the samples were post weld heat treated, and both samples were tig welded.