Tubbing difference between RHS and ERW

[skyrob99]

Hi guys, thank for all your help on my previous posts,

Well now I am trying to figure out whats the difference between RHS and ERW, since people on the steel shops is telling me they only have RHS, and the plans say I have to use ERW.

Which one is better for building a frame?

Sorry if the question is so basic (maybe stupid) but well I am trying to figure out.

Thank you all

[kevlar129bp]

"Rectangular Hollow Sections" as opposed to "Electric Resistance Welded"... Nearest I can tell, one is a product section description and the other is a manufacturing specification. To make it a little more confusing, you could have a RHS ERW tube....

Hope that helps?
Kevlar

[K-fab]

Tell them you want DOM (drawn over mandrel) tubing.

[kevlar129bp]

Everything you wanted to know, but were afraid to ask...
Pirate4x4.Com - Extreme Four Wheel Drive
Good stuff there.
Hopefully not to add to any confusion

Kevlar

[skyrob99]

Great... really thank you very much....

Well I just called one guy from the steel shop and he told me that he does not know the manufacturing process of the steel in the case of the ERW which according to my badland ST4 we have to use for the frame.

Ok here is the deal the guy told me that I have to go and see the materials they have,
How can I tell the difference or choose the best material for my frame/cage?? if the sellers are not aware of the merchandise they are selling...

I do not want my cage to do what the unstoppable STX400

Originally Posted by standfast

400cc buggy

Watch the video.

Really I would like to do things the right way, and our main priority is not to compromise our safety, that is why I am asking so many questions..

Best regards..

[dunerocket]

Where are you located? Perhaps someone here can point you to a good supplier in your area.

If the shop you are trying to use doesn't know what they have, I wouldn't even consider buying from them. Any reputable shop can supply you a copy of the original mill ceritification for the material.

You definitely want DOM.

[nutz4sand]

Yah on the DOM. You can safely substitute DOW for ERW as its a better tube. You may pay a little more for it but its not money spent badley.

You can still use a little cheaper ERW for small braces and such. But DOM would be the better choice for the main parts.

[K-fab]

Originally Posted by skyrob99

I do not want my cage to do what the unstoppable STX400

Thank goodness!!!!

Originally Posted by skyrob99

Really I would like to do things the right way, and our main priority is not to compromise our safety, that is why I am asking so many questions..

Best regards..

Ask away - that's what this place is all about.
It's really killer to see someone thinking about safety right off the bat too.

Tell your local metal supply house that you need 1018 or 1020 mild DOM tubing. It generally comes in 20' to 24' long sticks.

If they can't get it, there's something wrong with them. This is a pretty easy thing to find.

You can build the entire car out of 1018 or 1020 mild and not have any issues. It's easy to work with, welds beautifully and will do the job just fine.

[jumpin jellybean]

they don't even know what they are selling find a better supplier, and after reading up on this site K-Fab nailed it just my $.o2

[standfast]

So this brings up a question I have wondered about. Can a strong safe car be built out of ERW? What is the strength difference between a DOM and a ERW tube? How much easier to bend it etc? I have seen a bunch of people using ERW. Both the Sinister cars in my shop are 1.25" .120 wall ERW. Yoshi, are all your car's ERW? Looks like the a-arms, trailing arms are the same material? I guess with enough bracing it can work?