What is the difference between erw and dom tubing

I'd go there, bring a caliper, check for roundness and visual straightness, then decide. Typically, I'd go with the DOM product if the cost is not any factor. Regarding your welding application: These are all low carbon, DOM may be with no difference between the two. Post some pictures when you are done!! By swnorris Date DOM will have a better finish, as indicated by Bill.

It seems the answer is to sand some paint off to check, but is this confirmed? Unless you want to drag around ultrasonic or x-ray equipment, a visual inspect is the only way to know for sure. Either remove the paint gently so as to not disturb the surface too much or cut a piece of the tubing and look inside. In theory, you could feel the seam of ERW through an inspection hole with a pick if the seam saw on the opposite side of the tubing from the hole.

Based on how the tubing is made, this makes sense.. Basically it seems like DOM would be a harder requirment to enforce. Thanks for the info! RogueLeader's Website. I found that picture with only a couple of minutes searching trying to find a rollcage crushed in the way that I was describing answering the question about wanting the tubing to be twice as strong.

If there was someone buckled in that seat correctly, they have a broken neck. Note that the front tubes aren't triangulated Looks like it hit a tree inverted. You are not logged in.

Please login or register. Pages 1 You must login or register to post a reply. RSS topic feed Posts: Tuesday, August 25, My question: What are the chances of roll cage requirements increasing in the future? Jay's Response: Cages: a I don't plan on going to DOM at the moment, but as soon as some idiot crushes himself with a seamed cage, you'd better believe our insurer will make us go DOM.

So I encourage teams to strongly consider a cage like an Autopower or Kirk. Captain Team Super Westerfield Bros. Jim "Endo" Anderton 30 years of racing and still not Brambilla We got the curse at Capitol Offense but they wouldn't let us destroy the car. Jump to forum: Lemons Classified on RacingJunk. Page created in 0. The strip is cold formed and passed through an electric resistance welder which joins the edges together, under pressure, to complete the tubular shape.

After testing the weld's integrity, the tubing is cut to length for further processing. The cold-drawing process creates a uniform, precision product with substantially improved tolerances, surface finish and tensile strength, increased hardness and good machinability. In this process, the tube is cleaned and annealed, and one end of each length is squeezed to a point so it can be gripped by the drawing mechanism.

The tube is then drawn through one or more dies and over mandrels. This reduces the diameter of the tube and thins its walls to the required dimensions in a controlled fashion to provide the qualities desired in the finished product.

Metallurgically, drawing improves the tube's concentricity, tensile strength, hardness and machinability. Close dimensional accuracy is achieved through tight control of both outside and inside diameters.