Welded Tubing, or is it?

[bear Foot]

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[b.c.bugger]

I'm not sure what you mean, almost everybody on this site is using welded tubing. Unless it is pierced rod it is welded.
Sucks that you found cracked welds though

[Ant1Xr1st]

bear Foot, u haven't seen what metal are selling in Russia
as my friend says: -"It's made of a very rare alloy of cardboard with foil"
Sorry 4 my engish

[yoshi]

Originally Posted by bear Foot

So your thinking of fabricating something for your Buggy?
Choose your material carefully.

You've heard never use welded tubing for safety cages, frames, etc.
I bought some tubing this weekend and look what I discovered. Cracked welds.


This is 2"x2"x.250"

Check out the Photos

Try to find anyone who used non welded tubing, and that goes for trophy trucks, stock cars, sprint cars, nascar, NHRA, etc. etc. etc.

Anyone you do find that uses a non welded material will not be in an automotive purpose, the cost is just too high....

[bear Foot]

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[Bugpac]

Dom is not seamless. it only removes the weld as it goes across the mandrel..

[yoshi]

Originally Posted by bear Foot

I'm was going to use this on a tubing bender. The plans call for a 10 ton ram.
The instructions have a warning, to place the tube seams in a specific places. That tells me they know it can come apart.
If I could find DOM 2x2x.250, I'd use that.

"trophy trucks, stock cars, sprint cars, nascar, NHRA,"

Your right, you will find ERW tubing in parts of it. But I think you'll find life safety devices such as cages, will be DOM, seamless tube.
Here's an example from the SCORE rules ....

"CR33 ROLL CAGES"

"All vehicles in competition except Motorcycles and ATV’s must be equipped with a roll cage. Minimum design and tubing size based on seamless 4130 chromoly tubing or ASTM 1018/1026 CDS/DOM."

The whole reason I started this post was to let others know to check their material.

as stated, chromo and DOM are welded, seamless only means the manufacturer has gone through and removed the visible aspect of the weld, the weld is still there, just not visible.

And i'm not saying your recommendation to check tubing is wrong, only that the tubing being used by professionals is not welded, which it is.

And although it is a good idea to put the seam on the inside where it is less stressed, the main reason benders say to do it is because if the weld has not been machined smooth, it will dig into the die as it slides across it. I had an employee trash a set of dies because they didn't pay attention to where the seam was, and the result was the gouges tore up any further tubing I ran through the bender...

[bear Foot]

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[yoshi]

Originally Posted by bear Foot

Boy,
I'm sorry I started this post. It wont happen again.

no need to get all pissy, we didn't knock you telling people to check their tubing, but you were under the impression that seamless means not welded so we corrected you. Would you prefer it if people didn't correct you when you had wrong info?

[millfab313]

I THINK IT IS ALL GOOD INFO AND I LIKE READING THREADS LIKE THIS AND GETTING EVERY ONES MINDS THINKING. MAN I LOVE THIS SITE, THE GOOD THE BAD AND THE UGLY.