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Author Topic:   tubing ?
37mod
Member
posted July 24, 2003 06:03 PM
what tubing are chassis builders using. CREW (cold drawn electric resistance welded), or HREW (hot rolled electric restance elded)?????
I need to replace some bars and want to get the right material.


towmandan
Member
posted July 24, 2003 09:46 PM
Ive been looking for places to buy bulk tubing and everyone Ive talked to carries HREW tubing but I cant tell you which one is better....But if most suppliers are carrying HREW tubing I bet thats what everyone is looking for....As usuall thats just my opinion...Towman


outlawstock17
Member
posted July 24, 2003 09:59 PM
DOM - drawn over mandrel - is the next best thing to chrome moly and easier to weld. DOM isn't a welded seam tube.

[This message has been edited by outlawstock17 (edited July 24, 2003).]

rocket36
Member
posted July 25, 2003 05:51 AM
DOM tube, best thing since they satarted putting beer in cans.


Dman
Member
posted July 25, 2003 01:23 PM
chrome moly tube can be welded by tig, mig or oxy(if your really keen).
all that is required is the correct filler material (wire).
chrome moly is closely related to stainless steel (you see a lot of the sprint & midget guys running chassis that aren't coated/painted and they don't rust).
TIG is by far the nicest for chrome moly but isn't essential. Alot of the CM late model frames are MIG welded.


zeroracing
Member
posted July 25, 2003 09:01 PM
hey
i just got a tig and it is not even all the way togthere literally bought it today. but anyways. any tips for welding chromoly. what should i use for filler. can i weld chromoly to steel or will it be really brittle and just break. i have a mig also but have never welded chromoly with it every car that somebody trys to weld chromoly on with a mig usually breaks off.
but anyways i was just thinking of using it for bumpers and nerfs and stuff like that.
any suggestions.
thanks


jws
Member
posted July 26, 2003 09:57 AM
Been using cm for years and am tired of hearing that it can't be mig welded, is brittle, fatigues, is dangerous etc.etc.. One of my crewmen has built and maintained airplanes all his life and is an expert welder. We mig it all the time, just like always make sure you get a good fit and use enough heat. We see a lot of mig welds made to cold. This is a crutch used for welding gaps. It does not need to be normalized, though that is the very best method. It is much stronger than electric weld tubing(cost 4 times as much). I have been told that NHRA requires cages to be .120 mild steel or .065 CM. That tells you something. The main reason CM is usually tig'd is that the wall thickness is normally very thin.


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