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Gas torch

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Tom S.

10-25-1999 18:30:14




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I am considering buying a Oxy/acetelyene torch kit. I would be using it to restore an old truck. Not much welding is needed, perhaps about 20 lin ft of body metal, the frame has been cracked completely apart on one side and there a couple of area along the top and bottom of the frame members that should be cut out and new sections welded in. The side wall of the frame is good except for the crack. To do a good job of rust removal and welding I plan to take the truck all apart and weld and then sandblast where needed. I would also use the gas torch to heat bolts and nuts, etc., for there removal. Can some advise me on whether a Gas torch is a good versatile piece of equipment to do all these types of work. Thaks for your help.

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rod

10-28-1999 11:46:36




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 Re: Gas torch in reply to Tom S., 10-25-1999 18:30:14  
Here is a real shocker a company that has a real gasoline oxygen torch set up no joke I found this site while surfing try www.petrogen.com I was really astonished anyone have any comments.

rod



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Gas is Legal..

10-26-1999 18:03:13




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 Re: Gas torch in reply to Tom S., 10-25-1999 18:30:14  
All: Its legal and common on most small aircraft to use oxy\acy for welding the frame.. has been since the beginning back 90+ years ago..That record should prove gas can be safe & strong. Must be extended reasons for not allowing autos in certain states to have gas welding..Maybe too many sub standard "tack it together and sell it" types in the used car market compaired to the many rules(and inspections) to follow in the aircraft industry.. I am not for or against..just pointing out the great record gas welding has had for 90+ years in light aircraft industry.. best ta all...harvey

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big fred

10-27-1999 07:35:51




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 Re: Re: Gas torch in reply to Gas is Legal.., 10-26-1999 18:03:13  
Like most laws, a law prohibiting gas welding on vehicle frames probably has more to do with appeasing some special interest than it does with public safety. My guess is that farmers and other individuals were welding vehicle frames instead of having a dealer weld them. One guy probably made a bad weld, truck frame split and the accident killed someone and the truck dealer's lobby used it as an excuse to push for a new law to restrict everyone's freedom.

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Burrhead

10-27-1999 17:37:49




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 Re: Re: Re: Gas torch in reply to big fred, 10-27-1999 07:35:51  
Big Fred-----I checked on this once upon a time. The vocational teacher here checked with the state for me. This was on structure steel we were doing and not a vehicle frame
They claim that the reason is that gas welding is such a higher temp than electric that the integrity of the metal breaks down more from gas, and the welding agent is weaker, there by causing more of a safety problem than electric.
I couldn't argue either way, I'm just telling what he told me.

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JimC

10-26-1999 12:43:22




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 Re: Gas torch in reply to Tom S., 10-25-1999 18:30:14  
In my home state, it is illegal to weld on a frame with oxy/acc torch. If you are going to restore a truck, you will need a torch for numerous other areas, but if welding on frame, use stick, mig, or tig, but only if you know what you are doing.Learn welding on the parts that can't kill someone!



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Steve

10-26-1999 05:53:59




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 Re: Gas torch in reply to Tom S., 10-25-1999 18:30:14  
Hi Tom,
You can weld some vehicle frames. Not with oxy/acet. however. Also, newer vehicles with unibody frames are illegal to weld on. They can only be straightened or replaced. That's what my auto body customers tell me. Race car frames are 4130 chrome moly just like aircraft tubing. Pros use the TIG (GTAW) to achieve joining this type of material. The old truck frame you have can be joined by either stick or wire. The proper procedure requires correct reinforcement such as a fish plate and the correct filler metal is needed to insure that elongation in the heat effected zone and the weld is not compromised. A novice should not attempt it. The torch set you have your eye on could be an asset for heating, bending or brazing in regard to this project. Many people thought they could dispose of the old gas axe after buying a plasma cutter. Try to heat and bend something with a plasma cutter. Hope this helps.

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DC Dale

10-25-1999 20:02:27




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 Re: Gas torch in reply to Tom S., 10-25-1999 18:30:14  
I would never even consider welding a truckframe with oxy/acet equip. In my experience, anything thicker than 1/8 " is done with an arc welder. Actually, it isn't a real good idea to weld a frame crack that long. Is the truck terribly rare? Might be better to find a parts truck and switch frames..... You will need the torch for cutting and loosening frozen fasteners, as well as sheet metal repairs.

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Tim(ny)

10-26-1999 05:26:46




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 Re: Re: Gas torch in reply to DC Dale , 10-25-1999 20:02:27  
People weld race car frames back together all the time, and a gas weld is as strong as an arc weld, IF PROPERLY DONE. That's the key, you need to learn the skill. Arc welding is certainly easier to learn than gas, and gas welding gets harder as the material gets thicker. If you can only afford one hot wrench, I believe a torch is the most versatile. You'll never give it up, once you have one. If you plan to weld something that will be between your butt and the highway at high speed, I'd look for an adult education course, or at least find a knowledgeable advisor and practice, practice, practice. Just my opinion, based on my limited similar experience.

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CHUCK DAVIS

10-27-1999 20:41:32




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 Re: Re: Re: Gas torch in reply to Tim(ny), 10-26-1999 05:26:46  
In the hands of the inexperianced a gas torch for welding is a disaster waiting to happen.Gas welding is much more difficult than stick or MIG. Learning to set the torch properly in itself is tricky.Gas welding is pretty much a lost art,I weld for a living and rarely do it more than a couple times a year. Use your torch for burning and heating stuff,get a MIG or Stick machine for welding. Practice alot. If you have a difficult job or are unfamiliar with the metal get a guy like me to do it,we enjoy showing off our skills and more than likely will do it cheap or for free!! c.d.

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