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Baja Forums -:- VW Volkswagen Bug, Baja, Bus, Sandrail and Thing -:- VW Volkswagen & Baja Bug General Discussion -:- race frame
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race frame
Bug, Baja, Thing and Buggies. Most every thing that will not fit any any other area. See list of other Forums for better topic placement...Volkswagen General Discussion
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69bapbaja
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Post Post subject: Re: race frame
Posted: Sun Jul 16, 2006 08:40 PM
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when you weld you get hot and cold area's this become's "stress points"
when you re heat the area cherrie red and let it cool naturaly it looses the "stress points" and relaxes the metal.


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speedtrash
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Post Post subject: Re: race frame
Posted: Mon Jul 17, 2006 11:31 PM
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does steel build these stress points?


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Post Post subject: Re: race frame
Posted: Mon Jul 17, 2006 11:53 PM
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When you weld chromoly tubing, your fastening it together, there by removing the ability to "relax". it needs to relax due to being hot then cold in such small areas as only a small part is being affected. Bending chromoly tubing also requires heat de-stressing cuz when you bend it, your streching half of the tube more than the other half. chromoly tubing has a spring steel quality about it which makes it stronger, but also trickier to fabricate with. Did I loose you yet? Hope not. And i want to add, this is based on my own experience of fabrication and not factual.


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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 06:44 AM
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is chromoly considered a steel?when welding with metals other than chromoly, will they build these stress points?


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bajasam96
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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 06:51 AM
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Chromoly IS steel, its just special


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speedtrash
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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 06:53 AM
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so would you have to stress relieve any steel frame you weld on?


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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 06:54 AM
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no


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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 07:01 AM
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sweet!


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kevin
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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 07:44 AM
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when you weld steel together it shrinks. on small frame assemblies you may want to go back and "relax" a few areas as the guys suggested, but with te proper design and assembly the welds should not FAIL at any point. tubing has to be "spliced" together properly in straight areas. joints ahve to be cleaned and formed to match the aligning angles to prevent gaps. if your assembly is layed out for a "dry" run, you would be able to find any "loose" ends before final welding.

also use a 230vac welder. the 120vac units splatter more. use gas (requires welder that is set up for gas) with the proper core for cleaner and stronger joints.

still need more info? go to home depot and get the weling book in the tools area.


or go here:

www.lincolnelectric.co...xcored.asp

www.muggyweld.com/steel.html

www.aussieweld.com.au/...page12.htm

www.thefabricator.com/...fm?ID=1030

(this one shows a race car frame)
www.ctsshifterkarts.co...turing.cfm

www.millerwelds.com/ed...efits.html


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speedtrash
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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 08:27 AM
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great sites (they'll soon come in handy), i have a lincoln-electric pro-mig 135. it has the gas outlet in back(all i need is a bottle to gas it) on most applications flux-cored does me well, but for a frame i'd drop the cash for a bottle. i've used shielding gas before, and damn i can make some pretty welds.

you know, writing this post reminds me how much i like to weld, and it sounds like we have some knowledgeable metal fabricators. we should have a custom project forum to discuss such things as fabricating parts, shortening/lengthening bajas, welding and similar. we could do this in the sandrail section but i think it'd be better to set-up another forum.

what do you guys think?


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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 03:34 PM
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use argon, leaves sweet lookin welds. I ve done custom copper and aluminum work with it and it just looks bad ass.


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speedtrash
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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 08:18 PM
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yeah, what i've used in the past is half argon/oxygen, as far as shielding gas goes there's different mixtures for different metals. and they all allow for really nice welds.


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Post Post subject: Re: race frame
Posted: Tue Jul 18, 2006 08:54 PM
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what you really want to use for all general steel is a 75/25 mix.

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