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> Vintage racer build
jhelgesen
post May 20 2010, 06:35 AM
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We started cage work for a vintage racer 914-6...

Customer brought in a decent stripped tub, fitted for a complete fiberglass fender setup.

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358902.1.jpg)

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358902.2.jpg)

We started in with the main hoop

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358902.3.jpg)

We'll be tying in all the suspension points.

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358902.4.jpg)

Trial fit the door bars last night.

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358903.5.jpg)
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sean_v8_914
post Sep 21 2010, 08:01 AM
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OT: I was watching monster truck jam. Blue Thunder hit some jumps and both rear shock consoles came apart. then they showed the carnage...WTF? it all came apart at the welds. can someone with real welding experience explain that? I say cold joints and poor penetration.
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rick 918-S
post Sep 21 2010, 08:21 AM
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QUOTE(sean_v8_914 @ Sep 21 2010, 09:01 AM) *

OT: I was watching monster truck jam. Blue Thunder hit some jumps and both rear shock consoles came apart. then they showed the carnage...WTF? it all came apart at the welds. can someone with real welding experience explain that? I say cold joints and poor penetration.


If it was 4130 it is likely poor penetration. (monster trucks likely would use light 4130) The other problem with welding 4130 is the rate of cooling. Mig welding 4130 can result in a concentrated local heating of the tubes with a quick flash cooling. This will cause a brittle condition and lock in stress. IIRC Tig welding can even be worse as the heat concentration is even more concentrated with a faster cooling cycle. In welding body panel seams tig is ideal because of the small heating and your ability to concentrate the work to a smaller area minimizing the warp factor.
That's why experimental air frames are gas welded. The molecules expand slower with the torch and further down the tubes. The tubes hold heat longer after the welding process is completed. Cooling is slower allowing the tubes to naturalize (tube and weld metal) restoring the strength.

Mild steel DOM can be mig welded with great success. It's a little heavier.
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Posts in this topic
jhelgesen   Vintage racer build   May 20 2010, 06:35 AM
JmuRiz   Looks good, but damn, you have my wall stripe idea...   May 20 2010, 09:07 AM
jhelgesen   Looks good, but damn, you have my wall stripe ide...   May 20 2010, 09:10 AM
Racer Chris   I hope you're not welding the roll cage togeth...   May 20 2010, 11:24 AM
jhelgesen   I hope you're not welding the roll cage toget...   May 20 2010, 11:34 AM
jimkelly   if you can - pls be descriptive on the install of ...   May 20 2010, 12:22 PM
quadracerx   I was wondering about those fenders and how they a...   May 20 2010, 02:09 PM
carr914   I hope you're not welding the roll cage toget...   May 21 2010, 04:16 AM
jhelgesen   I hope you're not welding the roll cage toge...   May 21 2010, 04:22 AM
quadracerx   Anyone have any suggestions on how to fasten these...   Sep 20 2010, 09:59 PM
carr914   The fact that it is a race car, I would think that...   Sep 21 2010, 04:37 AM
scotty b   The fact that it is a race car, I would think tha...   Sep 21 2010, 05:22 AM
jhelgesen   Quick release fasteners were not allowed by the sa...   Sep 21 2010, 05:46 AM
carr914   B)-->
QUOTE(scotty b @ S...   Sep 21 2010, 06:21 AM
arkitect   Keep the picts coming, want to see the process of ...   Sep 21 2010, 06:59 AM
sean_v8_914   OT: I was watching monster truck jam. Blue Thunder...   Sep 21 2010, 08:01 AM
rick 918-S   OT: I was watching monster truck jam. Blue Thunde...   Sep 21 2010, 08:21 AM
sean_v8_914   does pre heating help?   Sep 21 2010, 09:58 AM
rick 918-S   does pre heating help? Yes. No problemo. I...   Sep 21 2010, 11:36 AM
msglaigaie   I have the same fenders and I am very interested i...   Sep 21 2010, 11:46 AM
campbellcj   I'm surprised that the sanctioning organizatio...   Sep 21 2010, 11:32 PM
quadracerx   Any progress updates?   Nov 23 2010, 03:04 PM
Silverstreak   Great job on the Acura, but god I hate seeing 4 do...   Nov 23 2010, 06:45 PM
jhelgesen   I'll have to dig up the completed pictures, ca...   Nov 23 2010, 07:52 PM

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