TurboLocost
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| posted on 22/10/18 at 04:18 PM |
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Welding...
Right I'm an agricultural engineer so welding is no trouble at all
Usually use MIG or stick depending, but have done a bit of gas cutting and welding as well in a pinch (usually used MIG as was always ready to go and
stick outside)
Now when I come to weld my chassis I will be doing it all at home, the sections I will cut where I have power (in garden for example) but the welding
I will do in my workshop....however I have no power supply!
So I will use oxyacetylene to weld up the chassis
Which got me thinking about a few things...
I dare say most on here MIG their chassis but did any of you use oxyacetylene?
And other thing, what do you guys reckon? Oxyacetylene welding, or bronze braze welding?
Ariel atom for example is bronze welded
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big_wasa
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| posted on 22/10/18 at 05:09 PM |
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Modern inverter welders should run on an extension lead.
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TurboLocost
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| posted on 22/10/18 at 05:32 PM |
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I've got a 180amp transformer MIG which I am converting to Euro torch, a small cheap transformer stick welder, and a 160amp good quality
inverter stick (which can do scratch start DC TIG if I got the leads) but my workshop is about 80 feet from the house and may annoy neighbours running
a cable across their gardens 😂
And Genny to run MIG would need to be 5kw minimum so not cheap!
Hence why thinking of gas welding...
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jimmyd
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| posted on 22/10/18 at 09:19 PM |
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If using gas I’d go for bronze brazing. Less heat distortion and I believe that’s how Caterham etc were all done. Don’t know if that’s still the case.
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JAG
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| posted on 23/10/18 at 08:38 AM |
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Yeah - main reason everyone uses MIG or TIG is to minimise distortion from the heat.
Other methods work just as well but your Chassis won't be as straight - unless you take special measures and/or are very skilled 
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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TurboLocost
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| posted on 23/10/18 at 08:44 AM |
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Mig and Tig are more localised heat but the wire is generally made so it's harder than the base metal (hence why steels tends to crack at edge
of the weld
Mig is easy as long as you have power to workshop 
Bronze welding was used for original lotus 7 and caterham before they went robotic welding, and Ariel still use it
Will have a think as only other downside to gas is welding on an MDF build board 😂
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redturner
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| posted on 23/10/18 at 11:10 AM |
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quote:
Originally posted by TurboLocost
Bronze welding was used for original lotus 7 and caterham before they went robotic welding, ;
and almost every race car ever built in the early days. Bronze welding is a brilliant way to fasten steel together, However if you have to come back
to it later you can only use gas again. Even if you grind the joint down to bare metal there will still be sufficient bronze in the joint to prohibit
MIG, TIG or stick welding. However, bronze welding does produce a joint that is flexible and less prone to cracking.....
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TurboLocost
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| posted on 23/10/18 at 01:14 PM |
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To be honest I am tempted to switch entirely to oxyacetylene
I can do welding, brazing, cutting, heating etc with one setup (well change torch etc) and no requirement for electric
I can always put thin steel plates under all joints on the MDF sheet to protect the MDF
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redturner
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| posted on 23/10/18 at 04:08 PM |
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You must put plates under the joints anyhow. This will ensure that your welding goes to the end of each run and of course if it was a steel table
prevent you from welding to it.....
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bi22le
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| posted on 23/10/18 at 09:35 PM |
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I cant comment on car chassis but I wanted to say that brazing is considered a great way to stick to bits of tube together.
I used to work with wheelchairs and all steel chairs are brazed, even the top top end ones. The joints are very flexible and dont heat treat
surrounding metal causing crack propagation.
I think they also provide a lush smooth finish as well. . .
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
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http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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40inches
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| posted on 23/10/18 at 10:32 PM |
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Brazing is to get the metal red hot and run filler wire into the joint (like soldering), Silicone Bronze welding is very similar
to TIG welding. An example of bronze welding vvvv
 
Description
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