graememk
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| posted on 15/2/10 at 06:44 PM |
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welding quality
i have a roll cage from mk and i'm not sure if my welding if up to the job or not.
Here is a photo of a weld i did on some test bits that i cut off the roll cage.
 
rollcageweldb
i cut the tube, then used a off cut split down one side hammered it in the tube, then welded it up leaving a small gap between the two tubes, is that
the right or wrong way ? whats the welding look like ? its hard as i have to stop and turn the tube around, is it ok to stop and start or should it be
one long weld ?
[Edited on 15/2/10 by graememk]
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jacko
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| posted on 15/2/10 at 06:51 PM |
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If thats the best you can do forget it 
Only joking it looks ok to me
it will not fall to bits 
Jacko
I must read all your post
Yes the way you have done it is ok thats how i would do it tube down the middle
and i have been welding about 30 years
[Edited on 15/2/10 by jacko]
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graememk
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| posted on 15/2/10 at 06:52 PM |
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looks like it has tiny holes in it, is that ok ?
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bartonp
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| posted on 15/2/10 at 06:54 PM |
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The weld appears undercut at the top of the pic.
1/3 of the way down on the left the HAZ is uneven/disappears - prob lack of penetration here.
What happens if you try to break it? MIG is notorious for looking good then falling apart 
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jacko
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| posted on 15/2/10 at 07:01 PM |
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1/4 of a inch holds 1/4 of a ton how many inches is round that tube ?
yes the top dose look a bit under cut how thick is the tube wall?
What gas you using co2 ?
[Edited on 15/2/10 by jacko]
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graememk
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| posted on 15/2/10 at 07:03 PM |
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undercut.... so wire speed to slow? am i going to fast ?
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jacko
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| posted on 15/2/10 at 07:14 PM |
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Wire speed looks about right you may be a little to fast practice practice etc
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Daddylonglegs
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| posted on 15/2/10 at 07:24 PM |
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I did a similar thing with my rollover bar, I put a 12" tube insert in the joint, drilled a couple of holes each side to do spot-weld type job.
Then grooved the join and fully welded around the seam.
Hopefully I'll never have to find out if it's strong enough, but I'm pretty confident it will be.
It looks like the Midget is winning at the moment......
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Fatgadget
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| posted on 15/2/10 at 07:33 PM |
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Critical items are best left to professionals IMHO.
I certainly wouldn't trust my welding on something like a roll cage....On an axle bracket?..deffo!
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madteg
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| posted on 15/2/10 at 08:22 PM |
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Overlap on tour stop starts and allways try to go up hill where you can, but looks a lot better than some i have seen on roll cages.
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ashg
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| posted on 15/2/10 at 08:34 PM |
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its not going to fall apart but you could do with upping the wire speed a tiny fraction or slow down a little bit.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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graememk
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| posted on 15/2/10 at 10:26 PM |
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thank you very much, i'll cut it off and have another go
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steve m
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| posted on 16/2/10 at 10:16 AM |
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Dont cut it off, just grind it back , and weld it up again,
I did mine in a similar way, but had a spigot/inner sleeve made up
And welded it in
Steve
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MikeRJ
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| posted on 16/2/10 at 11:37 AM |
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quote:
Originally posted by Fatgadget
Critical items are best left to professionals IMHO.
I certainly wouldn't trust my welding on something like a roll cage....On an axle bracket?..deffo!
Not so sure about that, an axle bracket failing could easily lead to giving the roll cage a thorough test.
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jacko
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| posted on 16/2/10 at 07:33 PM |
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What part of the roll cage are you welding to join 2 straight pipes?
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