02GF74
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| posted on 28/7/10 at 01:37 PM |
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my MIG welding idea TM
Normally we MIG weld two items that a clamped together but has anyone used two earth clamps, one on each item?
This will remove the need to firmly clamp the items against one another for a good path to ground since the earth clamps will do that.
Good or bad idea?
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BenB
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| posted on 28/7/10 at 01:41 PM |
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I'd say a good idea! 
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Gav
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| posted on 28/7/10 at 01:45 PM |
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You need to secure both parts to stop weld distortion pulling the items askew, unless of course you dont care about distortion!
I think, you think too much 
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02GF74
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| posted on 28/7/10 at 02:27 PM |
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distortion correction tool = big hammer
one of two ways - either have a second clamp bolted to the main clamp, or have two clamps on a piece of fat cable to attach to each piece.
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Madinventions
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| posted on 28/7/10 at 02:32 PM |
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Yep - I did something similar when I had to weld some large plates together that were too cumbersome to try and clamp. I propped them in place with
loads of bits of wood etc, and then connected them together with jump leads. Earth clip on one side, and weld away.
Mojo build diary: http://www.madinventions.co.uk
Solo music project: Syrrenfor http://www.reverbnation.com/syrrenfor
View my band website:
http://www.shadowlight.org.uk
http://www.eastangliankitcars.co.uk/
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interestedparty
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| posted on 28/7/10 at 02:38 PM |
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Cant see you would need it, as soon as you start welding the current will flow along the weld itself
As some day it may happen that a victim must be found,
I've got a little list-- I've got a little list
Of society offenders who might well be underground,
And who never would be missed-- who never would be missed!
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Agriv8
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| posted on 28/7/10 at 02:41 PM |
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normal to tack first measure / check this tack will conduct for the rest of the weld ?
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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Madinventions
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| posted on 28/7/10 at 03:13 PM |
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I've found that good solid earthing on both sides can help the first tack welds on larger stuff.
Ed.
Mojo build diary: http://www.madinventions.co.uk
Solo music project: Syrrenfor http://www.reverbnation.com/syrrenfor
View my band website:
http://www.shadowlight.org.uk
http://www.eastangliankitcars.co.uk/
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interestedparty
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| posted on 28/7/10 at 03:34 PM |
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How big a gap are you leaving between the 2 pieces, sounds like too much to me.
As some day it may happen that a victim must be found,
I've got a little list-- I've got a little list
Of society offenders who might well be underground,
And who never would be missed-- who never would be missed!
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v8kid
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| posted on 28/7/10 at 04:03 PM |
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I use a 12mm plate as a welding table connected to the earth clamp and place the items to be welded on it.
Standard practice in welding shops - at least it used to be
You'd be surprised how quickly the sales people at B&Q try and assist you after ignoring you for the past 15 minutes when you try and start a
chainsaw
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l0rd
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| posted on 28/7/10 at 04:09 PM |
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quote:
Originally posted by v8kid
I use a 12mm plate as a welding table connected to the earth clamp and place the items to be welded on it.
Standard practice in welding shops - at least it used to be
Still is i think. Up to the point, that you get morrons welding the chassis with the jig table.
(Heard it happened a few times in the past in Morgan cars)
[Edited on 28/7/10 by l0rd]
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interestedparty
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| posted on 28/7/10 at 04:46 PM |
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althought the thickness doesn't really matter, i use a piecee of 3mm works fine and I can lift it onto table and put it away when I dont need
it.
As some day it may happen that a victim must be found,
I've got a little list-- I've got a little list
Of society offenders who might well be underground,
And who never would be missed-- who never would be missed!
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MakeEverything
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| posted on 28/7/10 at 05:53 PM |
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quote:
Originally posted by l0rd
quote:
Originally posted by v8kid
I use a 12mm plate as a welding table connected to the earth clamp and place the items to be welded on it.
Standard practice in welding shops - at least it used to be
Still is i think. Up to the point, that you get morrons welding the chassis with the jig table.
(Heard it happened a few times in the past in Morgan cars)
[Edited on 28/7/10 by l0rd]
I do the same on my workmate. I clamp a piece of 6mm plate then use that as my welding platform.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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Mark Allanson
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| posted on 28/7/10 at 06:48 PM |
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Slightly off topic, but a good tip. Most hobby MIGs have very inadequate earth claps - get a cheap set of mole grips and weld an M8 bolt to it, and
fasten the earth cable to this. VERY stable, excellent connection and wont keep falling off.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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02GF74
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| posted on 29/7/10 at 08:14 AM |
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^^^ ooh, you are so cunning, but itsn't that a chicken and egg situation?
If you don't have a good clamp, how do you clamp to your clamp for a good connection? 
but about the gap, somtimes you have a piece that is not quite flag/square so there are gaps, enough to casue problem.
waving the torch between the two pieces and starting with the earthed piece sorts that but this is usually in cramped situations where it is hard to
reach and hard to see - hence the 2 clamp (TM) propostition.
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