02GF74
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| posted on 23/3/09 at 01:36 PM |
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MIG welder capacity
when MIG welder specs can weld up to x mm mild steel, doesthat ment total tickness of both pieces? (surely it has to).
is there quick rule of thumb to say x Amp welder can weld up to y mm of mild steel?
where x = 120 Amp is of particular interest
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tegwin
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| posted on 23/3/09 at 01:41 PM |
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The "thickness" figure has always seemed a little spurious to me...
If you are clever how you notch or V the joint you can weld much thicker than they claim....
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www.verticalhorizonsmedia.tv
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UncleFista
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| posted on 23/3/09 at 02:26 PM |
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Have a look HERE there's a table showing what power you need for what thickness.
Cracking website with mucho info for welding amateurs (like me !) 
Tony Bond / UncleFista
Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night the ice-weasels come...
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BenB
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| posted on 23/3/09 at 05:56 PM |
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Also check (same website) their info on the welding ability of the Clarke 90.
The quoted capabilities of Mig welders are often hopelessly optimistic.
I've got a Clarke 90 and it'll do 1.5-2mm max... I think Clarke say it'll do 3mm. No way. Not even with notching and 100% CO2....
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zilspeed
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| posted on 23/3/09 at 06:01 PM |
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quote:
Originally posted by BenB
Also check (same website) their info on the welding ability of the Clarke 90.
The quoted capabilities of Mig welders are often hopelessly optimistic.
I've got a Clarke 90 and it'll do 1.5-2mm max... I think Clarke say it'll do 3mm. No way. Not even with notching and 100% CO2....
When I made the engine crane trolley, I used 3mm equal angle.
That needed the 160 amp welder on spinal tap settings.
(Turned up to 11, because it's one louder than 10.)
CO2 as well.
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David Jenkins
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| posted on 23/3/09 at 06:12 PM |
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When I welded some 5mm plate I had to get my stick welder out - my 150A MIG just couldn't get it hot enough to make a proper weld pool (just got
cold, brittle welds).
Fortunately I like stick welding...
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dinosaurjuice
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| posted on 23/3/09 at 06:53 PM |
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if you need to weld something thick make sure youve got a really good earth clamp and lead. the higher the resistance, the lower the welding current.
everything youll ever need to know about mig welding is on mig-welding.co.uk!
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BenB
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| posted on 23/3/09 at 08:14 PM |
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It's def true that a good earth is important. I put a new earth clamp on my mig recently and it was a revolation!!!
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Peteff
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| posted on 23/3/09 at 08:58 PM |
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My Erfi 170 will weld 6mm no problem and will probably go thicker but I never needed to. When I was at the foundry we used to flatten copper pipe
round the end of the earth cable then drop a metal weight on it to earth to castings or use mole grips to clamp to plate.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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