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Post by Chris72 on Jan 20, 2009 21:34:25 GMT 1
1. Whats the difference
2. which would be better suited for welding panels to my bug?
I've noticed that Arc welders seem to be fairly cheaper than mig, any reason why?
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Post by axenige on Jan 20, 2009 21:53:03 GMT 1
Both MIG and Arc welder work on the same principle  With Arc welding the fluxed filler rod, is the conductive electrode (+), with a separate earth (-) clamp attached to the work. When you strike the rod against the steel it completes the circuit, the resulting electrical arc, melts the rod and fuse it with the surrounding steel. A MIG welder works in the same way, however instead of a conductive (+) filler rod, a MIG uses a roll of welding wire which is feed by the welder as you work, the tip of the welding torch has a Gas shroud around it, which delivers CO2 while you weld, this acts as a flux and thus excludes impurities from the weld, and therefore gives a much stronger joint . A MIG is much easier to use then an Arc welder, MIGs best for thin and medium thickness, Arc for welding together thick stuff so pay the extra and go for a MIG, plus some models are now gas-less, as the CO2 has been replaced by a flux/gas coating on the wire, with activates when you strike the arc. |
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Post by steve66! on Jan 20, 2009 22:28:37 GMT 1
yeah mig is easier to control and more suited to car repair work.
I have a little mini-mig which is great- you can borrow it if you ask nicely!
Steve (toughjeans) has a monster one- no doubt if u ask him nicely he'll let you have play...
depends on your budget what to go for but i wouldn't use gasless, oh, a normal mig will let you use gasless wire (flux-cored) anyway.
Hope this helps!
Steve
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Post by steve66! on Jan 20, 2009 22:33:03 GMT 1
Both MIG and Arc welder work on the same principle With Arc welding the fluxed filler rod, is the conductive electrode (+), with a separate earth (-) clamp attached to the work. When you strike the rod against the steel it completes the circuit, the resulting electrical arc, melts the rod and fuse it with the surrounding steel. A MIG welder works in the same way, however instead of a conductive (+) filler rod, a MIG uses a roll of welding wire which is feed by the welder as you work, the tip of the welding torch has a Gas shroud around it, which delivers CO2 while you weld, this acts as a flux and thus [glow=red,2,300]excludes impurities from the weld,[/glow] and therefore gives a much stronger joint . A MIG is much easier to use then an Arc welder, MIGs best for thin and medium thickness, Arc for welding together thick stuff so pay the extra and go for a MIG, plus some models are now gas-less, as the CO2 has been replaced by a flux/gas coating on the wire, with activates when you strike the arc. actually the CO2- or agon or CO2/argon mix, excludes air thus stopping the plasma oxidizing or burning. but yeah, without it the weld is very weak. if its there at all! s |
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Post by Chris72 on Jan 21, 2009 0:21:25 GMT 1
Cheers guys. couldn't have explained it better. Thanks for the offer steve, Once weathers bit better may take you up on offer ;D
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Post by axenige on Jan 21, 2009 1:08:36 GMT 1
No Steve you do get oxide impurities in the weld without a flux/gas of some type or other, this would appear as a loose black oxide power which is not fused, the same applies with gas welding  the best way to tell is to grind the surface of the weld back, if the weld is pure there will be no sign of where the filler rod/ wire has been added to the joint, if however a hair line , or surface pitting, or loose oxide are present in the joint you've not got a true weld, I.E. the metal weld is not homogeneous. P.S. Argon is just the fancy name for industrial oxygen |
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Post by steve66! on Jan 21, 2009 8:30:34 GMT 1
ARGON isnt!
Argon is one of the noble gases along with Krypton, Xenon, Neon.
THey are very unreactive and form a protective shroud!
HAHA
steve
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Post by fast65 on Jan 21, 2009 18:33:54 GMT 1
argon is argon if you try an breathe that you will pass out  there is no o2 in there andy |
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Post by axenige on Jan 21, 2009 19:00:04 GMT 1
sorry my error |
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Post by hayleyc1 on Jan 21, 2009 22:15:11 GMT 1
we now know who did chemistry at school!lol
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Post by steve66! on Jan 21, 2009 23:14:05 GMT 1
^ i got an Alevel in it.
not an a grade mind you
;D
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Post by axenige on Jan 22, 2009 0:37:51 GMT 1
we now know who did chemistry at school!lol I didn't know that ;D In which case  ChemicalSteve should be his next forum name, if he changes it yet again |
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Post by steve66! on Jan 22, 2009 8:22:11 GMT 1
^^^^
what like chemical ali?
of saddam fame?
HAHA
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there is no o2 in there