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> gas welding, what are the drawbacks
smdubovsky
post May 18 2006, 07:05 PM
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QUOTE(kwales @ May 18 2006, 04:22 PM) *

MIG uses an inert gas so the oxygen never hits the metal when it's melty hot.


Not that simple. MIG does NOT use an inert gas (unless your welding stainless). CO2 isn't inert and some of it it actually splits into C and O2 - adding carbon to the weld (and oxidizing some steel). Thats why pure CO2 give a hotter weld/more penetration than a C25 mix for the same machine settings.

SMD
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bondo
post May 18 2006, 07:54 PM
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QUOTE(smdubovsky @ May 18 2006, 06:05 PM) *

QUOTE(kwales @ May 18 2006, 04:22 PM) *

MIG uses an inert gas so the oxygen never hits the metal when it's melty hot.


Not that simple. MIG does NOT use an inert gas (unless your welding stainless). CO2 isn't inert and some of it it actually splits into C and O2 - adding carbon to the weld (and oxidizing some steel). Thats why pure CO2 give a hotter weld/more penetration than a C25 mix for the same machine settings.

SMD


Hmm, is that why mig welds are so darn hard? (extra carbon)
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John Kelly
post May 19 2006, 06:07 AM
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Here is an old article I wrote comparing the two weld types:

http://metalshapers.org/101/jkelly/index.html

In short, the henrob/dillon/cobra torch is great torch that will do a lot, but so will most small torches with a smaller price tag. I generally use my Victor Jr. I have never tried cutting with my henrob, so I can't speak to that. Check out the Meco midget from Kent White: www.tinmantech.com Small and light weight. The henrob is heavy.

Mig welding is not superior to gas welding, just easier. Welds shrink no matter the type. Shrinkage from gas welding is easy to stretch, mig welding shrinkage is not. The metal that is gas welded is softer and easier to work afterwards....no grinding is required just a little sanding or file work.

John www.ghiaspecialties.com
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jimkelly
post May 19 2006, 06:39 AM
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John,

Thanks for that info - lightweight and decent price !

http://www.tinmantech.com/html/meco_midget_torch.php

I am leaning mig - but like the idea of an old school open flame and filler rods : )
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