gas welding, what are the drawbacks |
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gas welding, what are the drawbacks |
smdubovsky |
May 18 2006, 07:05 PM
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#21
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Member Group: Members Posts: 331 Joined: 27-September 04 From: Silver Spring, MD Member No.: 2,837 Region Association: MidAtlantic Region |
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 |
bondo |
May 18 2006, 07:54 PM
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#22
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
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) |
John Kelly |
May 19 2006, 06:07 AM
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#23
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Senior Member Group: Members Posts: 692 Joined: 1-May 03 From: Moclips WA. Member No.: 640 |
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 |
jimkelly |
May 19 2006, 06:39 AM
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#24
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
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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