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Old 07-05-2010, 12:13 PM   #26
eg33GC
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Member#: 206851
Join Date: Mar 2009
Chapter/Region: MWSOC
Vehicle:
99 V4
EJ20K RS

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Originally Posted by madmax718 View Post
# 100% CO2 -Lowest price, generally greatest penetration, and higher levels of spatter. Limited to short circuit and globular transfer.
# 75% Argon - 25% CO2 -Higher price, most commonly used by home hobbyist and light fabricator, lower levels of spatter and flatter weld bead than 100% CO2. Limited to short circuit and globular transfer.
# 85% Argon - 15% CO2-Higher price, most commonly used by fabricators, with a good combination of lower spatter levels and excellent penetration for heavier plate applications and with steels that have more mill scale. Can be used in short circuit, globular, pulse and spray transfer.
# 90% Argon - 10% CO2- Higher price, most commonly used by fabricators, with a good combination of lower spatter levels and good penetration for a wide variety of steel plate applications. Can be used in short circuit, globular, pulse and spray transfer.
This is all for MIG.
For Tig, you don't want to use c02 generally.
90/10 works great, but 100% Ar is the way to go.
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Old 07-15-2010, 11:42 AM   #27
wisconsinsubaru
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At our (Large) Fab shop we always use 75/25 for MIG

100% Argon for TIG
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Old 08-15-2010, 03:19 PM   #28
Burnman
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Join Date: Jul 2009
Chapter/Region: VIC
Location: Burnaby
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95 Legacy
That ugly 'spruce' green.

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Originally Posted by Hoo View Post

As for sharpening the tungsten the only thing you really need to pay attention too is that the grind marks should be running parallel with length of the tungsten. This will help to focus the arc and help make the point last longer. Most people use bench grinders, I have a coarse and a fine wheel at the shop, use the coarse wheel to rough it out and finish it on the fine wheel. They also make dedicated sharpeners but you dont need one of those.
Our welding shop at work doesn't have a dedicated sharpening machine, but they do have a dedicated bench grinder with a different wheel that is only for tungstens. Reduces contamination.
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