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Old 07-31-2007, 10:01 AM
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Default School me on my welds...

So yesterday, I spent about 2+ hours just burning scrap, playing with the voltage and wire speed, and the gas pressure... it was UBBER FUN!

I loved that I can acutally see the weld puddle, b/c with the flux core the smoke and sparks made it really hard to see it clearly.

I tried welding some sheet metal for fun, I tried running beads on some thicker stuff and welding some tube together (thin 16ga.). The thicker stuff was easier to control, I burned through the thinner stuff, but then practiced closing up the hole with the mig too.

I have a few questions and I will get a few pics up soon:

What should the gas pressure be set at for straight C02? If I backed it off too far it would spatter pretty good. However, is there any reason to run it any higher than what it takes to shield the weld from spatter? I had it around 20ish on my dial that ranges from 0-30.

Also, do I need to make small circles as I move the puddle down the joint? Or with a MIG can you just move the wire in a straight line. My welding handbook says pull a straight line, but I was taught (arc welding) to move in tiny circles.

It was hard to move in circles on the sheet metal. The thicker stuff actually started to look good. I beat on things with a Big Hammer and nothing broke at over 90 degrees, so that is a plus.

I feel like the welds are sitting on top of the metal a bit high, and I can't tell if that is because I am putting too much material in, moving to slow, or it isn't penetrating enough...

I will go snap a few pics.

Thanks!
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Old 07-31-2007, 10:17 AM
mhdsummers mhdsummers is offline
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http://www.millerwelds.com/education...tips/MIG_tips/
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Old 07-31-2007, 10:19 AM
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Try not too

pics:
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Old 07-31-2007, 10:22 AM
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Looks like metal slugs
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My camping trailer build up thread.

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Old 07-31-2007, 10:34 AM
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in most, your travel speed is too high, your wire speed too high, and stick out too far.
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Old 07-31-2007, 10:40 AM
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Quote:
Originally Posted by green machine View Post
in most, your travel speed is too high, your wire speed too high, and stick out too far.
Hate it when you stick is out to far!
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Old 07-31-2007, 10:48 AM
mhdsummers mhdsummers is offline
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I agree turn down the wire speed and get closer to your work.
To avoid the welds in Pic #2, travel at a steady pace. A couple of those welds look really good though (pic #3). In that weld it looks like you made little cirlces. This probably helped you to slow down and to travel at a steady pace allowing the weld to penetrate.

My welder will allow you to change the wire speed while you are welding. You might want to try it just to see how it affects the bead.
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Old 07-31-2007, 01:14 PM
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also, make sure your angle is not too "flat" or to close to the material. Meaning, you want to have the gun tip at aroun 50-70 degrees.

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Old 07-31-2007, 02:02 PM
bustanutley bustanutley is offline
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Crank up the heat, slow down the wire speed and the speed you are moving and make C's. I run mix so I don't know about 100% CO2. I'm a pusher, not a puller unless i'm doing sheet metal.
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Old 07-31-2007, 02:23 PM
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Thanks! I will try to slow down a bit. The one that looks good #3 was pretty easy since I was trying to move the puddle up and down on the vertical facea and the horizontal face.

Another question. Should the cup be sticking out further than the wire tip, if I tighten mine up they line up exactly... just wondering.

I will slow down and decrease the wire speed.

Thanks!
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My rig... "Maude"
1976 FJ40 with some stuff and some leaks.

2001 Sequoia Limited with heated seats

My camping trailer build up thread.

"You 80 guys are just a Sawzall away from nirvana." -Red Chili
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