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Unread 11-02-2013, 05:26 PM   #1
Dumpsterfish
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Question about MIG settings/technique

Hola JF,

So I had some time today and some 1/4" hot roll plate scraps to play with, so I set up the miller 211 on 230v with 75/25 and .035 solid.

After several passes at various settings and using various techniques (stringer, weave overhand circles/weave underhand, whip, etc), this is the best I could come up with:



image-2184626666.jpg



image-4146769224.jpg



image-1343844959.jpg

I'm satisfied with the bead itself, but as you can see, this didn't fully penetrate. I used a 45d bevel on each edge of the butt joint to make a 1/8" deep v groove, and had the welder set to voltage 7 and wire 55.

My question is this: do welder manufacturers assume a fully beveled joint when printing recommended settings? Do they assume you'll be manipulating/weaving at all? I really concentrated on maintaining a stick out of 3/8 and a 5d drag angle, but never quite burned all the way through.

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Unread 11-04-2013, 10:05 PM   #2
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The recommended settings are just to get you in the ball park of the right settings. Every person sets their machine up differently. As for your penetration did you leave a gap between the 2 plates? Did you have a landing on the bevels?
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Unread 11-04-2013, 10:24 PM   #3
nixer600
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I usually leave it on auto set, and set the metal thickness a little thicker than what it is, and I'm usually happy with the weld.

Your beads look nice.


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Unread 11-05-2013, 06:53 AM   #4
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Either move the wire closer to the front of the puddle and down into the root(key hole) or
do a root pass and then a hot pass.

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Unread 11-05-2013, 10:36 AM   #5
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Thanks for the tips. I did not leave a gap at all, and the bevels only went about halfway down (1/8). I think I'll try to gap it about 1/16 and see if that helps.

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Unread 11-05-2013, 11:41 AM   #6
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Make the gap about an 1/8" and bevel it all the way until you have about an 1/8" landing (flat spot) left. Then run a root pass then a cap or a fill and cap how ever many it takes to make it flush or close to flush with the plates
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Unread 11-05-2013, 11:49 AM   #7
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1/8. Got it. So when miller says in the brochure that this machine is capable of 3/8 in a single pass...are they lying? Or do they assume like an .045 wire and 100% co2 setup on a different kind of weld? Didn't read the fine print...

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Unread 11-05-2013, 05:53 PM   #8
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Quote:
Originally Posted by Dumpsterfish View Post
and a 5d drag angle
are you dragging? I don't know if it makes a whole lot of penetration difference, but I usually push if I'm using gas.
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Unread 11-06-2013, 10:35 AM   #9
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Quote:
Originally Posted by danielbuck
are you dragging? I don't know if it makes a whole lot of penetration difference, but I usually push if I'm using gas.
I've tried both, and I honestly didn't see much difference in penetration. The bead profile changed, but pushing didn't get any farther down.

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Unread 11-06-2013, 10:37 AM   #10
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People will argue back and forth weather you get better penetration or not by pushing.. When I was going to school for welding I was taught if there's slag you drag if there's not you push.
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Unread 11-06-2013, 11:30 AM   #11
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Quote:
Originally Posted by Dumpsterfish View Post
I've tried both, and I honestly didn't see much difference in penetration. The bead profile changed, but pushing didn't get any farther down.
That has kinda been my experience too. Don't really notice much difference, but since it's always been suggested to me to push while using gas, I try and do that for what it's worth.
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Unread 11-06-2013, 12:38 PM   #12
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Won't have a day off until Friday, but I'll try setting up a few different tests to see which will work out better for me.

Should probably be working on 3/16" anyway, since that seems to be the most common thickness for bumpers, sliders etc.

But then, there's my personal motto: if it's worth building, it's worth overbuilding.

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Unread 11-07-2013, 08:22 AM   #13
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<--------- Drags for penetration.. pushes for less penetration (sheet metal..etc).
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Unread 11-07-2013, 09:43 AM   #14
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Quote:
Originally Posted by BESRK
<--------- Drags for penetration.. pushes for less penetration (sheet metal..etc).
That's what I've read...seems to make sense.

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Unread 11-09-2013, 04:16 AM   #15
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There's really not much more penetration.. Jody on weldingtipsandtricks did a nice little demonstration of that, along with vertical techniques and showing the abysmal penetration down handing gets.
I use push for all MIG. Pushing gives a flatter bead profile, pulling builds up more. If I need buildup, I'll pull. Sometimes pulling is a little more accepting of gaps in the fit up.
If it's got slag, drag.
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