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Unread 05-30-2012, 09:38 PM   #1
CJinDNA
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MIG ? regarding varying material thicknesses

I am just getting started with MIG welding and have recently reached a point of understanding the mechanics. I have what is likely a very noob question regarding heat/speed setup when welding material which has mixed thicknesses.

As an example, if I were looking to weld axle perches to an axle tube in which the perch is 0.1875 and the axle tube is 0.25 would you set the MIG up for the thicker material and risk burning through the thinner material or is a heat range set up for the thinner material going to provide the necessary penetration for the thicker material?

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Unread 05-30-2012, 10:38 PM   #2
RenoF250
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I am no expert but I set it towards the thicker material and then spend more time on the thicker side to keep from burning through.
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Unread 05-31-2012, 11:00 AM   #3
ArticRubi
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X2. Set up for thicker and make your stroke a bit quicker over the thinner piece. I practiced by getting some scrap metal of different thicknesses and used different joint types between the two (lap, butt, T, ect)
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Unread 05-31-2012, 07:28 PM   #4
CJinDNA
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Certianly appreciate the advise and will be looking to pick up some scrap this weekend for some testing as suggested.
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Unread 06-01-2012, 02:43 PM   #5
lobukjeep
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What those guys said.Set it for the thick metal and work the hot puddle into the thin side.You will get the hang of it.
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Unread 06-01-2012, 07:59 PM   #6
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3/16" and 1/4" are close enough in thickness that you shouldn't have to worry about burning thru if you're set up for 1/4".

Based on your question (and the critical nature of a spring perch), I would definately recommend a good amount of practice before burning in something like perches.
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Unread 06-02-2012, 12:00 PM   #7
CJinDNA
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Thanks again for the feedback. I am certainly no where near ready to put my life at risk with my welding skills (or lack of), the perch was the first thing that came to mind as to when this issue would crop up. Spent a little too much time practicing, without sleeves, already today and you can imagine what my weld burn looks like at the inside of my elbow..... Just another lesson
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Unread 06-02-2012, 03:13 PM   #8
BESRK
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You can buy some "slip on" sleeves. I like the Blue Miller sleeves. The elastic stays "tight" a long time. I used to weld without sleeves a few years ago.. arms always looked like those of a junky
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Unread 06-02-2012, 03:40 PM   #9
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X whatever on washing from the thick stuff to the thin stuff.
I weld alot without sleeves, it's only for short times...most of the time. Get some spats if your gonna be welding in tennis shoes and short socks, them dang dingle berries will ruin a good pair of socks and burn something fierce too.
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Unread 06-02-2012, 09:41 PM   #10
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Miller has a weld calculator as does esab. Set your machine for the heavier material. Practice your welds on scrap material first.
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