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  1. Replies
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    clearly, you're not one of those "experts." i-car...

    clearly, you're not one of those "experts." i-car and other fabricators and experienced autobody technicians would disagree with you. plug welds are one of the major structural components of a...
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    Feels nice to see some progress after truck in...

    Feels nice to see some progress after truck in the garage since September. Slowly biting away. Now I just need to finish fabricating the top plate and set into place.
    ...
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    top to bottom 105A, 22.9+0V 115A, 24.9+0V...

    top to bottom

    105A, 22.9+0V
    115A, 24.9+0V
    110A, 23.9+0V
    120A, 25.9+0V

    https://www.dropbox.com/s/q0gszpxb2ll781m/2022-06-07_191112.jpg?raw=1
    ...
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    top to bottom bottom two rows welded with...

    top to bottom

    bottom two rows welded with copper bar on the bottom

    changed gas from ~17 to ~13 CFH

    92A, 20.5+0V, bottom row
    100A, 22.1+0V, top three rows
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    I am no chemical engineer but I find it...

    I am no chemical engineer but I find it interesting that the weld pools up, pops, and burns through when there is no zinc on the top-facing coupon and yet it was okay when the zinc was left untouched...
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    I have that punch tool, well at least the one I...

    I have that punch tool, well at least the one I have punches 1/8 holes, way too small for my application. The backer is nice and have the same one but I have yet to order a bronze/copper rod.
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    suggestions on epoxy primer?

    suggestions on epoxy primer?
  8. Replies
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    This sample coupon was painted with rustoleum...

    This sample coupon was painted with rustoleum zinc on a single side of each coupon.

    The top row at 83A, 18.7(22.7)+10V and penetration on the back side, BUT... I forgot to lay the zinc painted...
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    I've used ospho, or phosphoric acid on my bare...

    I've used ospho, or phosphoric acid on my bare sheetmetal. Spray it on and wipe it off with soap and water to neutralize it. When you're ready to work with it sand it off.
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    You are right. I was thinking Argon, but C25 is...

    You are right. I was thinking Argon, but C25 is mix.
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    A lot of heat in the plate. I tend to do the...

    A lot of heat in the plate. I tend to do the first two outside first then wait a minute or two to do the middle. I keep the nozzle on the weld until the weld goes dark. Also blow some air on it after...
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    I'll have to try C25 sometime, but for now, it's...

    I'll have to try C25 sometime, but for now, it's 100 co2. The high settings could be the length of the extension cable 20' that I'm using and causing a vdrop.

    I don't know how accurate my...
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    (Continued from preivous post) DA ...

    (Continued from preivous post)

    DA


    https://www.dropbox.com/s/l0nkix3cyuucrlb/009_PXL_20220602_001421381.MP.jpg?raw=1
    ...
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    This sample coupon is painted with rust-stop on...

    This sample coupon is painted with rust-stop on front and back and dried over night. Removed material with flat 5/16 bit with both plates aligned. I left rust-stop on both between the layers but...
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    This sample coupon is painted with rust-stop on...

    This sample coupon is painted with rust-stop on front and back dried over night. Removed material with flat 5/16 bit with both plates aligned. Rust-stop was left on both sides of the top plate and...
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    not opinions. they are statements from REAL...

    not opinions. they are statements from REAL autobody techs and fabricators. I have no idea what you are going on about. My statements have been very clear.
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    100% C02. MIG is C02. MAG is 75/25. I'm not using...

    100% C02. MIG is C02. MAG is 75/25. I'm not using 75/25 and have no desire to. The only difference is spattering and that is coming from experienced old-school autobody techs. I don't get much...
  18. As long as it is not structural, additionally...

    As long as it is not structural, additionally panel bond is extremely flammable, welds are not.

    Read up on John Eagle Collision Center
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    continue from last post ...

    continue from last post

    https://www.dropbox.com/s/p8brtag82o273c2/PXL_20220531_201813378.jpg?raw=1

    https://www.dropbox.com/s/1lt7dpdt9pjtxcw/PXL_20220531_201827792.MP.jpg?raw=1
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    Started from outside, instead of inside, and the...

    Started from outside, instead of inside, and the puddle somewhat falls into the middle though I need to fill it. I guess it's not hot enough? What do you think about the top two center welds?

    ...
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    I am using MIG/CO2, 0.023 solid wire which is...

    I am using MIG/CO2, 0.023 solid wire which is recommended. not stick.

    18ga on 18ga in these sample coupons


    Amperages are from bottom to top in photos below, welding from right to left.


    ...
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    Plug/Rosette welds

    Plug welds 5/16

    18 gauge

    0.23/CO2 26-30psi

    e formation and sweeping left to right.

    I think I'm moving too fast, but also deal with hand/arm tremors. Last time I welded was 30 years ago. I...
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