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Practicing mig weld body panels

Brno8x57

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Maryland
I would like to practice at welding body panels for a future car restoration. I have a mig welder but need material to practice on. Any recommendations?
Car Junkyard for some body panels?
Old barrels?
Buy some new steel?
Any suggestions?

Thanks
 
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ghnl

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Ask a body shop if they have any panels for the taking. They often replace rather than repair damaged panels.
 

56Safari

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Yank a fender from pull a part? can't be that expensive.. I'm sure they'd work out a deal for you on a beat up one
 

Kaizen

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I did the same thing for my basket case. Got a welder and some flat sheet metal at hd and practiced a little. Then cut off old parts and practiced a little. Then just went to town. It’s just spot welds so not real technical. Once you get the heat and speed dialed in you just take your time. Quarter panel patches take a hell of a lot of spot welds/plug welds.


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gofastwclass

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KC Area
The answer to your question depends on what year vehicle you're planning on working on. Older vehicles use thicker material than newer vehicles. Not sure you're aware but some newer vehicles use high strength steel panels which essentially aren't repairable using traditional means. Other newer vehicles use aluminum panels and others are composite.

Even with classic cars when replacement panels are available the metal is often thinner than original equipment. Welding automotive panels with a MIG tales a LOT of practice, patience and proper technique to prevent warping.

Robert (MP&C) has a thread about various automotive projects he is building or has built. Follow him. He has an immense amount of valuable information related to automotive repair and fabrication in his thread.

Robert's thread is here: MP&C Shop Projects

Happy hunting.
 

Jazz1

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You could practice with late model panel as that will be quite thin
I practiced mig welding the floor pans so by the time I got to rocker panels I was the worlds Okayest welder. Mig is pretty simple if you have a decent machine
What kind of car are you restoring?
 

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lilredex

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Look for discarded washers, dryers, dishwashers, etc. Lots of free stuff out there on garbage day, and you can be selective. Or go to a scrapyard, they always have suitable practice material.
 

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driz

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Uhhhh. I have done a fair number of my own using that stuff. Be careful. Those old washing machine panels are fine but they DONT weld like the OEM stuff at all. .023 solid wire is best if you have gas. I just made [emoji3061]1/4 of the side panels of my old GMC using Maytag and Kenmore panels and managed with .030 flux core and my little HH135 machine. .023/and gas sure is easier though[emoji847] so use that if you can.
FYI Mill Supply does make many of the repair panels for about any car. Prices good just watch the shipping before finalizing as oversized shipping can $$$$.

If you are planning on doing the same type to same type steel like a new fender or patch panel it’s way better to practice and dial it in on some scrap fender. Call a junk yard and ask how much for some scrap like an old smashed front fender trunk lid or hood. If it’s no good it shouldn’t be but a few bucks. Heck you may have an old scrap piece yourself about practice on that and dial it on that.
Something else very handy is a heat sink to stick behind panels to **** up heat and prevent burn through. It’s just a piece of flattened scrap copper water pipe a foot long. Bend to suit, it helps. Lasts forever .
Get a couple cheap HF 4” wide flange vise grips. They’re **** but great for bending small straight shapes and clamp positioning. Same goes for their slightly larger ones with the deep reach and little flex contact points on the tips. Great deep reach positioners, light duty clamps. Just don’t ask too much of em or[emoji2959]. HF also has those little tiny positioning clips that fit in between panels. Get some they work great and are that second pair of hands you ain’t got, dirt cheap and work well.
Just remember panels don’t really get welded[emoji1781]they get a couple hundred conjoined tacks. Bevel the edges of the front of both panels slightly at 45 degrees for better joining before positioning, it helps. Work all over spaced far apart so there’s time to cool before you hit that area again. A couple here a couple there in half second bursts till your trigger finger aches[emoji847]. Take your time,drink beer enjoy......Don’t try to do like the pros. and use no filler at all, aint gonna happen unless you do it every day.
Make sure when you’re setting up to start welding that things line up and don’t move. Try to avoid any high spots, low is better as you can easily fill and blend to the higher edges than try to hide an[emoji214]egg in the center of a long flat[emoji85]
Do your first piece down low if possible. You can’t see mistakes down there where as the hood would look like [emoji90]. Try to practice on the not so visible areas then do stuff higher up, more visible!
Oh and be sure when the welding done and before buttoning things up address the back side of that weld. As best you can prime and paint then even undercoat it if you can. Rest assured, when it rusts again it WILL start along that weld so do what you can to make it last.......







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Brno8x57

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Maryland
Lots of good advice and tips. I’m going to look for a couple of autobody places. The one near me wasn’t open to it, MoCo Maryland has so many lawyers people are afraid of even selling car body panels. I’m also heading to metal superstore to look for scraps. I’ve tried scrapyards before and they don’t seem to want to sell, they only buy. Junkyard is on my list too.
Cars to be restored: one has very thick panels, the other has very thin.
 

rsanter

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visalia ca
Ask a body shop if they have any panels for the taking. They often replace rather than repair damaged panels.

This.
Most busy shops will give you a panel or two.
Also you can look for guys parting out cars. If you asked for a bent panels from one of my junk cars I would tell you that you have to remove it
 
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Jackfre

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I had never done body panel welding. I had only done heavier material. Color me surprised when it disappeared before my very eyes. Life is a humbling experience. One thing that did help me once I got the machine and my head wrapped around the project was, I took a 4" piece of 1" copper pipe and pounded it flat. When I could reach it I put that pipe against the back of the weld. It took some of the heat out of it and helped me out quite a lot. Good luck with the project.
 

Kaizen

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Is the copper heat sink meant to be used during the welding or after?



Copper flat stock is normally used behind a plug weld so the wire does not blow through. You should be taking your time so the panel does not heat up which is why cold winter is great for this work.


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Brno8x57

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You could practice with late model panel as that will be quite thin
I practiced mig welding the floor pans so by the time I got to rocker panels I was the worlds Okayest welder. Mig is pretty simple if you have a decent machine
What kind of car are you restoring?
A 73 Porsche 914 and a 63 jaguar. The jag is More rust
Than car in some areas. Looks to be 18 and 20 gauge for the panels. Any general tips before I start? Doing the jag first.
 

Kaizen

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A 73 Porsche 914 and a 63 jaguar. The jag is More rust
Than car in some areas. Looks to be 18 and 20 gauge for the panels. Any general tips before I start? Doing the jag first.



What ye welder giveth, ye grinder taketh away.
Spot weld. Keep cool or the panel will warp. Have fun. I used a body saw to cut through both panels at once. Take out old pieces without removing new panel and the gap is perfect for 025 spot welds. I used roloc discs to do the final grinding on the joints.


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Mr_fixit

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Rustylvania
Practice on newer thin metal. Welding thicker stuff is much easier. If you can get good on thin stuff, you'll be great on thicker...
 
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Brno8x57

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So I got a square foot of 18 gauge, 1/8, and 1/4 inch mild steel. Plate and some angle to practice with.
I’m going to try and start with 1/4 to 1/4 inch angle to get a feel for everything. If you’re in the silver spring area tonight, the glow and sparks you see are me welding everything i can get a hold of.
 

Kaizen

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So I got a square foot of 18 gauge, 1/8, and 1/4 inch mild steel. Plate and some angle to practice with.
I’m going to try and start with 1/4 to 1/4 inch angle to get a feel for everything. If you’re in the silver spring area tonight, the glow and sparks you see are me welding everything i can get a hold of.



What welder are you using? Gas? Hope it’s 220v with that 1/4 inch.


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Kaizen

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Nope that will be fine. It will allow you to get a good puddle going and practice. Night and day to car panels though. Car panels you should just be using spot welds and at a low voltage. If you had a 110 machine it won’t make a dent in that without using flux core


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