Welding on Pig body's (2 Viewers)

[Megadoomer]

I think in the second video he shows the lap weld back where the joint is facing upward ( or downward?)so water would be hard to get to? I might be wrong about this as I was my third beer.

oh ok, I didnt watch the second one. He was really dry and I was falling asleep.

 

[J Mack]

Questions about doing this.

• would you use a cavity wax or fluid film method on an ABCD pillar?
• 100% yes, I’ve mentioned this several times in several places but I will share my thoughts again here. A pig is known to condensate and rust from the inside out, if we assume this moisture is collected up at the roof and migrates down then the edge of the inner roof skin and all the pillars would see moisture and would be a great place to apply a protective coating. The nice thing about the cavity way is its ability to wick (capillary action) into areas paint cannot and stay semi flexible indefinitely. "inside doors and tailgate is also a great place to apply some extra coating" the area were the door skin folds over the door structure is prone to rusting and the wax will wick into that area.
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• Would you want some sort of paint on the inside of a pillar first?
• Paint is a plus and adding another layer of protection is a great idea if the right product is used and applied correctly. Unfortunately that’s easier said than done and too much of the wrong paint would bridge over gaps and prevent the cavity wax form getting in and crack out later letting water in. Painting blind in a cavity is easier watching on YouTube than doing it on your pig so If I were going to paint first I would go sparingly with the paint and heavy with the wax, as I said above dripping out the bottom wouldn’t hurt my feelings.

2.A What is the method for doing that if so?

I have the guns I showed above but you could use a cavity wax gun/ pressurized undercoating gun with the flexible tube extension from Amazon/China and fill it with your favorite paint and coat the insides with paint first, as cheap as those guns and tubes are I wouldn’t even bother cleaning them between coats.



Hypothetically, if you cut the roof off of a vehicle below the drip rail and then had access to the pillars from the top. What would you do to prep them before putting a roof back on?

Same as above but I believe you could get in all the cavities better, the pillars are several pieces welded together and have several cavities that might be very difficult to get to from just the access points. Remember the pig also has large access holes below every pillar and you would want to snake the tube up from there as well as down from above.

 

[J Mack]

I think in the second video he shows the lap weld back where the joint is facing upward ( or downward?)so water would be hard to get to? I might be wrong about this as I was my third beer.

Yeah he talks about this in the second video.
I was originally taught to lap weld and lead the seam on the outside and undercoat the inside, that quickly changed to body filler "Bondo" on the outside and I feel like that's what I did forever.
I started watching the "HERO" guys that 100% metal finish the panels butt weld and started doing that more but for all the reasons the guy in the video mentioned I'm starting to lean back to lap welding.

That old Mac Tools flange tool also pokes holes and it was quick to do a patch with just spot welds and I don't remember seeing the little paint blisters everyone is getting in their patched panels now