Technical 34 pickup sheet metal delaminating?

this truck followed me home yesterday. the cab had been dipped to bare metal and i noticed some strange bubbles in one area on the left front. i started poking around and found that the metal seemed to blister out on both sides,so i drilled a hole in one of the blisters and found it was actually two layers of half the regular thickness. has anyone seen this before?


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Odd. I don't know but am interested to find out if anyone else knows anything about this.
It wasn't covered in lead was it?

 

I’d guess you have an inner layer in there and it’s not really delaminating.
The moisture may have been trapped between those two and caused the problem. Just speculating.

 

i really don't believe the "dipped to bare metal", looks like there is still paint and as 56don mentioned lead.

 

The difference in color in that area makes me think still has lead filler on it

 

Looks like lead.

 

Looks like the guy that spread the Lead didn't neutralize the acid after tinning. ?

 

the area is definitely not leaded in that area. you can see what dipping did to the lead in the second picture. as i ripped the out side of the bubble off the pieces are magnetic.


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it is definitely down to bare metal. all the paint is gone. there is some seam sealer and there are a few areas where some filler was real thick and it did not remove all of it.


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Possibly bad metal from the factory. It's a wonder it has lasted all these years.

 

that’s what i’m thinking cause it is only on one section, there are bubbles right up to one side of the seam on the cowl and perfect on the other side.


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I found that on my 33 after the dip. I had some bubbles in the rear panel. Almost looked like it was a laminate bubble, or like it was plated.
When I ground it off, it took a while for the edge to feather out.
I have no idea why it happened, just that it did.

 

Maybe in the past that panel was replaced by someone using some odd metal? It is indeed strange.

 

I don't know if there were two layers of metal in the structure there but if there was we all know what happens when water and debris gets between the two pieces. Here is what happend to my Studebaker, there was the formed sheet metal for the front and there was an additional reinforcement piece spot welded underneath so the horn mounting would be more rigid, I had to cut the metal and reinforcement piece out and totally replace....all that said, somehow it doesn't look like that is the same issue you have. In my case it was just cut out and replace both the skin and the reinforcement.

 

The Greenhouse effect ^

 

That is factory installed rust. They were working on perfecting it for years. It took Ford until 1957-1960 to get it perfected.

 

I'd seen that once, on a car Mickey Sanders was working on. It was an English car, (Rolls-Royce, once owned by the previous Queen of England!)
Mickey hated to cut a large patch, but was forced to.

 

I'm guessing that there was some contamination in the steel that was trapped as it was rolled into sheet metal. I have seen this in non-automotive situations. At a machine shop I worked at we had something similar but different. Some aluminum bar stock that had separations inside it, that we only found while machining it.

"the previous Queen of England"
Which one's that?

 

Okay, I'll answer my own question. The previous Queen of England was Victoria - so that's one old Rolls, considering she died in 1901.

 

Also not possible, as the first Rolls-Royce (the 10hp) was not released until December 1904.