@ifthevamzarockin said: "In 1962, DuPont applied for a patent on the explosion welding process, which was granted on June 23, 1964 under US Patent 3,137,937[2] and resulted in the use of the Detaclad trademark to describe the process."
"Explosion welding can join a wide array of compatible and non-compatible metals; with more than 260 metal combinations possible."
Here's the full patent which was filed on October 26, 1960.
The video from DuPoint here indicates their approach were selected for production US Mint clad coins. Was the Inco approach used for production US Mint coinage?
Nobelclad said:
The explosion cladding technology (EXW) was patented by DuPont in 1960. The DuPont DetaClad® team built the world’s first industrial explosion cladding facility in the mid-1960’s at Pompton Lakes, NJ, USA. The cladding operations for this facility were performed in an underground blast chamber two hundred meters from the clad production factory. The chamber was isolated by heavy steel doors to provide noise and air pollution management. After evaluation of cladding atmosphere options, including vacuum, DuPont chose to work with the natural air atmosphere in their underground chamber. The DuPont cladding production technology was fully developed at this site, culminating in the creation of the DetaClad Technical Cladding Manual. In the late 1960s, DuPont proceeded to license their DetaClad EXW technology globally to licensors in several European countries as well as India and Japan.
Comments
The middle layer is mildly attracted to a magnet.
Here's a great video on Detaclad from DuPont showing the ingot and explosion bonding process for coins.
https://digital.hagley.org/FILM_1995300_FC395_01
Nice clip, right to the point. I'm gonna watch for a sample on my flea market jaunts.
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Here's the full patent which was filed on October 26, 1960.
https://patents.google.com/patent/US3137937A/en
So a timeline is:
Very much so and very cool.
DuPont bricks were the first step in the eventual shifting of our silver coinage to clad in the mid 1960’s.
This collection was the next step.
https://forums.collectors.com/home/leaving?allowTrusted=1&target=https://coins.ha.com/itm/patterns/1964-1965-international-nickel-company-25-cent-test-pieces/a/1216-6783.s
The video from DuPoint here indicates their approach were selected for production US Mint clad coins. Was the Inco approach used for production US Mint coinage?
https://digital.hagley.org/FILM_1995300_FC395_01
Here's some additional interesting info on the history of DuPont Detaclad.