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<p>[QUOTE=&quot;Conder101, post: 1611910, member: 66&quot;]The process starts with three ingots of the different alloys.&nbsp; Two of the 80% silver/20% copper and one of the 79% copper 21% silver.(For simplicity I&#039;m just going to call these silver and copper)&nbsp; One side of each of the silver ingots would be planed off and polished smooth and both the upper and lower faces of the copper ingot are similarly polished.&nbsp; The reason for this is the flat smooth surface allow for better contact and and make the bonding process work better.</p><p><br /></p><p>The three ingots would be stacked silver/copper/silver with the polished surfaces together.&nbsp; Now today they would simply be put through a set of high pressure rollers and as the ingots are rolled out into strip the high pressure would bond the three layers together.&nbsp; back in the 60&#039;s they actually used a process called explosive bonding which was exactly what it sounds like.&nbsp; A shapped explosive charge would be placed around the ingots and detonated.&nbsp; The charge would be configured so the the force of the blast would be applied the the entire surface of the ingot stack evenly and the force would bond the three layers together.&nbsp; The ingot stack would then be put through the rollers in a normal fashion and rolled out into the strip.&nbsp; Then the blanks would be punched from it and you get the wonderful &quot;sandwich&quot; we are familiar with today.</p><p><br /></p><p>The same process was used with the coppernickel and copper ingots used to make the coppernickel clad strip.[/QUOTE]</p><p><br /></p>

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