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<p>[QUOTE=&quot;rlm&#039;s cents, post: 2091913, member: 7957&quot;]That is pure guess as to the why tin, but it makes sense.&nbsp; I found the 1%</p><p><a href="http://www.ngccoin.com/coin-varieties/half-cents-and-cents/lincoln-cents-vscid-21/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.ngccoin.com/coin-varieties/half-cents-and-cents/lincoln-cents-vscid-21/" rel="nofollow">http://www.ngccoin.com/coin-varieties/half-cents-and-cents/lincoln-cents-vscid-21/</a></p><p><br /></p><p>Welding has the same root as refining, but not the same reasoning.&nbsp; Refining is difficult because the O2 bond is so strong.&nbsp; The initial problem with welding was because aluminum is so reactive with O2 and they cannot be in contact during welding.&nbsp; There are other problems with welding (aluminum has an extremely high heat transfer coefficient), but oxygen was the first problem.[/QUOTE]</p><p><br /></p>

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