Hi anchorgal86,
It depends on what kind of metal you're referring to.
http://www.feminenza.org/articles/copper.htm
For example, for iron to be hardened, it has to be heated. We have all
seen either the images or reality of the blacksmith working in the
heat of the forge. Copper, on the other hand, is weakened by heat. To
be hardened, the metal must be cool. So bronze is hardened by
hammering it when the metal is cold.
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Heat-straightening Repair of Damaged Steel Bridges
http://www4.trb.org/trb/nchrp/unselected.nsf/0/ceb0b969b65eab2985256a31006eef04?OpenDocument
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The Repair and Thermal Upgrading of Historic Steel Windows
http://www.oldhouseweb.com/oldhouse/content/npsbriefs/metalwindows/5.asp
Sections that are seriously bent or bowed must be straightened with
heat and applied pressure in a workshop.
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http://www.yarnellhoffer.com/page/scaffoldingmultipurposebiljax.html
Paint surfaces which are cracked and/or show areas where the paint has
"crazed"; such signs may indicate prior damage and subsequent
straightening. Such damage may also have overstressed the metal and
weakened it.
REMEDIES AND REPAIRS
A. Bent or distorted members may be cold straightened only - NEVER USE
HEAT TO STRAIGHTEN SCAFFOLDING COMPONENTS. After straightening,
inspect the metal for developed cracks; if it still shows kinks or
depressions, it has been weakened at that point and should not be used
until repaired, if repairs are possible.
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Fundamentals of Metal Fatigue:
http://www.engr.ku.edu/~rhale/ae510/fatigue.pdf
Best regards,
tlspiegel |
