Tool Talk
Wrench Forum => Wrench Forum => Topic started by: stanley62 on August 10, 2013, 01:51:26 PM
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Found this P & O and it has a piece coming off one side like a delamination. Any ideas to the cause? Why would the wrench have a plate laminated on it? Sooo many questions.
Jim
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Stamped wrench, likely from cold rolled steel plate.
Cold rolled used to do strange things like that, inclusions (impurities) in the steel
would be flattened out into large areas during rolling....
Stamping out the wrench resulted in 2 layers of metal almost but not quite stuck together, given time and a touch of rust.....
(Stamping probably hardened the surface somewhat also, helping it along...)
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Same thing happens to coins too.
(http://i1082.photobucket.com/albums/j368/wvabe/My%20Laminations/bth_003-3.jpg)
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It is part of the process of making long sticks of flat stock or angle iron They make a longer continous stick of a bunch of shorter pieces while still heated red hot. Roll two ends together in the hot stages enough its much like old fashioned hammer welding. The results are not always perfect but it keeps the steel mill making product faster than a start-stop method.
A local steel seller has an entire rack of pieces de-laminated like that he has accumulated over 30 odd years. I buy it sometimes at reduced prices to get the shorter sticks out of them.