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Category > Applied Sciences Posted 05 May 2017 My Price 7.00

The unit melting energy


The unit melting energy for a certain sheet metal to be spot welded is 9.5 Emm3. The thickness of each of the two sheets to be welded is 3.5 mm. To achieve required strength, it is desired to form a weld nugget that is 5.5 mm in diameter and 5.0 mm thick. The weld duration will be set at 0.3 sec. If it is assumed that the electrical resistance between the surfaces is 140 micro-ohms, and that only one-third of the electrical energy gem crated will be used to form the weld nugget (the rest being dissipated into the work), determine the mini-mum current level required in this operation.

 

 

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IT KING
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Status NEW Posted 05 May 2017 12:05 PM My Price 7.00

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