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Heat distribution in spot welding
Besides the resistance at the interface, there are six other resistance through which the same welding current is passed. They are:
Therefore, some amount of heat is generated in these regions also (equal to I2 x R x t).The effective heat that is utilised is that due to the resistance at the metal - metal interface only, the others being losses.Among the above six resistance, R2 and R5 are high compared to the other four. These two can be minimised by properly choosing the electrode pressure and cleaning the surface well.
Determine the maximum pressure applied inside the shell: A thin spherical shell of 1.5 m diameter is built by joining steel plates of 8 mm thickness by riveting. The efficienc
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Q. What is Squeeze time? It is the time between the initial application of the electrode pressure on the work and the initial application of current to make the weld. During th
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