Problem NO: 14

Suppose in the previous problem that a roll spot-welding operation is performed instead of seam\nwelding. The interface resistance increases to 100 mic

Suppose in the previous problem that a roll spot-welding operation is performed instead of seam

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welding. The interface resistance increases to 100 micro-ohms, and the center-to-center separation

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between weld nuggets is 25 mm. Given the conditions from the previous problem, with the changes

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noted here, determine (a) the proportion of energy generated that goes into the formation of each

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weld nugget, and (b) the rotational speed of the electrode wheels. (c) At this higher rotational speed,

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how much does the wheel move during the current on-time, and might this have the effect of

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elongating the weld nugget (making it elliptical rather than round)?

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