GATE ME 2015 Set 1 — Question 41
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Manufacturing Processes → Joining → Welding Processes
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Question
A DC welding power source has a linear voltage-current (-) characteristic with open circuit voltage of and a short circuit current of . For maximum arc power, the current (in Amperes) should be set as ________
Correct answer
149 to 151
Solution
For a linear - characteristic, the relationship between voltage () and current () is given by:Given:
Open circuit voltage,
Short circuit current, Substituting the values:The arc power () is the product of voltage and current:To find the current for maximum arc power, we differentiate with respect to and set it to zero:Thus, for maximum arc power, the current should be set to .
Open circuit voltage,
Short circuit current, Substituting the values:The arc power () is the product of voltage and current:To find the current for maximum arc power, we differentiate with respect to and set it to zero:Thus, for maximum arc power, the current should be set to .
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