GATE ME 2016 Set 2 — Question 60
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Manufacturing Processes → Joining → Welding Processes
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Question
The voltage-length characteristic of a direct current arc in an arc welding process is , where is the length of the arc in mm and is arc voltage in volts. During a welding operation, the arc length varies between and and the welding current is in the range . Assuming a linear power source, the short circuit current is_________ A.
Correct answer
423 to 428
Solution
The arc voltage characteristic is given by .
For , .
For , .A linear power source characteristic is defined as , where is the open circuit voltage and is the short circuit current.
In arc welding, a shorter arc length (lower voltage) typically corresponds to a higher current. Thus:
At , .
At , .Substituting these into the power source equation:
1)
2) Subtracting equation (1) from (2):
Substitute into equation (2):
Now, find the short circuit current :
.
For , .
For , .A linear power source characteristic is defined as , where is the open circuit voltage and is the short circuit current.
In arc welding, a shorter arc length (lower voltage) typically corresponds to a higher current. Thus:
At , .
At , .Substituting these into the power source equation:
1)
2) Subtracting equation (1) from (2):
Substitute into equation (2):
Now, find the short circuit current :
.
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