Question

In a DC arc welding operation, the voltage-arc length characteristic was obtained as \(V_{\text{arc}} = 20 + 5L\), where the arc length L was varied between 5 mm and 7mm. Here \(V_{\text{arc}}\) denotes the arc voltage in volts. The arc current was varied from 400 A to 500 A. Assuming linear power source characteristics, the open circuit voltage and short circuit current for the welding operation are:

• A. 45 V, 450 A
• B. 75 V, 550 A
• C. 95 V, 950 A
• D. 150 V, 1500 A

Hint:

Always associate the minimum arc length (lower voltage) with the maximum current, and the maximum arc length (higher voltage) with the minimum current.
This inverse pairing is a fundamental characteristic of welding arcs.

Answer 1

The Correct Option is C