Fundamental of Welding Science and Technology NPTEL ANSWERS : WEEK 6 (Question 7-8)

 Fundamental of Welding Science and Technology NPTEL ANSWERS : WEEK 6 (Question 7-8)

7. Increase in welding current tends to cause:

 More distortion

 Less distortion

 More reinforcement

 Both (a) and (c)

D

8. In a DC arc welding operation, the voltage-arc length characteristic was obtained as Varc = 20 + 5*l, where the arc length l was varied between 5 mm and 7 mm. Here Varc denotes the arc voltage in Volts. The arc current was varied from 400 A to 500 A. Assuming linear power source characteristic, the open circuit voltage and the short circuit current for the welding operation are:

 45 V, 450 A

 75 V, 750 A

 95 V, 950 A

 150 V, 1500 A

C

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