railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Joining Welding
In case of arc welding of steel with a potential of 20 V and current of 200 A, the travel speed is 5 mm/s and the cross-sectional area of the joint is 20 mm2. The heat required for melting steel may be taken as 10 J/mm3 and heat transfer efficiency as 0.85. The melting efficiency will be nearly.
1
18 %
2
29 %
3
36 %
4
42 %