![The heat transfer efficiency in arc welding of a plate using a current of 250 A at 20 V is 90%](https://www.gkseries.com/blog/wp-content/uploads/2023/09/The-heat-transfer-efficiency-in-arc-welding-of-a-plate-using-a-current-of-250-A-at-20-V-is-90.jpg)
Q. The heat transfer efficiency in arc welding of a plate using a current of 250 A at 20 V is 90%. The heat required to melt the material is 10 J/mm3. If the cross-sectional area of the weld joint is 30 mm2 and the travel speed is 5 mm/s, the melting efficiency (in %) is_____(round off to 2 decimal places)
Ans: 30.00-34.00
Sol:
![](https://www.gkseries.com/blog/wp-content/uploads/2023/09/Screenshot-852.png)