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Two pipes of inner diameter 100 mm and outer diameter 110 mm each are joined by flash butt welding using 30 V power supply. At the interface, 1 mm of material melts from each pipe which has a resistance of 42.4 ohms. If the unit melt energy is 64.4 MJ/m3, then time required for welding (in s) is
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Correct Option: C
Energy Required for melting/volume
E = 64.4 MJ/m³
V = 30 volts
R = 42.4Ω
di = 100 mm
do = 110 mm
| Melting Energy = | d²0 - d²i) × 644.4 × 106j | |
| 4 |
= 212.32 Joules
| H = I²RT = | T | |
| R |
V = IR
| T = | × R = | ||
| V² | 30² |
T = 10 Sec
