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Question
Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles ‘on’ and 2 cycles ‘off’ Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.
Options:
A .  2.17 rpm, 600 joules
B .  6.8 rpm, 6 joules
C .  5.03 rpm, 600 joules
D .  22 rpm, 600 joules
Answer: Option A

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