Manufacturing And Production Technology
When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as

Ultrasonic machining
Electrochemical machining
None of these
Electro-discharge machining

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Manufacturing And Production Technology
Calculate the weld per minute, 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.

600 welds/min, 1500 mm/min
22 welds/min, 55 mm/min
500 welds/min, 1250 mm/min
3000 welds/min, 75 mm/min

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