Manufacturing And Production Technology
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.

22 rpm, 600 joules
5.03 rpm, 600 joules
6.8 rpm, 6 joules
2.17 rpm, 600 joules

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Manufacturing And Production Technology
When the temperature of a solid metal increases,

Both strength and ductility of the metal decreases
Strength of the metal decreases but ductility increases
Both strength and ductility of the metal increases
Strength of the metal increases but ductility decreases

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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
3000 welds/min, 75 mm/min
500 welds/min, 1250 mm/min

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Manufacturing And Production Technology
In a shaper, the length of stroke is increased by

Decreasing the length of the slot in the slotted lever
Decreasing the centre distance of bull gear and crank pin
Increasing the length of the arm
Increasing the centre distance of bull gear and crank pin

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