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.

3000 welds/min, 75 mm/min
600 welds/min, 1500 mm/min
22 welds/min, 55 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 centre distance of bull gear and crank pin
Increasing the centre distance of bull gear and crank pin
Increasing the length of the arm
Decreasing the length of the slot in the slotted lever

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