Manufacturing And Production Technology
The primary purpose of a sprue in a casting mould is to

Feed molten metal from the pouring basin to the gate
Help feed the casting until all solidification takes place
Feed the casting at a rate consistent with the rate of solidification
Act as a reservoir for molten metal

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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.

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

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Manufacturing And Production Technology
In ultrasonic machining, the metal is removed by

Using abrasive slurry between the tool and work
Erosion caused by rapidly recurring spark discharges between the tool and work
Direct contact of tool with the work
Maintaining an electrolyte between the work and tool in a very small gap between the two

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