Manufacturing And Production Technology
In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.

GMAW practice
Globular transfer
Spray transfer
Dip transfer

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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.

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

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Manufacturing And Production Technology
The grooving is an operation of

Beveling the extreme end of a workpiece
Reducing the diameter of a workpiece over a very narrow surface
Enlarging the end of a hole cylindrically
Embossing a diamond shaped pattern on the surface of a workpiece

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Manufacturing And Production Technology
Shrinkage allowance on pattern is provided to compensate for shrinkage when

The metal changes from liquid to solid state at freezing temperature
The temperature of metal drops from pouring to room temperature
The temperature of solid phase drops from freezing to room temperature
The temperature of liquid metal drops from pouring to freezing temperature

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