Workshop Technology
The instrument which has all the features of try-square, bevel protractor, rule and scriber, is

Depth gauge micrometer
Outside micrometer
Combination set
Inside micrometer

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Workshop Technology
Spot welding is used for welding

Butt joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having 0.025 mm to 1.25 mm thickness
Butt joints in plates having thickness above 3 mm
Lap joints in plates having thickness above 3 mm

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