Workshop Technology
The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is

Less than 0.1 percent
Anywhere between 0.1 to 1 percent
More than 0.3 percent
Less than 0.3 percent

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Workshop Technology
Spot welding is used for welding

Butt joints in plates having thickness above 3 mm
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
Lap joints in plates having thickness above 3 mm

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