Workshop Technology
For gas welding, the pressure desired at the welding torch for acetylene is

70 to 280 kN/m²
280 to 560 kN/m²
560 to 840 kN/m²
7 to 103 kN/m²

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Workshop Technology
Spot welding is used for welding

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

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Workshop Technology
Lancing is the operation of

Cutting a sheet of metal through part of its length and then bending the cut portion
Bending a sheet of metal along a curved axis
Cutting a sheet of metal in a straight line along the length
Removal of metal to the desired shape from the edge of a plate

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Workshop Technology
During hot working of metals

All of the listed here
Mechanical properties are improved due to refinement of grains
Grain structure of the metal is refined
Porosity of the metal is largely eliminated

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