Rolling

Sliding

Dragging

Use a trolly

Cooling the metal

Heating the metal slowly

Hold at a given temperature

Heat and cool the metal as soon as possible

To increase softness

To with stand wear resistance

To withstand heavy load

To decrease the brittleness

Oxygen valve in cylinder

Oxygen valve at blow pipe

Acetylene valve in cylinder

Acetylene valve at blow pipe

Gas cutting

Plasma cutting

Manual cutting

Machine cutting