Chapter 25 Flashcards
Annealing
the process used to soften steel and remove internal strains.
* This is accomplished by heating the steel to a uniform glowing dark-red color and then allowing it to cool slowly out of contact with the air to prevent oxidation.
Bending and Shaping
- To bend, straighten, or shape metal with an oxyacetylene torch, attach a rosebud tip and adjust a neutral flame.
- Keeping the inner cone back away from the surface, heat the metal evenly by moving the flame around.
- When the
contraction
Metal does this when it is cooled.
expansion
Metal does this when it is heated.
flame hardening
a process whereby mild steel is heated to a cherry red glow and then quenched in water or oil to harden it.
* Use a rosebud tip and a neutral flame.
neutral flame
(equal amounts of oxygen and acetylene):
o Open the torch oxygen valve until the acetylene feather disappears and only the inner cone and outer envelope exist.
o When the feathery edges of the inner cone disappear, a neutral flame is present.
tempering
the process used to soften steel and remove internal strains.
* This is accomplished by heating the steel to a uniform glowing dark-red color and then allowing it to cool slowly out of contact with the air to prevent oxidation.
Annealing
- To bend, straighten, or shape metal with an oxyacetylene torch, attach a rosebud tip and adjust a neutral flame.
- Keeping the inner cone back away from the surface, heat the metal evenly by moving the flame around.
- When the
Bending and Shaping
Metal does this when it is cooled.
contraction
Metal does this when it is heated.
expansion
a process whereby mild steel is heated to a cherry red glow and then quenched in water or oil to harden it.
* Use a rosebud tip and a neutral flame.
flame hardening
(equal amounts of oxygen and acetylene):
o Open the torch oxygen valve until the acetylene feather disappears and only the inner cone and outer envelope exist.
o When the feathery edges of the inner cone disappear, a neutral flame is present.
neutral flame
tempering
