Exam 27: Welding Metallurgy

A material can have a large quantity of heat energy in it, but the material can be at a low temperature.

____ is the ease with which a metal will crack or break apart without noticeable deformation.

To obtain a fine-grained structure, the metal must be heated quickly above the critical temperature and cooled quickly in a process called ____________________.

Alloy systems that show a partial solubility in the solid phase generally have very high solubility at room temperature.

The final individual crystal size within the metal depends on the length of time that the material is at the crystal-forming temperature and any obstructions to its growth.

Temperature is the quantity of thermal energy, and heat is the level of thermal activity.

____________________ is the process of reheating a part that has been hardened through heating and quenching.

We can tell the temperature of an object by the frequency of the light its vibrating atoms produce.

Both crystalline and amorphic materials look and feel like solids, so without sophisticated testing equipment, you cannot tell the difference between them.

____ is the ability of a metal to be permanently twisted, drawn out, bent, or changed in shape without cracking or breaking.

____ involves heating the structure of a metal to a high enough temperature to turn it completely austenitic.

____ strength is the property of a material to withstand a twisting force.

All metals have the ability to have their properties altered by some form of heat treatment.

Ductility is the ability of a material to return to its original form after removal of the load.

____________________ materials have no orderly arrangement of their atoms into crystals.

____ consists of heating steels to slightly above a specific temperature and holding for austenite to form, then followed by cooling (in still air).

Cold cracks are caused by tearing the metal along partially fused grain boundaries of welds that have not completely solidified.

A(n) ____________________ is the lowest possible melting temperature of an alloy.

____ is the principal cause of porosity in aluminum welds and with GMAW welds on stainless steels.

Sensible heat is absorbed by a material as it changes from a solid to a liquid state and from a liquid to a gaseous state.