Chapter 7: Weldability, Welding Metallurgy, And Welding Chemistry Flashcards
As a metal is heated:
Energy is added to the structure, the atoms move farther apart, the atoms vibrate more vigorously and the metal expands
The state of matter which exhibits the least amount of energy is:
Solid
A problem occurring in weldments caused by the nonuniform heating produced by the welding operation is:
Distortion
What will not result in the elimination or reduction of residual stresses
External Restraint
Rapid cooling of a steel from the austenitic range results in a hard, brittle structure shown as:
Martensite
Very slow cooling of steel may result in the production of a soft, ductile microstructure that has a lamellar appearance when viewed under high magnification. This structure is referred to as:
Pearlite
When rapid cooling produces a martensite structure, what nonaustenitizing heat treatment may be applied to improve the ductility of the steel?
Tempering
The use of preheat will tend to:
Result in a wider heat-affected zone, produce a lower heat-affected zone hardness, slow down the cooling rate and reduce the tendency of producing martensite in the heat-affected zone
Which of the following changes will warrant the addition of or increase the required preheat?
Increased base metal thickness and increased carbon equivalent
What heat treatment is characterized by holding the part at the austenitizing temperature for some time and then slow cooling in the furnace?
Annealing
What heat treatment is characterized by holding the part at the austenitizing temperature for some time and then slow cooling in still air?
Normalizing
Increasing heat input
Just remember question 12 that it was none above
Increasing preheat
Decreased the cooling rate, decreased the likelihood of cracking problems
Increasing the carbon content
Increases the likelihood of cracking problems (I think it makes it harder)
Which of the following generally follows quenching?
Tempering
