Heat Treatment Flashcards
The extent of the change of the green structure in the heat effective zone depends upon
A)The temperature to watch the middle is subjected
B)The composition of the steel
C)The rate of cooling
D) All of the above
D) All of the above
Which of the listed heat treatments alters the green structure of the world deposit and he affected zone A)Stress relief B)Tempering C)Normalizing D) Preheating
C)Normalizing
Temperature refers to the: A)Intensity of heat B)Amount of heat C)Volume of heat D) Quality of heat
A)Intensity of heat
The movement of heat within the body of material is called: A)Radiation B)Conduction C)Convection D) Transference
B)Conduction
The transfer of heat from one body to another is called: A)Radiation B)Conduction C)Convection D) transference
C)Convection
The movement of heat air is called: A)Radiation B)Conduction C)Convection D) transference
A)Radiation
The rate of thermal conductivity refers to the:
A)Melting temperature of the metal
B) BTU output of an oxyfuel welding tip
C)Speed at which heat travels with an a material
D)Time required to melt through the metal
C)Speed at which heat travels with an a material
The material that requires the lowest he input for welding because of its poor thermal conductivity is: A)Mild steel B)Brass C)Aluminum D) Copper
A)Mild steel
The material that requires the greatest he input from welding because of its high thermal conductivity is A)Aluminum B)Mild steel C)Stainless steel D) Cast iron
A)Aluminum
Restrained expansion of metal when it is heated results in A)Internal cracking B)Dimensional upset C)Internal stress D) Surface hardening
B)Dimensional upset
Unrestrained expansion and contraction of a metal when it is heated and allowed to cool slowly produces A)Internal cracking B)Dimensional upset C)No appreciable change D) Surface hardening
C)No appreciable change
The dimensional upset that occurs when expansion is restrained maybe used to get advantage to A)Remove broken studs B)Use jigs and fixtures C)Remove excess weld reinforcement D) weld around the neutral access
A)Remove broken studs
What is the result of welding a section when both expansion and contraction or restrained A)Excessive warping B)Loss of dimensions C)Very high stress D) A good sound weld
C)Very high stress
On which of the following jobs were expansion and contraction work in your favour
A)When welding a joint subject to a high degree of restraint
B)When repairing an exhaust manifold
C)When repairing the smoke on a fly wheel
D) When welding aluminum tire rims
C)When repairing the smoke on a fly wheel
Preheating heavy sections can help A)Prevent weld bead cracking B)Increase internal stress C)Increase tensile strength D) Produce a fine grain structure
A)Prevent weld bead cracking
Metals that are to be welded and that are low in ductility are usually preheated in order to A)Promote fine grain size B)Slow the quench rate C)Improve the harden ability D) Increase the welding stresses
B)Slow the quench rate
Which of the following cannot be accomplished with a post wild heat treatment A)Annihilating B)Normalizing C)Stress relieving D) Distortion control
D) Distortion control
What is the soaking time required to stress relieve a steel weldment that is 1 inch thick A) One hour B)Two hours C)Three hours D) Four hours
A) One hour
The annealing of a steel fabrication should A)Decrease distortion B)Increase hardness C)Decrease ductility D) Decrease tensile strength
D) Decrease tensile strength
What effect does preheating have on a steel weldment
A)It increases tensile strength and ductility
B)Decreases tensile strength and ductility
C)Increases tensile strength and decreases ductility
D) Decreases tensile strength and increases ductility
D) Decreases tensile strength and increases ductility
The heat treating process that brings the material to it softest toughest Weakest state is A) annealing B)Normalizing C)Stress relieving D) Tempering
A) annealing
Heating still above it up or critical temperature in cooling and still air describes a heat treatment known as A)annealing B)Normalizing C)Stress relieving D) Tempering
B)Normalizing
The temperature range for stress relieving is: A)870°C to 980°C / 1600°F to 1800°F B)760°C to 870°C/ 1400°F to 1600°F C)595°C to 700°C / 1100°F to 1300°F D) 425°C to 5 35°C / 800°F to 1000°F
C)595°C to 700°C / 1100°F to 1300°F
Tempering is a… Process A)Case hardening B)Preheating C)Hardening D) toughening
D) toughening
To produce green structure uniformity through the weldment and critical areas you would A)Temper B)Stress relieve C)Normalize D) Preheat
C)Normalize
Heating above the upper critical temperature followed by a rapid quench describes A)Stress relieving B)Normalizing C)Tempering D) Hardening
D) Hardening
Heating below the lower critical temperature followed by a rapid quench describes A)Stress relieving B)Normalizing C)Tempering D) annealing
C)Tempering
Temperature indicating crayon marker at 150°C or 300°F is used for A)Hardening B)Preheating C)Stress relieving D) Annealing
B)Preheating
Which of the following is a temperature sensing device A)Thermograph B)Inclinometer C)Barometer D) pyrometer
D) pyrometer
