Materials And Processes
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Why is it considered good practice to normalize a part after welding?
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To relieve internal stresses developed within the base metal.
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To increase the hardness of the weld.
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To remve the surface scale formed during welding.
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- 2.
The reheating of a heat treated metal, such as with a welding torch
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Has little or no effect on a metal's heat treated characteristics.
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Can significantly alter a metal's properties in the reheated area.
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Has a cumulative enhancement effect on the original heat treatment.
Correct Answer
A. Can significantly alter a metal's properties in the reheated area. -
- 3.
Which of the following descirbe the effects of annealing steel and aluminum alloys?
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Decrease in internal stress.
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Softening of the metal.
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1 and 2.
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Tempering.
Correct Answer
A. 1 and 2. -
- 4.
Which heat-treating process of metal produces a hard wear-resistant surface over a strong, tough core?
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Case hardening.
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Annealing.
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Tempering
Correct Answer
A. Case hardening. -
- 5.
In the four-digit aluminum index system number 2024, the first digit indicates
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The major alloying element.
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The number of different major alloying elements used in the metal.
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The percent of alloying metal added.
Correct Answer
A. The major alloying element. -
- 6.
The aluminum code number 1100 identifies what type of aluminum?
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Aluminum alloy containing 11 perfect copper.
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Aluminum alloy containing zinc.
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99 percent commercially pure aluminum.
Correct Answer
A. 99 percent commercially pure aluminum. -
- 7.
Which heat-treating operation would be performed when the surface of the metal is changed chemically by introducing a high carbide or nitride content?
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Tempering
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Normalizing
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Case hardening
Correct Answer
A. Case hardening -
- 8.
Parts are rinsed thoroughly in hot water after they have been heat treated in a sodium and potassium nitrite bath to
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Prevent corrosion.
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Prevent surface cracking.
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Retard discoloration.
Correct Answer
A. Prevent corrosion. -
- 9.
Why is steel tempered after being hardened?
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To increase its hardness and ductility.
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To increase its strength and decrease its internal stresses.
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To relieve its internal stresses and reduce its brittleness.
Correct Answer
A. To relieve its internal stresses and reduce its brittleness. -
- 10.
What aluminum alloy designations indicate that the metal has recieved no hardening or tempering treatment?
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3003-F
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5052-H36
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6061-O
Correct Answer
A. 3003-F -
- 11.
The SAE and the American Iron and Steel Institute use a numerical index system to identify the compostion of various steels. In the number "4130", designating Chromium Molybdenum steel, the first digit indicates the
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Percentage of the basic element in the alloy.
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Percentage of carbon in the alloy in hundredths of a percent.
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Basic alloying element
Correct Answer
A. Basic alloying element -
- 12.
Normalizing is a process of heat treating
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Aluminum alloys only
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Iron base metals only
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Both aluminum alloys and iron-base metals
Correct Answer
A. Iron base metals only -
- 13.
What is descriptive of the annealing process of steel during and after it has been annealed?
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Rapid cooling; high strength
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Slow cooling; low strength
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Slow cooling; increased resistance to wear.
Correct Answer
A. Slow cooling; low strength -
- 14.
Which material cannot be heat treated repeatedly without harmful effects?
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Unclad aluminum alloy in sheet form.
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6061-T9 stainless steel.
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Clad aluminum alloy.
Correct Answer
A. Clad aluminum alloy. -
- 15.
Alclad is a metal consisting of
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Aluminum alloy surface layers and a pure aluminum core.
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Pure aluminum surface layers on an aluminum alloy core.
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A homogeneous mixture of pure aluminum and aluminum alloy.
Correct Answer
A. Pure aluminum surface layers on an aluminum alloy core. -
- 16.
The core material of Alclad 2024-T4 is
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Heat-treated aluminum alloy, and the surface material is commercially pure aluminum.
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Commercially pure aluminum, and the surface material is heat-treated aluminum alloy.
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Strain-hardened aluminum alloy, and the surface material is commercially pure aluminum.
Correct Answer
A. Heat-treated aluminum alloy, and the surface material is commercially pure aluminum. -
- 17.
What is generally used in the construction of aircraft engine firewalls?
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Stainless Steel.
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Chrome-molybdenum alloy steel.
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Titanium Nickel alloy.
Correct Answer
A. Stainless Steel. -
- 18.
Which of the following occurs when a mechanical force is repeatedly applied to most metals at room temperature, such as rolling, hammering, or bending?
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The metals become artificially aged.
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The metals become stress corrosion cracked.
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The metals become cold worked, strain or work hardened.
Correct Answer(s)
A. The metals become artificially aged.
A. The metals become cold worked, strain or work hardened. -
Quiz Review Timeline (Updated): Jan 29, 2013 +
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Current Version
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Jan 29, 2013Quiz Edited by
ProProfs Editorial Team -
Oct 03, 2011Quiz Created by
Dr3wee
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