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26 Cards in this Set
- Front
- Back
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Which heat treatment alters the grain structure of the weld deposit and heat-affected zone? |
Normailizing |
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Temperature refers to the: |
Intensity of heat |
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The movement of heat within the body of a material is called: |
Conduction |
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The transfer of heat from one body to another is called: |
Convection |
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The movement of heat in air is called: |
Radiation |
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The rate of thermal conductivity refers to the |
Speed at which heat travels within a material |
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The material that requires the lowest heat input for welding because of its poor thermal conductivity is: |
Mild steel |
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The material that requires the greatest heat input for welding because of its high thermal conductivity is: |
Aluminum |
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Restrained expansion of metal when it is heated results in? |
Dimensional upset |
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Unrestrained expansion and contraction of a metal when it is heated and allowed to cool slowly produces: |
No appreciable change |
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The dimensional upset that occurs when expansion is restrained may be used to good advantage to: |
Remove broken studs |
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What is the result of welding a section when both expansion and contraction are restrained? |
Very high stress |
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Preheating heavy sections can help: |
Prevent weld bead cracking |
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Metals that are to be welded and that are low in ductility are usually preheated in order to: |
Slow the quench rate |
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What is the soaking time required to stress relieve a steel weldment that is one inch thick? |
1 Hour |
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The annealing of a steel fabricator should |
Decrease tensile strength |
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What effect does pre-heating have on a steel weldment? |
It decreases tensile strength and increases ductility |
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The heat-treating process that brings a material to its softest, toughest, weakest state is: |
Annealing |
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Heating steel above its upper critical temperature and cooling in still air describes a heat treatment known is: |
Normalizing |
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The temperature range for stress relieving is: |
1100F - 1300F |
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Tempering is a ________process |
Toughening |
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To produce grain structure uniformly throughout the weldment and critical areas, you would: |
Normalize |
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Heating above the upper critical temperature followed by a rapid quench describes: |
Hardening
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Heating below the lower critical temperature followed by a rapid quench describes: |
Tempering |
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A temperature-indicating crayon marked at 300F is used for: |
Preheating |
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What is a temperature sensing device? |
Pyrometer |
