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10 Cards in this Set
- Front
- Back
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You are silver brazing a metal. How does the melting point of the silver alloy filler metal compare to the melting point of the base metal? A. The melting point of the filler metal is above 800 °F B. The melting point of the filler metal and base metal is the same C. The melting point of the filler metal is below 800 °F D. None of the above |
The melting point of the filler metal is above 800 °F |
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What process in silver brazing describes capillary attraction? A. Alloy is filled in the joint B. Metal is melted in the joint C. Metal is welded in the joint D. Metal is distributed in the joint |
Metal is distributed in the joint |
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What grade of silver brazing filler metal is used for brazing copper and copper-base alloys? A. I B. II C. III D. IV |
III |
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After brazing, what temperature must you allow the work to cool below before cleaning the joint with warm water? A. 195 °F B. 200 °F C. 220 °F D. 425 °F |
B. 200 °F |
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The maximum permissible diametrical clearances used in silver brazing range from 0.001 to 0.012 inch. What factor(s) determine(s) the diametrical clearance? A. Pipe size B. Classification of the brazed piping system C. Tube size D. All of the above |
D. All of the above |
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Which of the following describes how heat travels through metal? A. Two pieces of contacting metal need to be heated separately B. Air is the main conductor or heat C. The process of heat flowing from molecule to molecule through metal is called convection D. Heat always flows from a hotter area to a colder area |
D. Heat always flows from a hotter area to a colder area |
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What is a process in which a layer of some special ferrous or nonferrous alloy is welded to the surface of new or old parts? A. Surfacing B. Soldering C. Brazing D. Sweating |
A. Surfacing |
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What must happen to new copper bits before they are used? A. Tinned B. Welded C. Soldered D. Heated |
A. Tinned |
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If a sal ammoniac is unavailable when tinning copper, what should you use? A. Bit solution B. Powdered sal ammoniac C. Rosin D. Solder coating |
C. Rosin |
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What are the most commonly used fluxes? A. Muriatic acid and zinc chloride B. Sal ammoniac (ammonium chloride) and zinc chloride C. Soldering salts and rosin D. Glycerin and rosin |
B. Sal ammoniac (ammonium chloride) and zinc chloride |
