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What is torque-turn tightening?
What is a stud (in the context of threaded fasteners)?
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What is the technical difference between a screw and a bolt?
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What are some of the reasons why assemblies must be sometimes disassembled?
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How does mechanical assembly differ from the other methods of assembly discussed in previous
\r\nchapters (e.g., welding, brazing, etc.)?
There are 20 correct answers in the following multiple choice questions (some questions have multiple
\r\nanswers that are correct). To attain a perfect score on the quiz, all correct answers must be given. Each
\r\ncorrect answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1 point, and
\r\neach additional answer beyond the correct number of answers reduces the score by 1 point. Percentage
\r\non the quiz is based on the total number of correct answers.
\r\n31.1 In brazing, the base metals melt at temperatures above 840°F (450°C) while in soldering they melt
\r\nat 840°F (450°C) or below: (a) true or (b) false?
\r\n31.2 The strength of a brazed joint is typically (a) equal to, (b) stronger than, or (c) weaker than the filler
\r\nmetal out of which it is made?
\r\n31.3 Scarfing in the brazing of a butt joint involves the wrapping of a sheath around the two parts to be
\r\njoined to contain the molten filler metal during the heating process: (a) true or (b) false?
\r\n31.4 Best clearances between surfaces in brazing are which one of the following: (a) 0.0025-0.025 mm
\r\n(0.0001-0.001 in.), (b) 0.025-0.250 mm (0.001-0.010 in.), (c) 0.250-2.50 mm (0.010-0.100 in.), or
\r\n(d) 2.5-5.0 mm (0.10-0.20 in.)?
\r\n31.5 Which of the following is an advantage of brazing (three best answers): (a) annealing of the base
\r\nparts is a by-product of the process, (b) dissimilar metals can be joined, (c) less heat and energy
\r\nrequired than fusion welding, (d) metallurgical improvements in the base metals, (e) multiple joints
\r\ncan be brazed simultaneously, (f) parts can be readily disassembled, and (g) stronger joint than
\r\nwelding?
\r\n31.6 Which of the following soldering methods are not used for brazing (two correct answers): (a) dip
\r\nsoldering, (b) infrared soldering, (c) soldering iron, (d) torch soldering, and (e) wave soldering?
\r\n31.7 Which one of the following is not a function of a flux in brazing or soldering: (a) chemically etch
\r\nthe surfaces to increase roughness for better adhesion of the filler metal, (b) promote wetting of the
\r\nsurfaces, (c) protect the faying surfaces during the process, or (d) remove or inhibit formation of
\r\noxide films?
\r\n31.8 Which of the following metals are used in solder alloys (four correct answers): (a) aluminum, (b)
\r\nantimony, (c) gold, (d) iron, (e) lead, (f) nickel, (g) silver, (h) tin, and (i) titanium?
\r\n31.9 A soldering gun is capable of injecting molten solder metal into the joint area: (a) true, or (b) false?
\r\n31.10 In adhesive bonding, which one of the following is the term used for the parts that are joined: (a)
\r\nadherend, (b) adherent, (c) adhesive, (d) adhibit, or (e) ad infinitum?
\r\n31.11 Weldbonding is an adhesive joining method in which heat is used to melt the adhesive: (a) true or
\r\n(b) false?
\r\n31.12 Adhesively bonded joints are strongest under which type of stresses (two best answers): (a)
\r\ncleavage, (b) peeling, (c) shear, and (d) tension?
\r\n31.13 Roughening of the faying surfaces tends to (a) have no effect on, (b) increase, or (c) reduce the
\r\nstrength of an adhesively bonded joint because it increases the effective area of the joint and
\r\npromotes mechanical interlocking?
What are some of the limitations of adhesive bonding?
\r\n
Identify some of the advantages of adhesive bonding compared to alternative joining methods.
\r\n
What are some of the methods used to apply adhesives in industrial production operations?
\r\n
What is an important precondition for the success of an adhesive bonding operation?
\r\n
Name the three basic categories of commercial adhesives.
\r\n
What are some of the methods used to cure adhesives?
\r\n
An adhesive must cure in order to bond. What is meant by the term curing?
\r\n
What is meant by the term structural adhesive?
What are the disadvantages and drawbacks of soldering?
\r\n
List the advantages often attributed to soldering as an industrial joining process?
\r\n
What is wave soldering?
\r\n
What are the functions served by the bit of a soldering iron in hand soldering?
\r\n
What are the two most common alloying metals used in solders?
\r\n
What are some of the disadvantages and limitations of brazing?
\r\n
Define braze welding.
What is dip brazing?
What are the desirable characteristics of a brazing flux?
\r\n
The molten filler metal in brazing is distributed throughout the joint by capillary action. What is
\r\ncapillary action?
Certain changes in joint configuration are usually made to improve the strength of brazed joints.
\r\nWhat are some of these changes?
\r\n
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