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WorksheetsJoining and assembly process-part 2
Total questions: 20
Worksheet time: 10mins
(a) use filler metals to permanently join metal parts, but there is no melting of base metals.
Brazing and soldering are used instead of fusion welding when
High strength is required
Metals have good weldability
Geometry of joint not suitable for
welding
SImilar metals are to be joined
The use of a flux is essential in brazing in order to prevent oxidation and to remove oxide films from workpiece surfaces.
True
False
What is the name for mechanical fastening methods shown above:
Clips
Crimping
Snap-in-fasteners
Metal stitching and stapling
Inorganic acids or salts, such as zinc- ammonium-chloride solutions usually used as fluxes in soldering
True
False
Adhesive bonding can best be described as the following EXCEPT:
It is among the very least cost method
Joining process in which a filler material is used to hold two (or more) closely-spaced parts together by surface attachment
Adhesive joints very strong joining as good as welded, brazed, or soldered joints
Used in a wide range of bonding and sealing applications for joining similar and dissimilar materials such as metals, plastics, ceramics, wood, paper, and cardboard
Which of the following is NOT the type of adhesive?
Natural adhesives
Synthetic adhesives
Composite adhesives
Inorganic adhesives
Adhesively bonded joints are strongest under which type of stresses
cracking
cleavage
peeling
shear
Which of these statement is NOT correct about the advantages of adhesive joining.
The appearance of components are generally improve
The need of great care of surface preparations
Thin and fragile components can be bonded without significant increase of their weight
Materials of very different properties can be joined
To use adhesive bonding, the joints must cannot be subjected to _______ force.
tensile
peeling
compression
shear
Describe mechanical fastening. What is it? Find the CORRECT answer.
A very skilled and specialized worker/person is needed to perform the fastening process.
It requires the components have to be melted before the fasteners are inserted.
Two or more components may have to be joined or fastened in such a way that they can be taken apart sometime during the product’s service life or life cycle.
Find the WRONG EXAMPLE of mechanical fastening method listed below
Clips: to join structural beams in buildings
Screws : joining pieces of wood, metals, plastics (furnitures, pencils, electronic parts)
Bolts & Nuts: almost all mechanical products (machine components)
Seaming : sheet metal joint (trash can, roof)
Limitation of adhesive bonding are listed below. Find the INCORRECT statement about its limitation
Adhesive must be compatible with materials being joined
Joints generally not as strong as other joining methods
Curing times can limit production rates
Service temperatures are NOT limited
Which best describe reason why mechanical assembly is often preferred compared others?
ease of disassemble
economies of scale
no heat affected zone in the base parts
specialization of labor
Advantages of snap fit assembly include which of the following
ease of disassembly
no heat affected zone
no special tools are required
stronger joint than with most other assembly methods
A fastener with internal threads.
Lock washer
Nut
Screw
Bolt
____ is threaded on both ends.
cap screw
machine bolt
machine screw
stud bolt
Find the WRONG STATEMENTS about rivet.
Most common method of permanent or semi-permanent mechanical joining is by riveting.
Rivets may be solid or tubular.
Riveting always be done at elevated temperatures only.
May be performed by hand or by mechanized means, including the use of programmable robots.
Identify the advantage of using adhesive bonding?
There are very limited application of materials to be joined
Cleanliness and surface preparation prior to application of adhesive are important
Bonding occurs over entire surface area of joint
Inspection of bonded joint is difficult
Below are the reasons why mechanical assembly is often preferred over other methods, EXCEPT:
Specialization of labor/worker is required.
Ease of assembly and disassembly including maintenance, parts replacement, or repair.
Ease in creating designs that require movable joints such as hinges, sliding mechanisms, and adjustable components and fixtures.
