Joining Procedures

Which of the following statements is true about joining methods?

• A) All joining methods are permanent.

• B) Some joining methods allow joined parts to be separated.

• C) Joining methods are not important in machine construction.

• D) All joining methods are temporary.

Answer explanation

B is correct because some joining methods, like screws or bolts, allow for disassembly, while others, like welding, create permanent joints. This highlights the importance of choosing the right method based on the application.

What is the primary use of rivets in joining methods?

• To weld two metal pieces together

• To glue two surfaces

• To mechanically fasten two or more pieces together

• To solder electronic components

Answer explanation

Rivets are primarily used to mechanically fasten two or more pieces together. Unlike welding or gluing, rivets create a permanent joint by deforming the rivet material, ensuring a strong connection.

How is gluing used as a joining method?

• By melting materials together

• By using adhesive substances

• By welding metal parts

• By using mechanical fasteners

Answer explanation

Gluing is a joining method that involves using adhesive substances to bond materials together. This distinguishes it from methods like welding or mechanical fastening, which rely on different techniques.

In an interference fit, how are the parts held together?

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Answer explanation

In an interference fit, parts are held together by tightly fitting them together, creating a strong frictional force that prevents them from separating. This method ensures a secure connection without the need for additional fasteners.

Fill in the blank: Assembly can be made easier by heating one of the parts so it _______.

• expands

• contracts

• melts

• hardens

Answer explanation

Heating one of the parts causes it to expand, making it easier to fit together with another part during assembly. This is why 'expands' is the correct choice, as it facilitates the assembly process.

Threaded fasteners use the friction generated between ______ surfaces.

• threaded

• smooth

• rough

• polished

Answer explanation

Threaded fasteners rely on the friction generated between threaded surfaces. This friction is crucial for maintaining the tightness and stability of the fastener, making 'threaded' the correct choice.

What are rivets?

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Answer explanation

Rivets are mechanical fasteners used to join two or more materials together. They consist of a smooth cylindrical shaft with a head on one end, and are deformed on the other end to secure the materials in place.

Blind rivets can be fastened when there is access to how many sides?

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Answer explanation

Blind rivets can be fastened with access to only one side, making them ideal for applications where the opposite side is inaccessible.

What are glues or adhesives used for?

• To temporarily hold parts together

• To combine parts permanently

• To create a decorative finish

• To insulate surfaces

Answer explanation

Glues or adhesives are primarily used to combine parts permanently, creating strong bonds that hold materials together. While they can also provide temporary holds or decorative finishes, their main function is permanent adhesion.

Adhesives are chemical compounds that create ______ between surfaces.

• bonds

• gaps

• friction

• resistance

Answer explanation

Adhesives are designed to create bonds between surfaces, allowing them to stick together. This is the primary function of adhesives, making 'bonds' the correct choice, while 'gaps', 'friction', and 'resistance' do not accurately describe their purpose.