Deck 13: Plastic Repair

Question 1

Adhesives are usually used for repairing minor cuts and cracks in plastic parts.

Answer 1

True

Question 2

A reliable means of identifying an unknown plastic is to make a weld rod adhesion test or a trial-and-error weld on a hidden or damaged area of the part.

Answer 2

True

Question 3

When welding plastic, the welding rod must be compatible with the base material in order for the strength, hardness, and flexibility of the repair to be the same as the part.

Answer 3

True

Question 4

____ are shaped to tack weld broken sections of plastic together before welding.

A) Tacking tips
B) Bolts
C) Thermoplastics
D) Backing strips

Question 5

Handheld ultrasonic welding systems are available in 60 and 80 kHz frequencies.

Question 6

On long tears where backup is difficult, small ____ can be made to hold the two sides in place before doing the permanent weld.

A) bolts
B) tack welds
C) strut rods
D) nuts

Question 7

Airless plastic welding is almost obsolete now with nitrogen welding being the top choice of collision repair technicians.

Question 8

____ are blends of different plastics and other ingredients designed to achieve specific performance characteristics.

A) Carcinogens
B) Frames
C) Sheet molded compounds
D) Composite plastics

Question 9

A _______ is perfect for holding broken tabs in place or tears on a plastic part in place while making repairs.

A) Hot plastic stapler
B) Airless welder
C) Nitrogen plastic welder
D) Ultrasonic welder

Question 10

All plastics can be welded.

Question 11

____ uses heat and sometimes a plastic filler rod to join or repair plastic parts.

A) Thermosetting
B) Plastic welding
C) Tacking
D) Bonding

Question 12

It is environmentally unsound to burn plastics.

Question 13

The process of drilling small holes along the edge of the repair tapered area is known as?

A) rodding
B) mining
C) tabbing
D) pinning

Question 14

____ relies on high-frequency vibratory energy to produce plastic bonding without melting the base material.

A) Ultrasonic plastic welding
B) Drill welding
C) Thermosetting
D) Melt-flow plastic welding

Question 15

Two-part adhesive systems consist of a base resin and a hardener (catalyst).

Question 16

One of the problems with hot-air welding is that the plastic welding rod is often thinner than the panel to be welded.

Question 17

____ uses a tool with an electric heating element to produce hot air (450° to 650°F or 232° to 345°C) that blows through a nozzle and onto the plastic.

A) Ultrasonic welding
B) Melt-flow plastic welding
C) Hot-air plastic welding
D) Drill welding

Question 18

All of the following are examples of plastic parts EXCEPT:

A) dollies
B) stone shields
C) bumpers
D) fender extensions

Question 19

_______ uses a shielding gas around the weld site and allows for a noncontaminated weld.

A) Hot Air Welder
B) Nitrogen Welder
C) Airless welder
D) Plastic welder

Question 20

Two-part adhesive systems have not been accepted as an alternative to welding for many plastic repairs.

Question 21

Which of the following is LEAST-Likely one of the steps in making a fiberglass core?

A) Place pieces of fiberglass veil over the waxed or waxed paper surface.
B) Apply resin/hardener to the veil material.
C) Remove the mold core from the model.
D) Weld the core piece in place.

Question 22

____________________ is the tendency of a plastic piece to keep or return to its original molded shape.

Question 23

A ____ is bonded to the back of the repair area to restore the reinforced plastic's strength.

A) drill pad
B) molded core
C) backing strip
D) bolt

Question 24

____ are used when the part cannot be removed from the vehicle.

A) Single-sided plastic welds
B) Flame cones
C) Sheet metal
D) Ground clamps

Question 25

The term MOST-Likely used to describe surface damage that does not penetrate or fracture the back of the panel is:

A) cosmetic damage
B) single-sided damage
C) exterior damage
D) structural damage

Question 26

____________________ can be repeatedly softened and reshaped by heating, with no change in their chemical makeup.

Question 27

The term MOST-Likely used to describe a soft, flexible, thin plastic material often applied over a foam filler is:

A) vinyl
B) dolly
C) backing strip
D) molded core

Question 28

______________________________ undergo a chemical change by the action of heating, a catalyst, or ultraviolet light.

Question 29

Which of the following is LEAST-Likely a type of reinforced plastic?

A) Fiber-reinforced plastic
B) Sheet-molded compound
C) Vinyl
D) Reinforced reaction injection-molded polyurethane

Question 30

While having a discussion, Technician A says that the cure time of some adhesives used in reinforced plastic repair can be shortened with the application of heat.Technician B says that temperature and humidity can affect work life and cure time.Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 31

What factors should you bear in mind when using plastic repair adhesives?

Question 32

Using your hands to flex and bend the part and compare it to the flexibility of samples of plastic is called a(n) _______________.

Question 33

A(n) _________________________ is a chemical that treats the surface of the plastic so the repair material will bond properly.

Question 34

____ is an airless welding method and can be utilized for both single-sided and two-sided repairs.

A) Metal-flow plastic welding
B) Plastic speed welding
C) Melt-flow plastic welding
D) Plastic stitch-stamp welding

Question 35

While having a discussion, Technician A says that there are two methods of separating door pieces: heat and a claw hammer.Technician B says that the methods involve the use of: heat and a putty knife or an air chisel.Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 36

Describe mill and drill pads and their use

Question 37

When making a two-sided repair, Technician A says this type of weld is strongest because you weld both sides of the repair.Technician A says that you do not have to sand and shape the backside of this type of repair.Who is right?

A) A only
B) B only
C) Both A and B
D) Neither A nor B