Plastic repair/ plastic welding
Dacromet coatings on steel bolts:
Cannot be repaired if damaged
Which of these is the first step for plastic welding repairs?
Clean with soap and water
When preforming a rod adhesion test, the rod to use should be the rod that:
sticks
Technician A says that GMA (MIG) aluminum welding equipment uses a lower current compared to welding steel. Technician B says that GMA (MIG) aluminum welding equipment uses dedicated liners. Who is right?
B only
Technician A says that a seam ia a visual indicator of an extrusion. Technician B says that extrusions have limited reparability. Who is right?
B only
When working with aluminum and using heat, the recommended temperatures should be between:
400- 570 degrees F
An SMC decklid has exposed fibers in the damaged area. Technician A says that masking tape may be needed to cover the damage during the initial cleaning process. Technician says that wax and grease remover may be recommended for the initial cleaning. Who is right?
A only
Technician A say vehicle-specific training is available from Ferrari. Technician B says I-CAR offers training on GTA (TIG) welding. Who is right?
A only
Technician A says that a magnet may help identify an aluminum part. Technician B says that clinches cannot be used on aluminum parts. Who is right?
A only
Technician A says that a plastic fascia containing two ISO codes indicates a blend of two different plastics. Technician B says that ISO codes are found on the front side of a plastic part. Who is right?
A only
Technician A says that a rod adhesion test is designed to determine which welding rod sticks best. Technician B says that a rod adhesion test is designed to determine if a plastic is a polyolefin. Who is right?
A only
Technician A says that adhesion promoter is applied to bare plastic areas. Technician B says that adhesion promoter should be scuffed before applying repair. Who is right?
A only
Technician A says that adhesives may be used on the backside. Technician B says that a filler-only product may be used on the backside. Who is right?
A only
Technician A says that aluminum outer panels may be used on vehicles with steel inner structures. Technician B says that aluminum panels are typically 2.5 times thicker than a mild steel equivalent panel. Who is right?
A only
Technician A says that bolt-on aluminum crush tubes are designed to absorb collision energy in a low-speed frontal impact. Technician B says that bolt-on aluminum crush tubes are sacrificed in a low-speed frontal impact to protect the upper rails. Who is right?
A only
Technician A says that cold straightening may be used if working around adhesives. Technician says that aluminum will change color when heated. Who is right?
A only
Technician A says that heat-treatable alloys use the temper designation "H". Technician B says that the higher the number following the temper designation, the stronger the material. Who is right?
A only
Technician A says that one of the reasons for applying aluminum body tape is to align the pieces. Technician B says that aluminum body tape serves as a permanent reinforcement in a plastic weld. Who is right?
A only
Technician A says that some vehicle makers do not make outer door replacement panels available. Technician B says that damaged door intrusion beams should be straightened. Who is right?
A only
Technician A says that the ISO code may be molded into the backside of a part. Technician B say that ISO codes are found on all plastic parts, but in different locations. Who is right?
A only
Technician A says that when repairing carbon fiber parts, it may be recommended to use a pyramid patch. Technician B says that when repairing carbon fiber parts, it may be recommended to use pinning. Who is right?
A only
Technician A says vehicle-specific training may require attending a GMA (MIG) aluminum welding qualification program. Technician B says vehicle-specific training is not required to join an aluminum repair network. Who is right?
A only
Spring-back is:
straightened metal wanting to return to the damaged state after straightening.
Technician A says that aluminum tape is used as a permanent backing for FRP repairs. Technician B says that a backing is needed on two-sided FRP repairs. Who is right?
B only
Technician A says that an adhesive-only product typically has better sanding characteristic than a filler-only product. Technician B says that some types of body fillers shoud only be used to repair metal body panels. Who is right?
B only
Technician A says that backside plastic repair adhesive may sand easier that front side repair materials. Technician B says that some plastic repair adhesives may be used as plastic repair fillers. Who is right?
B only
Technician A says that body fillers designed for metal may also be used when making plastic repairs. Technician B says that adhesion promoter may be recommended before applying filler to a plastic part. Who is right?
B only
Technician A says that cleaning the melt tube on an airless welder helps ensure that the weld is not contaminated. Technician B says that cleaning the shoe on an airless welder helps ensure that the heat setting is accurate. Who is right?
B only
Technician A says that clinches on aluminum panels may be duplicated in a repair facility. Technician b says that slot fillet welds on aluminum panels may be duplicated in a repair facility. Who is right?
B only
Technician A says that cracks i structural parts may be welded depending on the damage location. Technician B says that cracks in the welds of structural parts may be repaired. Who is right?
B only
Technician A says that fillers may be applied over melted plastic. Technician B says that the weld area should be featheredged. Who is right?
B only
Technician A says that galvanic corrosion occurs when galvanizing breaks down. Technician B says that galvanic corrosion produces a white ash-like residue. Who is right?
B only
Technician A says that hot air welders may be used on a SMC part. Technician B says that hot air welders use a filler rod as part of the repair process. Who is right?
B only
Technician A says that pinning is used for one-sided repairs. Technician b says that pinning is used for tab repairs. Who is right?
B only
Technician A says that plastic repair adhesives may be applied over a painted area. Technician says that melted plastic may cause poor adhesion to the plastic repair adhesives. Who is right?
B only
Technician A says that sheet-molded compound (SMC) parts may be repaired using plastic welding. Technician B says that sheet-molded compound (SMC) parts may require finish sanding on both sides of the repair. Who is right?
B only
Technician A says that static mixers waste a lot of product. Technician B says that a static mixer helps prevent air bubbles. Who is right?
B only
Technician A says that stationary glass is not a structural part of a vehicle. Technician B says that non-conductive urethane may be recommended for stationary glass installation. Who is right?
B only
Technician A says that wicking is the process of drilling holes in the repair taper. Technician B says that exposed fibers should be taped off before cleaning. Who is right?
B only
Technician A says the pinning holes for a tab repair should be drilled 1/8 inch's apart. Technician B says that all of the pinning holes for a tab repair should be within the repair taper. Who is right?
B only
Technician A says that SMC is smooth on both sides. Technician B says that SMC may require finish sanding both sides. Who is right?
Both
Technician A says that a backing is required for a two-sided repair on a fiber-reinforced plastic part. Technician B says that a scrap piece of the same material may be used as a backing for a two-sided repair on a fiber-reinforced plastic part. Who is right?
Both
Technician A says that a damaged plastic part should be cleaned with soap and water before beginning repairs. Technician B says that a damaged plastic part should be cleaned with a water-based cleaner before beginning repairs. Who is right?
Both
Technician A says that adhesion promoter should be applied to PP. Technician B says that adhesion promoter is applied after the surface has been sanded. Who is right?
Both
Technician A says that aluminum repair networks may have dedicated non-structural repair facilities. Technician B says that aluminum repair networks may supply transportation for structurally damaged vehicles. Who is right?
Both
Technician A says that aluminum structural straightening may not be recommended on some vehicles. Technician B says that bent structural extrusions should be returned to original shape and state. Who is right?
Both
Technician A says that an IR lamp can be used to reshape plastic parts. Technician B says that a heat gun can be used to reshape plastic parts. Who is right?
Both
Technician A says that an RRIM part may be repaired using adhesives. Technician B says that an RRIM part may be repaired using an airless plastic welder. Who is right?
Both
Technician A says that before applying adhesive from a dual-cartridge, the plungers should be leveled. Technician B says that before applying adhesive from a dual-cartridge, a bead should be run through the static mixing nozzle. Who is right?
Both
Technician A says that carbon fiber dust may short out electric tools. Technician B says that exposed carbon fiber may cause galvanic corrosion. Who is right?
Both
Technician A says that coated fasteners may be one-time use. Technician says that weld-on pins for self-piercing rivet removal are considered consumables. Who is right?
Both
Technician A says that cracks, tears, and punctures are considered two-sided damage. Technician B says that two-sided damages require a backing material. Who is right?
Both
Technician A says that flexible polyester filler designed for plastic may be used to repair minor imperfections and scratches. Technician B says that flexible polyester filler designed for plastic may be used as an adhesive on the backside. Who is right?
Both
Technician A says that heating and reshaping should be done before other repairs. Technician says that semi-rigid plastic parts may be reshaped with an infrared lamp. Who is right?
Both
Technician A says that panel attachment methods may influence what repair methods are used. Technician B says that repair methods may cause cracks and tears in an aluminum part. Who is right?
Both
Technician A says that pinning is used on tab repairs to increase strength. Technician says tat a taper is used on tab repairs to allow for expansion and contraction. Who is right?
Both
Technician A says that plastic welding is primarily for repairing cracks that extend to the edge of a part. Technician B says that thermoplastic olefin (TPO) parts may be repaired using a nitrogen hot air welder. Who is right?
Both
Technician A says that replacing some aluminum structural parts may require rivets and adhesive. Technician B says that sectioning when there is no recommendation is a business decision that is subjective. Who is right?
Both
Technician A says that some vehicle makers may recommend a pyramid patch. Technician B says that to make a pyramid patch, layers of the repair product and fiber cloth are alternated. Who is right?
Both
Technician A says that the backside of a two-sided repair my require tapering. Technician B says that the front side of a two-sided repair may require tapering. Who is right?
Both
Technician A says that the front side of a two-sided repair requires sanding before applying repair material. Technician B says that the backside of a two-sided repair requires sanding before applying an adhesive. Who is right?
Both
Technician A says that the plungers on a dual-cartridge adhesive should be leveled before each use. Technician B says that a bead should be run out through the ststic mixer before application. Who is right?
Both
Technician A says that the welding shoe on an airless welder should be cleaned to avoid contamination. Technician B says that an airless welding shoe should be cleaned with P220 grit sandpaper. Who is right?
Both
Technician a says that bodyline areas on aluminum exterior panels are work hardened during manufacturing. Technician B says that panel edges that are damaged may crack during the repair process. Who is right?
Both
Which of these is the same for repairing sheet metal and repairing plastics?
Both must be properly cleaned
When choosing a plastic welding rod:
use the same rod as the ISO code.
The nitrogen hot air welding process:
uses nitrogen as a shielding gas
Which of these rivet removal processes has the greatest chance of introducing galvanic corrosion?
Grinding
All of these vehicle makers have aluminum repair networks EXCEPT: Jaguar. Lamborghini. Honda Mercedes-Benz.
Honda
Technician A says that a corvette ZR1 carbon fiber fender with a crack that extends to an edge may be repairable. Technician says that exposed weave carbon fiber may be buffed if the scvratch is through the clearcoat. Who is right?
Neither
Technician A says that a non-polyolefin usually smears when sanded. Technician B says that a polyolefin usually creates a powdery dust when sanded. Who is right?
Neither
Technician A says that a paint maker's adhesion promoter may be used before a plastic plastic repair adhesive is applied. Technician B says that a plastic adhesion promoter and a plastic repair adhesive from different product makes may be used together. Who is right?
Neither
Technician A says that adhesion promoters may be used on fiber-reinforced plastics. Technician B says tat some plastic repair material can be used to fill minor scratches. Who is right?
Neither
Technician A says that an ISO code identifies the flexibility of a plastic part. Technician B says that an ISO code identifies the color of a plastic part. Who is right?
Neither
Technician A says that conventional fiberglass repair material can be used to repair SMC. Technician B says that pinning is used to strengthen repairs to fiber-reinforced plastic. Who is right?
Neither
Technician A says that when flame treating a plastic part, the plastic should be melted to improve adhesion. Technician B says that when flame treating a plastic part, an oxyacetylene torch should be used. Who is right?
Neither
Which of these will usually require an adhesion promoter?
Polypropylene (PP)
Kinked structural stampings are:
replaced
Which of these is a fiber-reinforced plastic?
SMC
Aluminum exterior body panels that have been bake hardened are generally what temper?
T6
Which of these is a characteristic of a hot air welder?
Uses compressed air
All of these may be used for a two-sided adhesive repair EXCEPT: a backing. a V-groove. aluminum tape. a dual-action sander.
a V-groove
When reshaping a plastic part, all of these heat sources may be used EXCEPT: an infrared lamp. a heat gun. a propane torch. hot water.
a propane torch
Self-piercing rivets:
require a special tool for installation.
Bolted crush boxes are:
sacrificial.
A universal flat plastic ribbon is used for:
an adhesion plastic weld.
Damaged aluminum castings
are not repairable
After sanding the filler during a one-sided SMC fender repair, the repair area should be:
cleaned with a vacuum.
The first step when repairing two-sided damage on an FRP part should be:
cleaning with soap and water
Compared to steel, when straightening an aluminum structure, use:
counter anchoring
Aluminum full frame structures main aprts are:
extruded
Dissimilar metals coming in contact with each other and an electrolyte may cause:
galvanic corrosion.
A backing is applied:
inside the tapered area.
All of these are reasons that carbon fiber is used EXCEPT: lightweight. low impact strength. appearance. can be formed into complex shapes.
low impact strength
All of these may be used during a plastic welding repair EXCEPT: metal window screen. nylon window screen. aluminum body tape. a filler rod
nylon window screen.
Bumper covers are commonly made from:
polypropylene (PP).
One-sided damage to a polypropylene bumper cover may require all of these EXCEPT: an adhesion promoter. a repair taper. a filler-type material. reinforcement tape.
reinforcement tape.
Kinked structural aluminum parts should be:
replaced
All of these may cause adhesion problems with a polyolefin part EXCEPT: applying heavy coats of adhesion promoter. using a solvent-based cleaner. using aluminum tape to align the repair. smearing the plastic when making a repair taper.
using aluminum tape to align the repair.
The characteristic of aluminum to gain strength and increase brittleness when bent is called:
work hardening
