Nissan Armada 2025-2026 Service and Repair Manual: Welding (aluminum)
To repair a crack or a hole in a steel plate, welding is usually used. Either oxygen and acetylene gas welding, arc welding, or brazing is commonly used. For aluminum alloy panels, TIG or MIG welding, which use inert gases (argon gas) as a shield gas, are usually used. This is because aluminum alloy has the following special features.
Its melting temperature is lower than iron, however the specific heat and latent heat are higher. It also has good conductivity. For these reasons, a large amount of heat must be applied in a very short time.
The melting point of aluminum alloy oxidized film is 2,020°C (3,668°F). In order to remove this film, cleaning by argon welding (TIG welding, MIG welding) or flux treatment is required.
Not removing oxidized films results in incomplete fusion or blowholes.
Heat expansion and contraction is approximately twice that of iron, which allows for easy distortion by welding.
Precautions during Assembly
When installing parts, insulating materials such as resin washers (bolts at front fender) and anti-corrosion sealant (hood hinges) are inserted between the aluminum alloy panel and steel plates to pre ...
Comparision of Chemical and Physical Properties between Aluminum and Iron
Property Aluminum alloy Iron Effect of welding Melting temperature °C (°F) 560 - 640
(1,040 - 1,184) 600 × 2.5
(1,112 × 2.5) Aluminum alloy melts before it turns red.
This makes it difficult ...
Other materials:
Removal and Installation
WARNING:
REMOVAL
CAUTION:
When washer pump is removed, washer fluid may come out so prepare a container to receive washer fluid and never allow washer fluid to be sprinkled.
Remove fender protector RH. Refer to Removal and Installation.
Disconnect front washer tube A from washer pump, washer pump t ...
Precautions for Body Repair
WARNING:
WARNING:
The repair information in this section is intended for trained body repair technicians who have attained a high level of skill and experience (e.g. ASE Collision Repair Certification, I-CAR Professional Development Program [PDP] training, etc.) in repairing collision damaged vehicl ...
Removal and Installation
REMOVAL
Remove drain assembly. Refer to Removal and Installation.
Remove sunshade. Refer to Removal and Installation.
Remove side trim and glass lid guide from moonroof frame assembly.
Remove side trim from glass lid guide.
INSTALLATION
Note the following items, and then install in the reverse o ...
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