Types of copper pipe
Type L copper tubing is thicker than Type M.
True
Brazing joints are generally stronger than soldered joints.
True
Capillary action in soldering refers to:
Flow of molten solder into joint gaps
The flame zone used in brazing is:
Inner cone
What PPE is mandatory when brazing copper pipe?
Safety glasses and welding shield
What type of copper tubing is cleaned and sealed for HVAC use?
ACR
At what temperature does soldering typically occur?
Below 840°F
Overheating during soldering can cause:
Flux to burn and fail
What is the purpose of flux in soldering?
Prevent oxidation
Why should a fire-resistant cloth or heat shield be used while brazing?
To protect nearby materials from fire
Which type of copper tubing is most commonly used for refrigerant lines?
ACR
What is the purpose of flux in soldering/brazing?
Prevent oxidation
Which tool is used to clean the inside of copper fittings?
Wire brush
What color should protective eyewear lenses be for brazing?
Dark green or blue
What is the primary hazard of brazing in a poorly ventilated space?
Poisonous fumes and oxygen displacement
What colour is the M type pipe
Green
What is the key difference between soldering and brazing?
Temperature
What should be done after soldering a joint?
Clean off excess flux
Which of the following is a safety risk when brazing?
Toxic fumes
What is the danger of applying too much solder?
Solder can drip and cause burns
What is the main difference between Type L and Type M copper tubing?
Wall thickness
Which joint type is stronger for HVAC refrigerant lines?
Brazed
What can happen if oxygen and acetylene pressures are set too high?
Flashback
Which sign shows a poor solder joint?
Burnt or blackened joint
What is used to shut off a torch in emergency situations?
Flashback arrestor