Worksheetsbrazing
Total questions: 1
Worksheet time: 7mins
What is the first step when brazing copper tubing?
Purge the air from the system
Remove any Schrader cores
Cut the copper tubing
Clean the copper with an emery cloth
What tool is used to deburr copper tubing after cutting?
Needle nose pliers
A navac deburring tool
A wrench
A torch
What is the purpose of flowing nitrogen while brazing?
To cool down the tubing
To clean the tubing
To increase the heat
To prevent oxidation inside the tubing
What is the correct setting for oxygen and acetylene when using a standard tip?
5 for both oxygen and acetylene
7 for acetylene and 11 for oxygen
7 for both oxygen and acetylene
10 for both oxygen and acetylene
What is the correct procedure to light the torch?
Oxygen first, then acetylene
Acetylene only, then mix in oxygen
Oxygen and acetylene together
Acetylene first, then oxygen
What type of flame is typically sought for brazing?
Oxidizing flame
Neutral flame
Carburizing flame
Reducing flame
What is the main reason for using wet rag heat blocking putty?
To clean the tubing
To apply flux
To protect critical system components from heat
To cool down the tubing quickly
What should not be used on steel when brazing?
Aluminum repair rod
Phosphorus bearing rods
Separate paste flux
High silver flux coated rod
What is the correct method to repair aluminum?
Use phosphorus bearing rods
Apply direct heat to the rod
Heat until the flux goes clear and quiet, then apply the rod
Use the same alloys and flux as for copper
What is the maximum test pressure for a system based on?
The lowest maximum test pressure of the evaporator or condenser
The pressure of the nitrogen tank
The highest maximum test pressure of the evaporator or condenser
The pressure setting on the regulator
