Soldering and Brazing
Type M copper water tube indicates a ___ wall thickness.
A.) Light
B.) Medium
C.) Reinforced
D.) Heavy - Answer-Light
The assembly of a joint should be firmly supported to maintain proper alignment during the ___ process.
A.) Soldering
B.) Brazing
C.) Oxidation
D.) Embrittlement - Answer-Brazing
Shiny areas on the inside of a soldered joint indicate ___.
A.) The joint was perfectly soldered
B.) Improper heating of the joint of fitting
C.) The flux properly coated the tube and fitting
D.) An inadequate amount of solder was used - Answer-An inadequate amount of solder was used
Wiping a joint while it is still hot can cause a crack in the bond between the solder and the base metal.
(T of F) - Answer-True
Fluxes can be classified in ___ general groups.
A.) 5
, B.) 4
C.) 2
D.) 3 - Answer-3
The distinction between seamless copper tube and pipe is important because they are made to the
same specification standard but have different uses. (T or F) - Answer-False
Melting flux is the indicator to ___.
A.) Slowly remove heat from the joint
B.) Stop feeding the filler metal
C.) Start feeding the filler metal
D.) Rapidly remove heat from the joint - Answer-Start feeding the filler metal
The degree of carburization of a torch's flame can be readily determined by the ___.
A.) Aroma produce by the flame
B.) Relative length of the whitish acetylene streamers
C.) Amount of oxygen coming from the torch
D.) Amount of acetylene coming from the torch - Answer-Relative length of the whitish acetylene
streamers
The primary purpose of a flux is to chemically clean the surface of the tube and fittings before they are
cleaned by the use of abrasive materials such as Scotchbrite cleaning pads (T or F) - Answer-False
A cutting wheel should be lubricated before cutting a tube to be brazed. (T or F) - Answer-False
Sparks will retain their heat for several __________, which is often enough time to ignite combustible
materials.
Type M copper water tube indicates a ___ wall thickness.
A.) Light
B.) Medium
C.) Reinforced
D.) Heavy - Answer-Light
The assembly of a joint should be firmly supported to maintain proper alignment during the ___ process.
A.) Soldering
B.) Brazing
C.) Oxidation
D.) Embrittlement - Answer-Brazing
Shiny areas on the inside of a soldered joint indicate ___.
A.) The joint was perfectly soldered
B.) Improper heating of the joint of fitting
C.) The flux properly coated the tube and fitting
D.) An inadequate amount of solder was used - Answer-An inadequate amount of solder was used
Wiping a joint while it is still hot can cause a crack in the bond between the solder and the base metal.
(T of F) - Answer-True
Fluxes can be classified in ___ general groups.
A.) 5
, B.) 4
C.) 2
D.) 3 - Answer-3
The distinction between seamless copper tube and pipe is important because they are made to the
same specification standard but have different uses. (T or F) - Answer-False
Melting flux is the indicator to ___.
A.) Slowly remove heat from the joint
B.) Stop feeding the filler metal
C.) Start feeding the filler metal
D.) Rapidly remove heat from the joint - Answer-Start feeding the filler metal
The degree of carburization of a torch's flame can be readily determined by the ___.
A.) Aroma produce by the flame
B.) Relative length of the whitish acetylene streamers
C.) Amount of oxygen coming from the torch
D.) Amount of acetylene coming from the torch - Answer-Relative length of the whitish acetylene
streamers
The primary purpose of a flux is to chemically clean the surface of the tube and fittings before they are
cleaned by the use of abrasive materials such as Scotchbrite cleaning pads (T or F) - Answer-False
A cutting wheel should be lubricated before cutting a tube to be brazed. (T or F) - Answer-False
Sparks will retain their heat for several __________, which is often enough time to ignite combustible
materials.
