101k Flashcards
What are the grooves at the bottom of tube cutters for
Cutting flares
A flaring tool and flare is always
45°
When swedging what should you add
Oil
Annealed copper is hard of soft?
Soft
Pure acetylene is
High flammable
Colorless
Non pungent odor
Another name for acetylene tank is
B tank
When storing a cylinder always have the pressure at
0 psi
Regulators on acetylene tanks reduce psi from
250 to 15psi
Acetylene hoses are
Red
Oxygen hoses are
Green
Two types of copper
Hard drawn and soft drawn(annealed)
What is cutting fluid used for
Keep tool and material cool
Reduce power consumption
Two widths of copper
L and K
What color is k tubing
Green paint
What color is L tubing
Blue
What type of tubing do we not use in refrigeration
M and it’s red
A coupling fitting
Both sides are the same and go onto a smaller pipe
ELL 90 fitting
Both sides are the same
Street ELL 90 fitting
Both sides are different
Redcuing coupling fitting is a
Bigger fitting to smaller (5/8- 3/8)
Iron pipe is also called
Steel pipe
Iron pipe is only used with
Ammonia
Two types of iron pipe used in refrigeration
Standard schedule #40
Extra strong schedule #80
Fitting allowance is
Throw of the fitting - thread engagement
The short length of threading that goes into the fitting is called
Thread engagement
Hard soldering is also known as
Silver soldering
Hard soldering or silver soldering/brazing uses temperatures of over
800°F
Soft soldering uses temperatures under
800°F
95/5 solder composition
95% tin
5% antimony
95/5 solder flow point °F
465°F
95/5 solder can be used from copper to
Steel
Brass
Copper
The space between the pipe and the fitting is called
Capillary gap
Solder fills the gap between the pipe and fitting with
Capillary action
Do not apply flux with hands what should you use
Brush
If excessive amounts of flux is put on pipe what will happen
May cause excessive corrosion
Overheating flux can cause
Solder to not flow properly into joint
Allow joint to cool naturally, cooling it quick is called
Shock cooling
Brazing filler metals melt at temperature between °F
1100°F-1500°F
Silfos (silver alloy brazing 15) composition is
85% copper
15% silver
Use phosphorus flux
Silver alloy wires composition is
45% silver with
Copper
Zinc
Cadmium
No flux
Silver alloy wire is used to
Join ferrous and non ferrous metals that melt above 1500°
Hottest point of the torch flame
Feather
