stuff from booklet Flashcards
What is most important when welding in a confined space?
Proper Ventilation
What is metal fumes fever from?
Zinc
Can a dust mask be used?
Nah
Is oxygen combustible?
Technically yeah
Are you gonna pass this test?
Yes ;)
when welding in a confined space, what is most important to have?
proper ventilation
what is brass chills and metal fumes fever from?
Zinc
Can a dust mask be used for protection from fumes and vapours?
No because the filters are too big and won’t block out the tiny particle fumes.
What kind of cylinder uses the process extrusion?
oxygen
Is oxygen combustible?
Technically yes.
Do oxygen tanks have a safety fuse plug?
No, just acetylene
What degree celsius do acetylene cylinder safety fuses melt?
100 degrees.
Acetylene gas becomes unstable at what psi?
15 psi is when it starts to get dangerous to work with, and 25 psi is unstable
Oxygen and acetylene threads
Oxygen has a right hand thread (righty tighty lefty loosey) and acetylene has left hand threads (opposite). Left hand threads have a notch to indicate what type it is.
Temperature of a neutral oxy-acetylene flame is…
5850 degrees F.
ratio of oxy-acetylene tanks
ratio for neutral flame
1-1
2.5-1
What is the shade of the welding helmet governed by?
The amount of amperage. This and the welders eyes both govern the shade of the helmet.
What is the first thing to do when attaching new tanks to regulators is…
Purging for debris?
How many types of light are emitted from welding?
three: UV, infrared, and Visible
How many volumes of acetylene can be absorbed into one volume of acetone?
25.
What kind of cylinder is a bourdon tube located in?
Oxygen
How many valves does a cutting torch have?
3
How many valves does a welding torch have?
2.
What changes AC to DC?
a rectifier
Reverse polarity is when the welding electrode is connected to the…
positive pole.
Electrode Identification
7018
70-> tensile strength
1-> Welding position
1 = all positions
2=flat and horizontal fillet
3=flat only
4=flat, horizontal, overhead, vertical down.
8-> coating polarity - flux coating
7018 settings - stick
125 amps
6010 settings - stick
90 amps
Short Circuit settings - mig
17v/170w
18v/180w
19v/200w
Spray Transfer settings - mig
24.5v/450w
Lapp Weld Joint settings - mig
17v/165w
Butt Weld Joint settings - mig
16v/155w
Fillet Weld Joint settings - mig
18v/240w
Oxy-Acetylene settings
Oxygen - 10 psi
Acetylene - 10 psi
Can all welding rods be used on alternating current?
No?
Welding wire is fed into the gude tubes by…
The Spool
What gas is used in GMAW welding
argon & carbon dioxide mixture.
DCRP is typically used for…
Both stick and mig welding
Gas flow meter/flow gauge is measured in…
C.F.M. - Cubic Feet Per Metre
Wire speed is measured in…
inches per minute
Is welding MIG in windy situations a problem?
No?
