103a-bA Flashcards
To protect yourself from electrical shock when welding you must ensure that all that equipment is properly __________.
Grounded
What are the first two signs of oxygen deficiency?
A) Euphoria
B) Dizziness
What sheet of filter plate do AWS and CSA recommend as the minimum.
A) #2
B) #10
C) #11
D)#14
B) #10
What is the primary function of shielding gas?
To shield the molten weld metal from atmospheric contamination
List the two outputs produced by common welding sources
CC- constant current
CV- constant voltage
Flowmeters control the __________ of shield gas to the gun nozzle
Rate of flow
What should your protective clothing characteristics be when welding with GMAW and why?
Clothing should be dark tightly knit 100% cotton to reduce reflected light radiation, and promote fire resistance.
Is it advisable to weld with any are quoting process under wet weather conditions? explain
If you protect yourself from electrical shock hazards by wearing rubber boots with dry socks, and gloves
Name the two toxic gases that the ultraviolet light from welding will produce.
Phosgene
Ozone
How might using children cast during welding affect air quality?
Shielding gases in sufficient quantities, displace enough air to make the work area oxygen deficient.
Dizziness or euphoria is usually the first time of O2 deficiency.
Take precautions to ensure adequate breathing air is always supplied.
List the six essential equipment components always required to set up a wire feed outfit.
Power source
Wire feeder
Gun and cable assembly
Spooled, filler wire
Shielding gas
Gas control equipment
With three properties are wire feed welding power source ratings based on?
Amperage
Voltage
Duty cycle
What is the most common current that the wire processes use?
A) constant current -CC
B) constant voltage CV-(constant potential)
C) alternating current -AC
D) high frequency -hf
B) constant voltage CV-(constant potential)
A CV Power source increases or decreases the welding current to account for what?
Voltage Fluctuations
The voltage control presets the desired ________ on a CV power source.
a) voltage
b) amperage
c) WFS
d) arc length
d) arc length.
Why is a constant voltage constant speed system preferred over constant current voltage sensing systems
A) smoother arc characteristics, and consistent burn off rate
B) higher disposition rates
C) ark starting properties
D) the ability to have a longer stick out length for visibility
A) smoother arc characteristics, and consistent burn off rate
A CV power source increases or decreases the welding current to account for what?
Voltage fluctuations
The voltage control presets the desired ______ on a CV power source
voltage
amperage
WFS
arc length
Arc length
constant current machine should be equipped with _____ to be used for wire processes?
Variable speed / voltage sensing
Constant Speed
Variable speed / voltage sensing
What is the most common pull feed system?
Spool on the gun
Which system maintains arc length by automatically adjusting the amperage output as the electrode extension changes?
A) constant speed wire feeder
B) voltage sensing wire feeder
C) dual head wire feeder
D) micro processor controlled wire feeder
A) constant speed wire feeder
List the five essential components of a typical air cooled gun
Gun body
Gas diffuser
Contact tube
Nozzle
Cable assembly including conduit & liner
What is the maximum weight you can get in a bulk drum
1000 lbs
How should you store unused wire or open filler metal packaging?
A) keep them covered and away from humid environments
B) loosely set to the side for easy access
C) stacked in a designated area on the floor
D) store all the filler metals so that they are readily available
A) keep them covered and away from a humid environment