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36 Cards in this Set
- Front
- Back
Name 2 toxic fumes produced by ultraviolet light. |
-ozone -phosegene gas
pg 3 |
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What is the primary function the shielding gas? |
prevents atmospheric contamination
pg 13 |
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what is one of the three variable shielding gas can effect? |
-mode of metal transfer -arc stability -penetration
pg 13 |
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The powder in a MCAW Wire consists mostly of: a)Flux b)Metal c)Slag Formers d)Arc Stabilizers |
b)metal
pg 10 |
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Name 3 parts of the the wire feed welder |
power source wire feed electrode holder & cable assembly spooled filler wire regulator / Flow meter shielding gas a cooling system if required
|
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Amperage controls what? |
-Burn off -Penetration
pg 16 |
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voltage controls what? |
-Arc stability -aids in starting the arc
pg 16 |
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what does the Regulator do? |
the regulator brings the gas to a working level
pg 13 |
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what does the flow meter do? |
the flow meter controls how much gas glows to the Gun.
pg 13 |
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what governing body sets power source specifications. |
National Electrical Manufactures Association (NEMA)
pg 15 |
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what are the power sources rated based on? |
-Amperage -Voltage & -duty cycle
pg 15 |
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what is the electrode extension range for self-sheilded FCAW? |
3/4" - 3 3/4"
pg 9 |
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Define & Desribe the GMAW process. |
GMAW - Gas Metal Arc Welding
-Electric arc heats metal from a electrode (continuously fed) to join metals
-Shielding gas prevents contamination from outside air
pg 6 |
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List 3 advantages of GMAW. |
Advantages -lower skill required -excellent for light gauge metals -good arc control for poor fit-ups -less heat input = less distortion -high production rates -high deposition rates -no slag to remove, little post weld cleanup
pg 19 |
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list 3 disadvantages of GMAW |
Disadvantages -higher initial cost -requires more maintenance -lack of fusion -cannot be used out doors & drafty locations -High radiant energy -wire feeder must be in close proximity |
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one of the main advantages of metal core wire is: a) lower cost than flux core wires b) no external shielding gas is required c) designed for use on conventional CC power sources d) higher deposition rates |
d) high deposition rate
pg 21 |
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what are the principles of FCAW? |
-Uses a flux core arc to join metals -electrode consumable (continuously fed) -settings maintained by the operator -shielding gas can be obtained from an external source or/and from within the electrode
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A welding machine that produces an almost horizontal slope is a: a) Constant Current b) Constant Voltage c) Rising Arc Voltage d) High Amperage Potential |
b) Constant Voltage
pg 17 |
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what type of amp curve does a constant current machine produce? a) Flat b) Variable c) Rising d) Drooping |
d) Drooping
pg 16 |
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what is a common power source on GMAW welding machines? |
Constant Voltage
pg 15 |
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constant voltage machines produce a: a) drooping volt curve b) rising volt curve c) relatively flat volt-amp curve d) constantly changing volt-amp curve |
c) relatively flat volt-amp curve
pg 21 |
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power source best suited for the short - circuit mode of metal transfer is a: a) rising arc voltage power source b) constant voltage power source c) constant current power source d) constant amperage power source |
b) constant voltage power source
pg 16 |
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How can air quality be affected when welding with shielding gases. |
-can cause displacement of oxygen -oxygen deficiency |
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GMAW is also known as? |
MIG Welding |
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self shielded FCAW use shielding generated from: a) a base metal b) an external source c) the flux d) a past flux applied to the base metal before welding |
c) the flux
pg 9 |
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GMAW is recomended for use on which of the following metals? a) stainless steel b) aluminum c) copper alloys d)carbon and low alloys steels e) all of the above |
e) all of the above |
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the MCAW process uses the same equipment as? a) SMAW b) GTAW c) FCAW d) OAW |
c) FCAW
pg 10 |
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How are wire feed guns rated? |
by current carrying capacity
pg 13 |
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welding power designed for wire feed can be used for SMAW? a) True b) False |
b) False
pg 16 |
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GMAW may be used in semi-automatic or automatic operation modes? a) True b) False |
a) True
pg15 |
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Major factor in choosing air cooled gun / water cooled gun is a) shielding gas b) current/voltage c) joint design d) base metal alloy |
b) current/voltage
pg 14 |
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a potential source of chemical fumes when welding is: a) Inert Shielding gases b) Chlorinated degreasing solvents c) Carbon dioxide extinguishers d) Anti-spatter nozzle sprays |
b) chlorinated degreasing solvents
pg 3 |
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The use of shielding gases increases the need for? a) Lighting b) Ventilation c) Heat shielding d) Eye protection |
b) Ventilation
pg 3 |
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what color should you welding clothing be and why? |
dark colored to reduce reflected light
pg 3 |
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Name 3 advantages of FCAW. |
-the deposition rate is greater than SMAW -there is a high operator factor, easily mechanized - the visible arc is easy to use -the weld deposits are high quality
pg 20 |
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Name 3 disadvantages of FCAW. |
-Equipment is more expensive to purchase -more smoke and fumes are generated -wire feeder must be in close proximity -equipment is more complex/ requires more maintenance
pg 20 |