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44 Cards in this Set
- Front
- Back
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how does a push-pull system work |
feeders in the gun pull the wire while simultaneously pushing the wire from the feeder
pg31 |
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What does a push pull system allow for? |
allows for greater machine to work distances
Pg 31 |
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where are the drive rolls located in a pull system? |
in the gun
pg 31 |
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what type of wires is the pull system preferred for? |
small diameter or soft electrode wires
pg 31 |
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what power can a pull system use? a) constant current b) constant voltage c) both |
c) both (constant current or constant voltage)
pg 31 |
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How are filler wires made? |
Drawn into continuous lengths (from the same batch to keep a uniform chemical composition)
pg 3 |
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what range of diameters can wires come in? |
0.5mm-3.2mm (0.020" -1/8")
pg 3 |
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what does not influence the selection of a filler wire? a)base metal chemistry b)the shielding gas c)type of metal transfer d)type of welding machine e)service requirements f)condition of the base metal g)welding position |
d) type of welding machine
pg 5 |
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In ER70S-G what does the G stand for? |
general classification
pg 11 |
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Name two functions of the Flux? |
-provides deoxidizers and scavengers to remove impurities -form a slag cover-prevent contamination -act as an arc stabilizer -add alloying elements -provide a shielding gas
pg 15 |
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what units does CSA measure tensile strength in? |
mPa-(metric) mega pascals
pg 17 |
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what units does AWS measure tensile strength in? |
psi - (imperial) pressure per square inch
pg17 |
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What numbers do CSA use to classify welding position and which one is which? |
1-all positions 2-flat and horizontal
pg 17 |
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What numbers do AWS use to classify welding position and which one is which? |
0-flat and horizontal 1-all positions
pg17 |
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where in the wire does metal core wire carry current? |
the metal sheath (the outside)
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what type of penetration profile do MCAW wires create? |
wide penetration profile |
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what shape of Arc do MCAW wires create? |
a cone shaped arc |
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12-22 arc volts is what mode of metal transfer? |
short circuit transfer
pg 25 |
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describe the process of short circuit metal transfer? |
-wire comes into contact with the workpiece -magnetic buildup causes pinching effect separating the the wire from the puddle -start the process over
pg 25 |
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what is short circuit metal transfer ideal for? |
joining light gauge metals and poor fit ups
pg 25 |
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what is the voltage range of Globular Transfer? |
22-26 Arc Volts
pg 26 |
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What size are globules from globular transfer in relation to the wire diameter? |
larger than the wire diameter
pg 26 |
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why is globular transfer generally avoided in GMAW? |
spatter problems and poor weld appearance
pg 26 |
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What is electrode extension? |
Distance from the end of the contact tip to the end of the electrode.
pg 45 |
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what happens to the arc voltage when electrode extension increases? |
when extension increases - Arc voltage lowers
pg 46 |
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what happens to the weld bead if your electrode extension increases? |
lower arc voltage increases weld bead convexity
pg 45 |
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what process is the pulse arc generally used for? |
MCAW - positions other than Flat and horizontal.
pg 27 |
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what are inverter type power sources capable of that makes them good for pulse arc transfer? |
Capable of very fast response times and accurate current control
pg 27 |
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what is the recommended distance for a push system? |
15 feet
pg 30 |
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where are the drive rolls located in a push system? |
In the Wire feed unit
pg 30 |
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what does each part Stand for (FCAW-CSA)
F 49 1 T - 6 CH a-b--c-d---e--f |
a)F - Electrode b)49 - Minimum tensile strength (MPa) c)1 - Position d)T-metal core wire or tubular/Flux core wire e)6-slag system, current, polarity, shielding gas f)optional controlled hydrogen designator
pg 18 |
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what does each part stand for (FCAW-AWS)
E - X X T - X M J HZ a--b c d---e--f-g--h |
a)E- electrode b)X-Maximum Tensile strength (psi) c)X-Position d)T-Tubular Flux core wires e)X-usability and performance characteristics f)M-designates whether argon/CO2 or CO2/self shielded g)J-optional Improved toughness value designator h)H-optional controlled hydrogen designator
pg 18
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what Does DCEN stand for? |
Direct Current Electrode negative
pg 44 |
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what polarity is DCEN? |
Straight polarity
pg 44 |
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where is 2/3 of the arc energy in a DCEN system? |
in the electrode
pg 45 |
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what does DCEP stand for? |
Direct Current Electrode Positive
pg 44 |
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what polarity is DCEP? |
reverse polarity
pg 44 |
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where is 2/3 of the energy in a DCEP system? |
in the work piece
pg 45 |
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AC is not used a lot with wire feed welding due to its problems with Arc Stability. a) True b) False |
a) True
pg 45 |
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which system has better penetration: a)DCEN b)DCEP |
b)DCEP
pg 45 |
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How does a Voltage Sensing Wire Feeder work? |
arc voltage change caused by the change in electrode extension is sensed by the motor drive and it adjusts the wire speed to maintain the arc length.
pg 38 |
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How does a constant speed wire feeder work? |
the system maintains the arc length by automatically adjusting the amperage output as the electrode extension changes.
pg 37 |
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What does each letter stand for (GMAW-CSA)
B - G 49A 3 C G6 a---b--c----d e--f |
a)B-Electrode impact test Average b)G-welding process c)49A-Tensile strength (MPa) d)3-average temperature of impact test e)C-Shielding gas to be used f)G6-chemical analysis of the electrode
pg 8 |
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what does each letter stand for (GMAW-AWS)
ER 70 S - XNHZ -a--b--c
E70C- X Y N HZ ---------d-e-f---g |
a)ER-filler rod or electrode b)70-minimum tensile strength (psi) c)S-Solid or composite filler metal d)X-Chemical composition e)Y-types of shielding gas used for classification f)N- N when unclear application g)HZ- optional supplemental diffusable hydrogen designator
pg 9 |
