120103k Flashcards
1
Q
Describe and explain the principles of operation of SAW
A
SAW uses an electric arc established between a continuously fed bare metal consumable electrode or electrodes and the work. Shielding is provided by a granular, reuseable flux material usually brought to the work area using a flux fled system.
2
Q
What positions can SAW be used in?
a) flat position only
b) flat and horizontal positions
c) flat and vertical positions
d) flat, horizontal, and vertical positions
A
b) flat and horizontal positions
3
Q
Name 4 types of materials that SAW can be used on.
A
carbon
alloy steels
stainless steels
nickel alloy
4
Q
List 7 basic equip components required for SAW set up briefly explain the functions
A
- The welding power source provides welding current
- The welding head assembly includes the wire feeder, torch assembly and travel carriage (machine and auto operation)
- The fixtures and positions position the work piece for welding
- Spooled filler wire provides shielding, shapes the bead and allows alloys to be added
- The flux provides shielding, shapes the bead and allows alloys to be added
- the flux feed and recovery equip conveys flux to the weld zone and collects unused flux
- The work lead completes the welding current circuit to the work piece
5
Q
What are the advantages of using a screw type work clamp with SAW
A
- it provides a strong and positive contact to the work
it minimizes heat build up
6
Q
What type of output slope do SAW power sources use?
a) CC
b) CV
c) variable potential
d) CC & CV
A
d) CC & CV
7
Q
What duty cycle rating is recommended for most SAW power sources
a) 40%
b) 60%
c) 80%
d) 100%
A
d) 100%
8
Q
SAW may be used in the semi automatic or automatic operation modes
true/ False
A
True
9
Q
What is the advantage of using an ac power source for SAW?
a) It uses less power than DC equip
b) the arc is more stable than dc current
c) it minimizes arc blow with multiple wire setups
d) AC power sources have higher duty cycle ratings than dc machines
A
c) it minimizes arc blow with multiple wire setups
10
Q
What will usually result if the drive roll pressure is set to low
a) the wire electrode will slip and feed erratically
b) the wire can pile up inside the wire feed unit
c) the wire will stub the work piece
d) the wire will freeze to the work piece
A
a) the wire electrode will slip and feed erratically
11
Q
How will the arc react if the flux layer is to shallow?
a) the weld bead will appear rough and ropy
b) the weld bead will have worm holes in it
c) the weld will be flashing and will likely result in porosity
d) the space between two unrestrained loops of wire
A
Needs answer. Believed to be c
12
Q
Which is helix:
a) straightening of the wire before it enters the drive roll assembly
b) the diameter of a single loop of wire
c) the turning action of the wire as it unrolls
d) the space between 2 unrestrained loops of wire
A
d) the space between 2 unrestrained loops of wire
13
Q
What type of drive rolls are normally used with SAW?
a) angled
b) U-groove
c) flat or smooth faced
d) knurled or V-groove
A
d) knurled or V-groove
14
Q
What type of wire feed set up is used with CV power sources?
a) constant speed
b) voltage sensing
c) amperage sensing
d) arc force controlled
A
a) constant speed
15
Q
List 6 of the main SAW operating variables and their effects.
A
- amperage controls penetration and rate of deposit
- Voltage affects arc length
- Travel speed affects the penetration and well bead profile
- Electrode diameter has a direct effect on the weld bead shape, depth of penetration and weld metal deposition rates
- Electrode extension affects rate of metal deposition and affects rate of metal deposition rates
- Width and dept of flux layer has an influence on arc action, bead appearance and weld metal soundness
16
Q
To increase arc length when you are welding with SAW, you would
a) use a longer contact tip
b) increase WFS
c) increase arc voltage
d) use a shorter contact tip
A
c) increase arc voltage
17
Q
When using SAW an increase in the arc voltage produces
a) wider arc stream and shallower penetration
b) wider arc stream and deeper penetration
c) narrower arc stream and shallower penetration
d) narrower arc stream and deeper penetration
A
a) wider arc stream and shallower penetration
18
Q
When is DCEN used with SAW
a) when deeper penetration is required
b) when welding on nonferrous materials
c) when shallower penetration is required
d) for applications requiring more than 1500 amps
A
c) when shallower penetration is required
19
Q
Why are wire cast and helix requirements placed in CSA and AWS specifications for SAW filler metals?
A
They ensure that the electrode wire will feed smoothly to the weld zone
20
Q
What diameters are SAW electrode wires available in?
a) 1/16” - 1/4”
b) 3/32” - 3/8”
c) 1/8” - 1/2”
d) 5/32” - 3/4”
A
a) 1/16” - 1/4”
21
Q
What is the main difference between the CSA and AWS classification system
a) CSA uses the imperial system to measure tensile strength values
b) AWS uses the metric system to measure tensile strength values
c) CSA uses the metric system to measure tensile strength values
d) AWS uses yield strength values, while the CSA uses tensile strength values in their classification system,
A
c) CSA uses the metric system to measure tensile strength values
22
Q
Interpret the AWS classification for
F7AZ-EL12K
a) F
b) 7
c) A
d) Z
e) E
f) L
g) 12
h) K
A
F7AZ-EL12K
a) F - flux
b) 7 - min tensile strength of 70,000 psi
c) A - as welded condition
d) Z - no impact properties specified
e) E - electrode
f) L - low Mg content
g) 12 - nominal carbon content (0.12%)
h) K - made from full killed steel
23
Q
Interpret the CSA classification for the F49AZ- EM14K flux wire designation
a) F
b) 49
c) A
d)Z
e) E
f) M
g)14
h) K
A
F49AZ-EM14K
a) F - flux
b) 49 - min tensile strength of 490 mPa
c) A - as welded condition
d) Z - no impact properties specified
e) E - electrode
f) M - medium Mg content
g)14 - nominal carbon content ( 0.14%)
h) K - made from fully killed steel
24
Q
Which type of flux can be re-used?
a) bonded
b) agglomerated
c) fused
d) rutile- based
A
c) fused
25
Which type of SAW flux is generally used for the addition of alloying elements?
a) active flux
b) fused flux
c) recycled flux
d) neutral flux
a) active flux
26
What should be done with SAW fluxes after they have become exposed to moisture?
a) they should be discarded
b) they should be dried or rebaked according to manufacturer specifications
c) they should only be used for non critical welds
d) they should be used at 35 arc volts or higher to allow moisture and gasses to escape the weld before solidification
b) they should be dried or rebaked according to manufacturer specifications
27
Name 4 processes related causes of an unstable arc
Any of the 4 following are correct
1. joint dirty with scale or rust
2. incorrect electrical stickout
3. insufficient flux coverage
4. to much wire cast or helix causing poor wire feed
5. worn contact tube
6. incorrect voltage/ amperage settings
28
Name 3 things you should check for when the wire feed motor operates but the wire fails to feed
1. insufficient drive roll pressure
2. incorrect drive rolls
3. excessive pressure on wire spool brake
4. drive rolls are dirty or clogged
5. blockage in the liner or torch
6. plugged wire guide tubes
29
Are higher deposition rates obtainable with the SAW process
Yes
30
Is SAW easily done in all positions?
No
31
Is SAW the only wire process to use AC current?
Yes, MCAW, FCAW, GMAW all use DC only
32
What does SAW stand for ?
Submerged Arc Welding
33
SAW used what type of flux?
a) flux fused to the consumable electrode
b) granular flux
c) paste
d) SAW doesn't require flux
b) granular flux
34
Why was SAW so readily adopted in the industry?
a) high penetration capabilities
b) high deposition rates
c) high production rates
d) portability
c) high production rates
35
The use of flux with SAW is limited to flat and horizontal
T / F
True
36
What is another name for SAW?
Sub Arc
37
Is the following statement true or false?
SAW fuses metal with an electric current established between continuously fed bare metal consumable electrode(s). Shielding is provided by a granular fusible flux material usually brought to the work area with a flux feed system.
True
38
SAW flux must be carefully selected because it can influence:
a) arc stability
b) mechanical and chemical properties of weld deposit
c) the presence of structural discontinuities and impurities of the weld zone
d) all of the above
d) all of the above
39
The saw process is capable of making welds using currents of up to ______ amps ac or dc. Both currents can be used on the weld at the same time.
a) 1000 amps
b) 1500 amps
c) 2000 amps
d) 2500 amps
a) 1000 amps
40
SAW can use what type of filler metals:
a) single wires
b) multiple wires at once
c) strips of filler metal
d) all of the above
d) all of the above
41
What is SAW meant for
a) thin metals & vertical welds
b) thin metals & flat or horizontal positions
c) thick metals & flat or horizontal position
d) this metals in all positions
c) thick metals & flat or horizontal position
42
Can SAW weld joints?
Yes but there must be enough room for the welding head to have full access to the joint.
43
Factors to consider when choosing whether to use SAW or not.
Thickness of parent metal
joint accessibility
position of weld needed
volume or frequency of welding to be performed
mechanical requirements of the final weld
Chemical composition of the final weld needed
44
How can a SAW system be used
a) manual
b) manual & semi automatic
c) semi automatic and fully automatic
d) manually adjusted, semi automatic and fully automatic
d) manually adjusted, semi automatic and fully automatic
45
What equipment is specialized and specific to SAW
a supply of granular flux
flux feed and recovery equip
46
What currents is SAW compatible with?
a) CC
b) CV
c) DC
d) both a & b
d) both a & b
47
Explain why with SAW you would use the following
DCRP
DCSP
DCRP (DCEP) - direct current reverse polarity ( +) - max penetration
DCSP (DCEN) - direct current straight polarity (-) - max deposition
- also used to control arc blow
48
What does SAW use to move along the weld zone?
a) tracks
b) travel carriage
c) rollers
d) SAW can only weld 1 section at a time before the operator moves the equipment
b) travel carriage
49
What modes is SAW generally used?
a) machine, automatic
b) machine, semi automatic
c) machine only
d) semi automatic only
b) machine, semi automatic
50
Is using positioners and fixtures often used with tilting / rotating positioners?
Yes as they are on speed trunnion type rolls those positioners enable the welder to be in the correct position
51
Flux feed systems are available as a gravity fed system, or as a pressurized pneumatic flux feed system on fully automatic system True or False
True
52
What is typically used as a flux recovery unit?
vacuum
53
What is used to keep flux in a useable state?
a) a heater system to keep the recovered flux dry
b) screens to remove slag or other impurities
c) magnets to remove metalic impurities
d) all of the above
d) all of the above
54
What type of work lead is recommended for SAW
Screw type work lead
55
The CV machine with a constant feed speed wire drive unit is recommended for small diameter wire electrodes 5/64" - 1/8" because :
a) fast response time is required for stable arc
b) fast response time is needed to start the arc
c) fast response needed to push the arc to the base metal
a) fast response time is required for stable arc
56
A CC machine coupled to a voltage sensing wire feeder has a very stable arc when using ________ diameter wire electrodes and larger.
a) 5/16
b) 5/32
c) 3/16
d) 5/16
b) 5/32
CC used for large wire
CV used for small wire
57
When multiple wires are fed into the weld zone _______ can become a problem when using DC current.
a) arc hunting
b) arc blow
c) slag fusion to electrode
d) voltage hunting
b) arc blow
58
What duty cycle are most SAW power sources?
100% duty cycle as SAW is generally a high current process
59
What are 3 things you must consider when choosing a power source for SAW?
- rated output
- duty cycle rating
- primary power compatibility with the input power requirements of the welding power source
60
What are 5 welding head assembly components
Any of the following are correct
- controll unit
- variable speed electric motor and gear box
- wire straightener
- drive roll assembly
- a torch assembly
- wire feed setups
- flux feed and recovery systems
61
Wire straightener is designed to take some of the _____ our of the wire before it enters the drive roll assembly.
A) cast
b) helix
c) protective coating
d) none of the above it just adds an extra point for the wire to go through so it stays straight going into the main unit.
a) cast
62
Since SAW can use both CC & CV power sources what type of wire feeders are used ?
a) constant speed wire feeder
b) voltage sensing vire feeder
c) amperage sensing wire feeder
d) constant speed wire feeder and voltage sensing wire feeder
d) constant speed wire feeder and voltage sensing wire feeder
63
A flux recovery unit is a large vacuum that picks up unused flux from the weld seam as the SAW weld progresses
True or False
True
64
What is the most influential SAW variable due it controlling the penetration and burn off rate of the electrode
a) voltage
b) amperage
c) ESO
d) flux type
a) voltage
65
On CV power sources with a constant speed wire drive, the _________ has a direct relation to output amperage
a) wire speed
b) voltage
c) slope
d) inductance
a) Wire speed
66
A CV power source automatically adjusts the wire speed when the _________is adjusted.
a) voltage
b) wire speed
c) amperage
d) both b& C
d) both b& C
wire speed & amperage
67
Most CC power sources feature a single current control that sets the amperage by the wire feed
True or False
True
68
_________ directly affects the penetration and weld bead profile at a given voltage.
a) voltage
b) amperage / travel speed
c) inductance
d) ESO
b) amperage / travel speed
69
As a general rule, a good starting point for SAW is an ESO of ___ the diameter of the electrode.
a) 4X
b) 6X
c) 8X
d) 10X
c) 8X
70
The width and depth of the ______ influences arc action, bead appearance and weld metal soundness
a) weave pass
b) ESO
c) flux layer
d) none of the above
c) flux layer
71
If the flux layer is too deep, the arc is too restricted which results in
a) concave weld
b) overly convex weld bead
c) rough looking weld and ropy bead appearance
d) smooth weld with lots of cold lap
c) rough looking weld and ropy bead appearance
72
If the flux layer is to shallow, the arc will only be partially submerged which results in flashing and sputtering and may lead to _____ due to lack of gas coverage
a) arc hunting
b) arc blow
c) porosity
d) ropy appearance
c) porosity
73
As a general rule the appropriate depth of flux is reached:
a) 10x the width of the electrode
b) 15x the width of the electrode
c) once the weld coverage appears good
d) once the welding arc is fully submerged with no flashing
d) once the welding arc is fully submerged with no flashing
74
DC electrons flows in one direction only
a) positive to negative
b) negative to positive
b) negative to positive
75
When using SAW 2/3 of the arc energy is associated with the ______ side of the welding circuit.
a) positive
b) negative
c) neutral
d) the percentage is 50/50 positive and negative
b) negative
76
Are all of the following statements True or False
DCEP is generally used with SAW
- 2/3 of the energy is with the base metal
- the electrode burns off somewhat cooler
- narrow metal flow is quite general unless the arc is lengthened
- deeper penetration
Yes, all of these statements are correct
DCEP is generally used with SAW
- 2/3 of the energy is with the base metal
- the electrode burns off somewhat cooler
- narrow metal flow is quite general unless the arc is lengthened
- deeper penetration
77
Are all of the following statements True or False
DCEN is sometimes used with SAW when shallower penetration is desired
- 2/3 of the arc energy is in the electrode
- the electrode burns off hotter
- wider metal flow is noticed
- penetration is shallower
Yes, all of these statements are correct
DCEN is sometimes used with SAW when shallower penetration is desired
- 2/3 of the arc energy is in the electrode
- the electrode burns off hotter
- wider metal flow is noticed
- penetration is shallower
78
True or False
Active Flux - flux that is largely dependant on the welding variables
Neutral Flux - flux that will not cause significant change in the weld metals chemical composition when there is a large change in arc voltage
* Neutral flux is reusable
True
79
Do filler metals for SAW need to be manufacture to match each base metal, or can you purchase filler metals that will work with a variety of base metals
SAW needs its filler metals manufacturered for each specific base metal
80
SAW electrodes are available in
a) bare solid wire
b) composite metal cored
c) stranded electrodes
d) all of the above
d) all of the above
81
Which section of the CSA standard would you find SAW electrode information
a) W48-14
b) W48-16
c) W48-18
d) W48-20
a) W48-14
82
Saw flux and electrode are identified together. The AWS and CSA systems identify the _____ in the first part of the classification followed by the _____.
a) electrode, flux
b) flux, electrode
c) base metal, electrode
d) electrode, base metal
b) flux, electrode
83
Interpret the AWS specification of F7A3-EL12K
F -
7 -
A -
3 -
E -
L -
12 -
K -
F - Flux
7 - 70,000psi min tensile strength
A - as welded
3 - 30°F
E - Electrode
L - "Low" manganese content
12 - 0.12% carbon content
K - killed steel
84
Interpret the AWS specification of F49P4-EM12K
F -
49 -
P -
4 -
E -
M -
12 -
K -
F - flux
49 - 49,000psi min tensile strength
P - post weld heat treated
4 - -40°F
E - electrode
M - medium manganese content
12 - 0.12% carbon content
K - killed steel
85
Interpret the AWS specification of F7A3-EH12K
F -
7 -
A -
3 -
E -
H -
12 -
K -
F - Flux
7 - 70,000 psi min tensile strength
A - as welded
3 - -30°F
E - electrode
H - high manganese content
12 - 0.12% carbon content
K - killed steel
86
Interpret the AWS specification of F7P4-EC1
F -
7 -
P -
4 -
E -
C -
1 -
Interpret the AWS specification of F7P4-EC1
F - flux
7 - 70,000psi min tensile strength
P - post weld heat treatment
4 - -40°F
E - electrode
C - composite
1 - specified chemistry
87
True or False
SAW flux is classified in 2 distinct ways
1. keyed to its manufacture
2. relative to its effect on the alloy content of the weld deposit
True
88
Submerged arc welding fluxes that have 2 categories
a) neutral, reactive
b) bonded , neutral
c) fused, bonded
d) fused, neutral
c) fused, bonded
89
Fused fluxes are manufactured by combining a mixture of silica sand, metal oxides and a small amount of halide salt.
how are these components combined?
In a electric furnace to form metallic silicate glass
90
Fused fluxes typically _____ ferrous alloys or deoxidizers & are not likely to change drastically from their original chemistry and can be _____ for welding
a) do not contain, recycled
b) do contain, recycled
c) do contain, reused
d) do not contain, reused
d) do not contain, reused
91
Classifying fluxes based on their ability to change the alloy content of the weld deposits. The 3 types of fluxes according to this classification method are?
a) neutral, deactivated, wrought
b) neutral, active, alloy
c) negative, active, wrought
d) neutral, deactivated, alloy
b) neutral, active, alloy
92
______ do not significantly change the weld metal chemical analysis.
_______ contain deoxidizers to improve resistance to porosity and weld cracking
_______ generally contain enough alloy metal in their composition to produce an alloy weld using a carbon steel electrode
Neutral flux : do not significantly change the weld metal chemical analysis.
Active flux: contain deoxidizers to improve resistance to porosity and weld cracking
Alloy Flux: generally contain enough alloy metal in their composition to produce an alloy weld using a carbon steel electrode
93
When using an active flux the transfer of _____ & _____ is proportional to the arc voltage and the amount of flux used
a) magnesium, silicone
b) manganese, silicon
c) zinc, magnesium
d) zinc silicon
b) manganese, silicon
94
Tight control of the voltage is critical to maintain desired weld metal composition especially for ______ welds.
a) single
b) multi pass
c) stringer
d) cap
b) multi pass
Active Flux is generally used for single pass welds as the flux is generally not reusable
95
Alloy fluxes generally contain enough ______ in their composition to produce an alloy weld using carbon steel electrode.
a) alloy metal
b) wrought
c) manganese
d) silicates
a) alloy metal
96
Some flux hoppers are ______ to keep the flux dry
heated
97
Troubleshooting SAW Equipment. Issues fall into 1 of 3 categories.
Process, Electrical, Mechanical.
For each of the below issues state which category it falls under.
Unstable arc - incorrect ESO - incorrect flux coverage - worn contact tube - incorrect volt/amp settings
Stubbing - excessing WFS - arc voltage to low - insufficient flux coverage
Wire hang up - wire straightener needs adjusted
Wire feeds but no arc - poor ground connection - loose cable connections
Process, Electrical, Mechanical.
For each of the below issues state which category it falls under.
PROCESS - Unstable arc - incorrect ESO - incorrect flux coverage - worn contact tube - incorrect volt/amp settings
PROCESS - Stubbing - excessing WFS - arc voltage to low - insufficient flux coverage
MECHANICAL - Wire hang up - wire straightener needs adjusted
ELECTRICAL - Wire feeds but no arc - poor ground connection - loose cable connections
98
When comparing SAW to SMAW, GMAW, FCAW, MCAW, SAW Which of the following statements are an advantage to SAW and which are a disadvantage to SAW.
1. SAW is largely restricted to flat and horizontal
2. used on 3/16 or thicker unless backing is provided
3. Joints can be prepared with shallower and narrower V-groove - less filler metal used
4. high speeds and deposition rates possible
5. Flux can be used to supply alloying elements to the weld
6. welding parameters must be precisely controlled
7. low hydrogen- quality weld metal can be deposited
8. high quality welds are obtained for many critical applications and tested by x-ray
9. deviations in arc voltage can cause changes in weld composition when using the flux as an alloy source
10. operations require special training
11. multiple wire setups are possible for very heavy welds
1. disadvantage
2. disadvantage
3. advantage
4. advantage
5. advantage
6. disadvantage
7. advantage
8. advantage
9. disadvantage
10. disadvantage
11. advantage
99
When selecting a power source for SAW you should consider which factors? (9)
* cost and efficiency
* color and size
* brand name and service provider
*rated amperage, duty cycle, input power
*rated amperage, duty cycle, input power
100
Submerged Arc Welding uses what type of filler metal? (2)
a flux coated electrode
a flux filled electrode wire
a bare consumable electrode
a filler metal with slight radioactive properties
a bare consumable electrode
101
When referencing SAW flux and wire combination F49P2-EH12K, the K indicates: (25)
multi-pass welds
killed steel
contains molybdenum
magnesium used as a deoxidizer
killed steel
102
Why is AC power sometimes used, when multiple wires used to perform a weld? (9)
*to reduce arc blow
* to increase mechanical properties of the weld
* to reduce the amount of flux required
* to maximize amperage potential
*to reduce arc blow
103
The method of manufacturing fluxes is classified by two categories. Choose the correct answer. (28)
fused and unfused
fused and bonded
oxidized and de-oxidized
granular and paste
fused and bonded
104
One disadvantage of the submerged arc welding process is it: (37)
is limited to thicknesses that can be welded
is limited to flat and horizontal positions requires a costly shielding gas
can only be done underwater
is limited to flat and horizontal
105
Bonded fluxes may be reused: (28)
True
False
False
106
Active fluxes contain? (29)
* extra iron powder
* no deoxidizers
* deoxidizers
* Scavengers
* deoxidizers
107
When performing SAW with an active or alloy flux, why must the arc voltage be closely monitored and controlled? (29)
to eliminate preheat
to control the travel speed to reduce the affects of arc blow
to maintain the desired weld metal composition
to maintain the desired weld metal composition
108
Which of the following would cause an unstable arc when performing the SAW process? (33)
worn contact tube
too much cast in the wire
insufficient flux coverage
all of the above
all of the above
109
The acronym SAW stands for: (2)
* Straight Arc Welding
* Submerged Arc Welding
* Swift Arc Welding
* Standard Arc Welding
* Submerged Arc Welding
110
When using SAW, the welding head assembly requires which components to function? (5)
filler wire, wire feed motor, feed roll, wire straightener, torch
feed rolls, flux recovery, and power source
power source, contact tip, and spooled wire
wire feed rolls, gas flowmeter, and a nozzle
filler wire, wire feed motor, feed roll, wire straightener, torch
111
Which of the following is the correct statement regarding the proper depth of flux to be used for the SAW process? (17)
when depth of flux is 12 times the width of the bead desired
when the arc is fully submerged with no flashing
when the arc can be seen by the welder
depth of flux has no effect on the weld
when the arc is fully submerged with no flashing
112
Submerged arc welding has an advantage when: (36)
welding is done under water
continuous welding is done in the overhead position
high quality welds with high speeds and high deposition rate are required
the job cannot be positioned for roll welding
high quality welds with high speeds and high deposition rate are required
113
What method is used to provide shielding from the atmosphere when performing the SAW process? (2)
a flux filled wire
an externally applied gas
a granular flux around the arc
flux coating on the wire provides shielding
a granular flux around the arc
114
When choosing SAW consumables: (27)
the flux must be balanced with the chemical composition of the electrode
the required mechanical properties must be obtainable
the flux must meet the criteria for additional alloys
all of the above
all of the above
115
When performing SAW, excessive wire speed, arc voltage set to low, or insufficient flux coverage could:
* cause stubbing
* cause burn-back
* require an increased travel speed to compensate
* require special wire to reduce the effects of these deficiencies
cause stubbing
116
Why might a flux hopper be heated? (31)
to ensure the flux remains dry
to improve welding efficiency
to preheat the flux prior to welding
to maintain fusion properties of the flux
to ensure the flux remains dry
117
What power source is recommended for small diameter wire (5/64 to 1/8-inch)? (8)
OAC
OCC-DCEP
CC with a voltage-sensing wire feeder
CV with constant feed speed wire drive
CV with constant feed speed wire drive
118
According to CSA designation F49P2-EM12K SAW flux and wire combination, what does M indicate? (25)
* multi-pass welds
* contains molybdenum
*medium manganese content
* magnesium used as a deoxidizer
*medium manganese content
119
Voltage has a major effect on the shape of a bead produced during the SAW process. An increase in voltage would establish what type of bead shape? (16)
a high crowned bead
a concave bead
wider flatter bead
a narrow ropy bead
wider flatter bead
120
The electrode extension for SAW should be _
_times the electrode diameter? (17)
2
4
6
8
8
121
What type of system is generally used to recover the unused flux in the SAW process? (14)
* vacuum system
* magnetic system
* screening system
* gravity feed system
* vacuum system
122
According to the AWS flux and wire classification F7A3-EL12K what does the 12 define? (25)
* 12 percent carbon content of the wire
* 1.2 percent carbon content of the wire
* 0.12 percent carbon content of the wire
* 0.012 percent carbon content of the wire
* 0.12 percent carbon content of the wire
123
The power source for SAW may be of which type? (4)
AC
CVorCC
DCEN or DCEP
all of the above
all of the above
124
Why is a wire straightener required with SAW wire-feeders? (10)
to work harden the wire prior to welding, increasing mechanical properties
to reduce cast, and improve arc stability
to improve electrical conductivity
to reduce the effects of arc blow
to reduce cast, and improve arc stability
125
Fused fluxes may be reused. (28)
True
False
True
126
Which of the following flux feed systems are used to provide flux at the weld zone? (6)
gravity and pressurized
gravity vacuum
vacuum and pressurized
pressurized and return
gravity and pressurized
127
Which of the following could be classified as maintenance operations on SAW equipment? (32)
lubricate the travel carriage
check the work lead connections
apply spool covers
all of the above
all of the above
128
Which of the following variables would be the most influential in controlling penetration with the SAW process? (16)
depth of flux
electrode extension
amperage
voltage
amperage
