CWB 2 Visual Weld Inspector Exam
QUESTIONS & ANSWERS(RATED A+)
A consumable electrode is: - ANSWERAN electrode which melts and provides metal
to fill the joint
The weld heat affected zone is: - ANSWERthe portion of the base metal adjacent to
the weld metal whose properties have been changed due to the heat of welding
When an arc is formed between two electrodes - ANSWERelectricity flows from
negative cathode to positive anode
The magnetic pinch force helps in the process of the detaching the molten metal
drops from the electrode tip. The magnetic force - ANSWERincreases as the square
of the current causing smaller and smaller droplets to be detached
Explosion welding - ANSWERis solid state process in which coalescence is
produced through high speed impacting of two or more materials by controlled
detonation
A typical application for thermite welding is - ANSWERjoining of rails
Welding without filler metal with GTAW process is referred to as -
ANSWERautogenous welding
A typical weld flaw associated with GTAW process is - ANSWERporosity
SMAW power sources typically have a volt-ampere curve that is - ANSWERdrooping
The electric current for welding must be transformed from - ANSWERHigh voltage,
low amperage to low voltage, high amperage
The major advantage of electron beam welding process is - ANSWERfull penetration
welds on thick material in one pass
The progress of welding with Electroslag welding process is - ANSWERVertical up
Once a box of E49XX low hydrogen electrodes has been opened the electrodes may
remain at ambient temperature for up to a maximum of - ANSWER4 hours
Shielded Metal ARC Welding (SMAW) process - ANSWERestablishes an arc
between the end of a covered electrode and the work piece.
The spray mode of metal transfer is achieved with - ANSWERhigh amperage, high
voltage and argon-rich shielding gas
,digital wire feeders - ANSWERhave feedback systems to maintain the preset wire
feed speed
wire designated by CSA standard W48 as an E491T-9MJ-H8 - ANSWERResults in
weld deposit with a maximum of 8 ml diffusible hydrogen per 100 g of weld metal
Self shield flux cored wires are - ANSWERbetter able to tolerate air currents
The AWS classes metal cored wire along with - ANSWERsolid wires
SAW Fluxes that significantly influence the composition of the weld metal through
slag/metal reactions are called - ANSWERactive
Resistance welding of aluminum - ANSWERCan be done but with greater difficulty
due to its low resistivity
The plasma arc welding process is similar to what other welding process in principles
of operation - ANSWERGTAW
For a flat weld profile and good penetration profile using the MCAW process -
ANSWER15 degree travel angle using push technique should be used
What is the effect of tip to work distance (electrical sickout on deposition rate of
submerged are welding - ANSWERdecreasing tip to work distance without adjusting
any other variable will cause a increase in deposition rate
Electrode stick out is measured - ANSWERFrom tip of nozzle to end of electrode
Contact tip-to-work is the sum (CTTW) - ANSWERof the electrode extension and arc
length
Increasing electrical sickout - ANSWERdecreases voltage, decreases current and
increases resistance
Which welding process for GMAW has large weld pool and is rather large and
difficult to control out of position - ANSWERSpray transfer
Which welding process for GMAW has excessive spatter - ANSWERGlobular
transfer
Which welding process for GMAW usually has lack of fusion - ANSWERShort Circuit
what electrodes never go in holding or baking oven - ANSWERcellulosic
Submerged Arc Welding disadvantage - ANSWERRequires inter-pass and post weld
slag removal
What welding process has the greatest HAZ - ANSWERElectroslag
GTAW when a BALL is formed on Tungsten - ANSWERAluminum
,Which welding process can be done outside Earth's atmosphere - ANSWERDiffusion
With tungsten arc, most of the current across the arc is carried by -
ANSWERelectrons
Electrode beam welding has - ANSWERa very narrow weld and heat affected zone
Which gases are used with the GMAW process - ANSWERargon and CO2 and their
mixtures in various proportions
Which welding process is non-consumable electrode process - ANSWERGTAW
Which shielding gas does GMAW use for spray transfer - ANSWER95% Argon and
5% CO2
The deposition rate of SMAW electrodes is increased by including - ANSWERIron
Power
Electrode in Flux cored are welding is - ANSWERTubular wire containing flux or
other ingredients
What welding process is not used in overhead position - ANSWERSAW (Submerged
Arc Welding
SAW Fluxes that significantly influence the composition of the weld metal through
slag/metal reactions are called - ANSWERare classified in conjunction with welding
wire forming a flux designation
A welding arc consists of a - ANSWERhigh current and low voltage
The heat of the welding arc is used to - ANSWERlocally melt the base material and
filler material to create fusion upon solidification
Welding using GTAW process with current set to DCEN - ANSWER30% arc heat at
the electrode and 70% arc heat at the work
The function of the ingredients in the electrode coating of SMAW electrodes is to -
ANSWERprovide a gas shield, slag covering, scavengers, arc stabilization and
additional alloying elements
The temperature for holding low hydrogen electrodes - ANSWER120 C
The GMAW process uses (Blank) to shield the molten weld from the atmosphere -
ANSWERexternal shielding gas
The flux cored arc welding is an arc welding process usually in the semi-automatic
mode, consisting of: - ANSWERA constant current power supply, a continuous
speed wire feeder, a welding gun, and a continuous filler metal electrode with a
hallow core containing flux and other ingredients
, Welding is process a joining process that by definition requires application of -
ANSWEREither heat or pressure
Name the two main methods of arc shielding - ANSWERflux shielding and gas
shielding
Which direction do the electrons flow in an electrical are - ANSWERCathode to
anode
In are welding, the electric are is intensely hot with temperature exceeding -
ANSWER30,000 C
How does the arc voltage and arc stiffness change when the arc length is increased
- ANSWERArc voltage increases and arc stiffness decreases
What type of penetration and weld width can be expected when using DC positive
(GTAW) - ANSWERShallow penetration and a wide weld
Which polarity is chosen most often for direct current GTAW welding of steels and
why - ANSWERDirect current electrode negative. More heat is produced at the work
piece leading to deeper weld penetration
Why must shielding gas for GTAW be completely inert - ANSWERPresence of active
gases like oxygen and carbon dioxide the tungsten electrode and the limit its life.
Two advantages of GTAW process - ANSWERIt gives high quality deposits, and the
process can be used to weld virtually all metals and alloys
Why is SMAW a very commonly used welding process - ANSWERIt provides great
flexibility in terms of the broad range of materials and their thicknesses that can be
joined in all welding positions
SMAW uses constant current or constant voltage - ANSWERconstant current
Why is care necessary in the proper storage and handling of electrodes for welding
steels - ANSWERImproperly stored electrodes can pick up moisture leading to
increased weld metal hydrogen content and therefore increased risk of cold cracking
in the weld zone
GMAW uses Constant Voltage or Constant Current - ANSWERConstant Voltage
Which metal transfer would be applied to Cast Iron - ANSWERGMAW: Short
Circuiting
Which metal transfer would be applied to aluminum alloy - ANSWERGMAW: Spray
Between 100% CO2 and 95% Ar-5% CO2, which shielding gas will you chose to
spray in semi-automatic welding of carbon steel - ANSWER95% Ar - 5% CO2
QUESTIONS & ANSWERS(RATED A+)
A consumable electrode is: - ANSWERAN electrode which melts and provides metal
to fill the joint
The weld heat affected zone is: - ANSWERthe portion of the base metal adjacent to
the weld metal whose properties have been changed due to the heat of welding
When an arc is formed between two electrodes - ANSWERelectricity flows from
negative cathode to positive anode
The magnetic pinch force helps in the process of the detaching the molten metal
drops from the electrode tip. The magnetic force - ANSWERincreases as the square
of the current causing smaller and smaller droplets to be detached
Explosion welding - ANSWERis solid state process in which coalescence is
produced through high speed impacting of two or more materials by controlled
detonation
A typical application for thermite welding is - ANSWERjoining of rails
Welding without filler metal with GTAW process is referred to as -
ANSWERautogenous welding
A typical weld flaw associated with GTAW process is - ANSWERporosity
SMAW power sources typically have a volt-ampere curve that is - ANSWERdrooping
The electric current for welding must be transformed from - ANSWERHigh voltage,
low amperage to low voltage, high amperage
The major advantage of electron beam welding process is - ANSWERfull penetration
welds on thick material in one pass
The progress of welding with Electroslag welding process is - ANSWERVertical up
Once a box of E49XX low hydrogen electrodes has been opened the electrodes may
remain at ambient temperature for up to a maximum of - ANSWER4 hours
Shielded Metal ARC Welding (SMAW) process - ANSWERestablishes an arc
between the end of a covered electrode and the work piece.
The spray mode of metal transfer is achieved with - ANSWERhigh amperage, high
voltage and argon-rich shielding gas
,digital wire feeders - ANSWERhave feedback systems to maintain the preset wire
feed speed
wire designated by CSA standard W48 as an E491T-9MJ-H8 - ANSWERResults in
weld deposit with a maximum of 8 ml diffusible hydrogen per 100 g of weld metal
Self shield flux cored wires are - ANSWERbetter able to tolerate air currents
The AWS classes metal cored wire along with - ANSWERsolid wires
SAW Fluxes that significantly influence the composition of the weld metal through
slag/metal reactions are called - ANSWERactive
Resistance welding of aluminum - ANSWERCan be done but with greater difficulty
due to its low resistivity
The plasma arc welding process is similar to what other welding process in principles
of operation - ANSWERGTAW
For a flat weld profile and good penetration profile using the MCAW process -
ANSWER15 degree travel angle using push technique should be used
What is the effect of tip to work distance (electrical sickout on deposition rate of
submerged are welding - ANSWERdecreasing tip to work distance without adjusting
any other variable will cause a increase in deposition rate
Electrode stick out is measured - ANSWERFrom tip of nozzle to end of electrode
Contact tip-to-work is the sum (CTTW) - ANSWERof the electrode extension and arc
length
Increasing electrical sickout - ANSWERdecreases voltage, decreases current and
increases resistance
Which welding process for GMAW has large weld pool and is rather large and
difficult to control out of position - ANSWERSpray transfer
Which welding process for GMAW has excessive spatter - ANSWERGlobular
transfer
Which welding process for GMAW usually has lack of fusion - ANSWERShort Circuit
what electrodes never go in holding or baking oven - ANSWERcellulosic
Submerged Arc Welding disadvantage - ANSWERRequires inter-pass and post weld
slag removal
What welding process has the greatest HAZ - ANSWERElectroslag
GTAW when a BALL is formed on Tungsten - ANSWERAluminum
,Which welding process can be done outside Earth's atmosphere - ANSWERDiffusion
With tungsten arc, most of the current across the arc is carried by -
ANSWERelectrons
Electrode beam welding has - ANSWERa very narrow weld and heat affected zone
Which gases are used with the GMAW process - ANSWERargon and CO2 and their
mixtures in various proportions
Which welding process is non-consumable electrode process - ANSWERGTAW
Which shielding gas does GMAW use for spray transfer - ANSWER95% Argon and
5% CO2
The deposition rate of SMAW electrodes is increased by including - ANSWERIron
Power
Electrode in Flux cored are welding is - ANSWERTubular wire containing flux or
other ingredients
What welding process is not used in overhead position - ANSWERSAW (Submerged
Arc Welding
SAW Fluxes that significantly influence the composition of the weld metal through
slag/metal reactions are called - ANSWERare classified in conjunction with welding
wire forming a flux designation
A welding arc consists of a - ANSWERhigh current and low voltage
The heat of the welding arc is used to - ANSWERlocally melt the base material and
filler material to create fusion upon solidification
Welding using GTAW process with current set to DCEN - ANSWER30% arc heat at
the electrode and 70% arc heat at the work
The function of the ingredients in the electrode coating of SMAW electrodes is to -
ANSWERprovide a gas shield, slag covering, scavengers, arc stabilization and
additional alloying elements
The temperature for holding low hydrogen electrodes - ANSWER120 C
The GMAW process uses (Blank) to shield the molten weld from the atmosphere -
ANSWERexternal shielding gas
The flux cored arc welding is an arc welding process usually in the semi-automatic
mode, consisting of: - ANSWERA constant current power supply, a continuous
speed wire feeder, a welding gun, and a continuous filler metal electrode with a
hallow core containing flux and other ingredients
, Welding is process a joining process that by definition requires application of -
ANSWEREither heat or pressure
Name the two main methods of arc shielding - ANSWERflux shielding and gas
shielding
Which direction do the electrons flow in an electrical are - ANSWERCathode to
anode
In are welding, the electric are is intensely hot with temperature exceeding -
ANSWER30,000 C
How does the arc voltage and arc stiffness change when the arc length is increased
- ANSWERArc voltage increases and arc stiffness decreases
What type of penetration and weld width can be expected when using DC positive
(GTAW) - ANSWERShallow penetration and a wide weld
Which polarity is chosen most often for direct current GTAW welding of steels and
why - ANSWERDirect current electrode negative. More heat is produced at the work
piece leading to deeper weld penetration
Why must shielding gas for GTAW be completely inert - ANSWERPresence of active
gases like oxygen and carbon dioxide the tungsten electrode and the limit its life.
Two advantages of GTAW process - ANSWERIt gives high quality deposits, and the
process can be used to weld virtually all metals and alloys
Why is SMAW a very commonly used welding process - ANSWERIt provides great
flexibility in terms of the broad range of materials and their thicknesses that can be
joined in all welding positions
SMAW uses constant current or constant voltage - ANSWERconstant current
Why is care necessary in the proper storage and handling of electrodes for welding
steels - ANSWERImproperly stored electrodes can pick up moisture leading to
increased weld metal hydrogen content and therefore increased risk of cold cracking
in the weld zone
GMAW uses Constant Voltage or Constant Current - ANSWERConstant Voltage
Which metal transfer would be applied to Cast Iron - ANSWERGMAW: Short
Circuiting
Which metal transfer would be applied to aluminum alloy - ANSWERGMAW: Spray
Between 100% CO2 and 95% Ar-5% CO2, which shielding gas will you chose to
spray in semi-automatic welding of carbon steel - ANSWER95% Ar - 5% CO2
