CWB Level II complete Questions with
simplified correct Answers
What is the term used to describe the following condition of lost corrosion resistance?
"When certain stainless steels are heated between 500-850° C, carbides form at the grain boundaries
and cause a local depletion of chromium."
(A) Oxidization
(B) Increased toughness
(C) Solution heat treatment
(D) Sensitization - correct answer-(D) Sensitization
Note: Also known as "carbide precipitation" -- Chromium binds to carbides, and "sweats out" at the grain
boundaries
On a radiograph, undercut appears as a _________ line.
(A) light
(B) dark - correct answer-(B) dark
What is the Canadian Standard for safety in welding? - correct answer-CSA W117.2
What is the typical three-phase input voltage in most Canadian welding shops? - correct answer-600V
True or False: The cable from the workpiece back to the welding machine is called the "ground lead". -
correct answer-False. The correct term is the "work lead".
What is the type of radiation that can damage living cells? - correct answer-Ionizing
Name two examples of ionizing radiation. - correct answer-X-rays and Gamma rays
What is the minimum suggested shade for a welding helmet when using 5/32 SMAW electrode at 150 A?
- correct answer-Shade 10
Approx. how far could spatter travel when welding/cutting from 2.5m high? - correct answer-Possibly up
to 6m
What is the toxic component contained in some copper alloys? - correct answer-Beryllium
Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW] - correct answer-FCAW
What do the terms TLV and TWA stand for? - correct answer-TLV: Threshold limit value
TWA: Time weighted average
Is helium lighter or heavier than air? - correct answer-Lighter
The action of UV light on oxygen produces which toxic gas? - correct answer-Ozone
Which common fuel gas has the widest range where it can become flammable when mixed with air? -
correct answer-Acetylene
What substance should you NEVER apply to a stiff pressure-adjusting screw on an oxygen regulator? -
correct answer-Oil or grease
What is the maximum gauge pressure that acetylene should be used? (kPa/psi) - correct answer-103 kPa
(15 psi)
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon solvents? - correct
answer-Phosgene gas
What is the typical max. OCV of an AC welding machine? - correct answer-80 V
,In an isometric drawing, the lines (for width, length and depth) are inclined at an angle of how many
degrees? - correct answer-30°
What are the maximum number of views in an orthographic drawing? - correct answer-6
What are the two general classes of picture drawings? - correct answer-Perspective and Isometric
What are the 5 basic joints? - correct answer-1) Butt
2) Corner
3) T
4) Lap
5) Edge
What are the 5 basic weld types? - correct answer-1) Groove
2) Fillet
3) Plug/Slot
4) Surfacing
5) Edge
Plasma cutting torch temp can reach temperatures of __________ ° Celsius. - correct answer-30,000
True or False: All plasma arc cutting equipment is operated using DCEN. - correct answer-True
True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. - correct answer-False
What are the two basic methods of plasma torch operation? - correct answer-Transferred and Non-
Transferred arc
In North America, the 3 othographic views most commonly-used are: TOP, FRONT and __________ Side.
[RIGHT / LEFT] - correct answer-LEFT
What is the difference between a "weld symbol" and a "welding symbol"? - correct answer-A "weld
symbol" indicates the specific kind of weld to be used (ex. fillet), and is contained inside of "welding
symbol".
In a welding symbol, is the size of the weld located to the LEFT or RIGHT of the fillet weld symbol? -
correct answer-LEFT
In a welding symbol, is the length of the weld located to the LEFT or RIGHT of the fillet weld symbol? -
correct answer-RIGHT
In what direction do the electrons flow in an electrical arc?
(A) anode --> cathode
(B) cathode --> anode - correct answer-(B) cathode --> anode
In arc welding, the arc temperature can exceed temperatures of __________ ° Celsius? - correct answer-
30,000
Which welding process has the highest arc efficiency? - correct answer-SAW
Arc voltage __________ when arc length is increased.
[Increased / Decreased] - correct answer-Increases
In GTAW, what type of penetration and weld width can be expected when using DCEP? - correct answer-
Shallow penetration, and wide weld
Which polarity is most often chosen for direct current GTAW welding of steels and why? - correct
answer-DCEN. More heat concentrated at the workpiece --> deeper penetration
Does SMAW use CC or CV? - correct answer-CC
For out-of-position welding, would you select a small or large diameter electrode? - correct answer-A
small diameter electrode
Does GMAW use CC or CV? - correct answer-CV
, What happens to the SAW weld when you switch from DCEP to DCEN? - correct answer-Increased
deposition rate, but less penetration
What is the temperature for storing low-hydrogen electrodes? - correct answer-120° Celsius
When using a consumable electrode in DCEN, the majority of the heat is concentrated on the
__________.
(A) Electrode
(B) Workpiece - correct answer-(A) Electrode
When using a non-consumable electrode in DCEN, the majority of the heat is concentrated on the
__________.
(A) Electrode
(B) Workpiece - correct answer-(B) Workpiece
Which has a "drooping" curve characteristic - CC or CV? - correct answer-CC
AC transformer welding power sources use a:
(A) step-up transformer
(B) step-down transformer - correct answer-(B) Step-down transformer
What is a diode used for in a welding machine?
(A) To produce AC current
(B) To produce DC current - correct answer-(B) To produce DC current
The typical duty cycle for a Class 1 industrial welding power source is:
(A) 20%
(B) 35%
(C) 60%
(D) 150% - correct answer-(C) 60%
What current/polarity is used when welding aluminum with GTAW?
(A) DCEN
(B) DCEP
(C) AC - correct answer-(C) AC
True or False: a welding cable size designation "No. 4" is larger than a "No. 2". - correct answer-False.
Cable sizes (smallest-to-largest) are:
4 - 3 - 2 - 1 - 1/0 - 2/0 - 3/0 - 4/0
To increase the melting rate (burn-off rate) of a SMAW electrode, which polarity would you use? -
correct answer-DCEN
Is it possible to operate a wire-feed welding process using constant current? - correct answer-Yes - but
you must use a voltage-sensing wire-feeder to obtain a self-regulating arc.
A transformer is a device that:
(A) transforms AC to DC
(B) transforms DC to AC
(C) changes the value of AC - correct answer-(C) changes the value of AC
A rectifier is a device that:
simplified correct Answers
What is the term used to describe the following condition of lost corrosion resistance?
"When certain stainless steels are heated between 500-850° C, carbides form at the grain boundaries
and cause a local depletion of chromium."
(A) Oxidization
(B) Increased toughness
(C) Solution heat treatment
(D) Sensitization - correct answer-(D) Sensitization
Note: Also known as "carbide precipitation" -- Chromium binds to carbides, and "sweats out" at the grain
boundaries
On a radiograph, undercut appears as a _________ line.
(A) light
(B) dark - correct answer-(B) dark
What is the Canadian Standard for safety in welding? - correct answer-CSA W117.2
What is the typical three-phase input voltage in most Canadian welding shops? - correct answer-600V
True or False: The cable from the workpiece back to the welding machine is called the "ground lead". -
correct answer-False. The correct term is the "work lead".
What is the type of radiation that can damage living cells? - correct answer-Ionizing
Name two examples of ionizing radiation. - correct answer-X-rays and Gamma rays
What is the minimum suggested shade for a welding helmet when using 5/32 SMAW electrode at 150 A?
- correct answer-Shade 10
Approx. how far could spatter travel when welding/cutting from 2.5m high? - correct answer-Possibly up
to 6m
What is the toxic component contained in some copper alloys? - correct answer-Beryllium
Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW] - correct answer-FCAW
What do the terms TLV and TWA stand for? - correct answer-TLV: Threshold limit value
TWA: Time weighted average
Is helium lighter or heavier than air? - correct answer-Lighter
The action of UV light on oxygen produces which toxic gas? - correct answer-Ozone
Which common fuel gas has the widest range where it can become flammable when mixed with air? -
correct answer-Acetylene
What substance should you NEVER apply to a stiff pressure-adjusting screw on an oxygen regulator? -
correct answer-Oil or grease
What is the maximum gauge pressure that acetylene should be used? (kPa/psi) - correct answer-103 kPa
(15 psi)
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon solvents? - correct
answer-Phosgene gas
What is the typical max. OCV of an AC welding machine? - correct answer-80 V
,In an isometric drawing, the lines (for width, length and depth) are inclined at an angle of how many
degrees? - correct answer-30°
What are the maximum number of views in an orthographic drawing? - correct answer-6
What are the two general classes of picture drawings? - correct answer-Perspective and Isometric
What are the 5 basic joints? - correct answer-1) Butt
2) Corner
3) T
4) Lap
5) Edge
What are the 5 basic weld types? - correct answer-1) Groove
2) Fillet
3) Plug/Slot
4) Surfacing
5) Edge
Plasma cutting torch temp can reach temperatures of __________ ° Celsius. - correct answer-30,000
True or False: All plasma arc cutting equipment is operated using DCEN. - correct answer-True
True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. - correct answer-False
What are the two basic methods of plasma torch operation? - correct answer-Transferred and Non-
Transferred arc
In North America, the 3 othographic views most commonly-used are: TOP, FRONT and __________ Side.
[RIGHT / LEFT] - correct answer-LEFT
What is the difference between a "weld symbol" and a "welding symbol"? - correct answer-A "weld
symbol" indicates the specific kind of weld to be used (ex. fillet), and is contained inside of "welding
symbol".
In a welding symbol, is the size of the weld located to the LEFT or RIGHT of the fillet weld symbol? -
correct answer-LEFT
In a welding symbol, is the length of the weld located to the LEFT or RIGHT of the fillet weld symbol? -
correct answer-RIGHT
In what direction do the electrons flow in an electrical arc?
(A) anode --> cathode
(B) cathode --> anode - correct answer-(B) cathode --> anode
In arc welding, the arc temperature can exceed temperatures of __________ ° Celsius? - correct answer-
30,000
Which welding process has the highest arc efficiency? - correct answer-SAW
Arc voltage __________ when arc length is increased.
[Increased / Decreased] - correct answer-Increases
In GTAW, what type of penetration and weld width can be expected when using DCEP? - correct answer-
Shallow penetration, and wide weld
Which polarity is most often chosen for direct current GTAW welding of steels and why? - correct
answer-DCEN. More heat concentrated at the workpiece --> deeper penetration
Does SMAW use CC or CV? - correct answer-CC
For out-of-position welding, would you select a small or large diameter electrode? - correct answer-A
small diameter electrode
Does GMAW use CC or CV? - correct answer-CV
, What happens to the SAW weld when you switch from DCEP to DCEN? - correct answer-Increased
deposition rate, but less penetration
What is the temperature for storing low-hydrogen electrodes? - correct answer-120° Celsius
When using a consumable electrode in DCEN, the majority of the heat is concentrated on the
__________.
(A) Electrode
(B) Workpiece - correct answer-(A) Electrode
When using a non-consumable electrode in DCEN, the majority of the heat is concentrated on the
__________.
(A) Electrode
(B) Workpiece - correct answer-(B) Workpiece
Which has a "drooping" curve characteristic - CC or CV? - correct answer-CC
AC transformer welding power sources use a:
(A) step-up transformer
(B) step-down transformer - correct answer-(B) Step-down transformer
What is a diode used for in a welding machine?
(A) To produce AC current
(B) To produce DC current - correct answer-(B) To produce DC current
The typical duty cycle for a Class 1 industrial welding power source is:
(A) 20%
(B) 35%
(C) 60%
(D) 150% - correct answer-(C) 60%
What current/polarity is used when welding aluminum with GTAW?
(A) DCEN
(B) DCEP
(C) AC - correct answer-(C) AC
True or False: a welding cable size designation "No. 4" is larger than a "No. 2". - correct answer-False.
Cable sizes (smallest-to-largest) are:
4 - 3 - 2 - 1 - 1/0 - 2/0 - 3/0 - 4/0
To increase the melting rate (burn-off rate) of a SMAW electrode, which polarity would you use? -
correct answer-DCEN
Is it possible to operate a wire-feed welding process using constant current? - correct answer-Yes - but
you must use a voltage-sensing wire-feeder to obtain a self-regulating arc.
A transformer is a device that:
(A) transforms AC to DC
(B) transforms DC to AC
(C) changes the value of AC - correct answer-(C) changes the value of AC
A rectifier is a device that:
