CWB LEVEL 2 ALL MODULES EXAM
QUESTIONS WITH DETAILED
ANSWERS 2026
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 - ANSWERS(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 - ANSWERS(B) dark
What is the Canadian Standard for safety in welding? - ANSWERSCSA W117.2
What is the typical three-phase input voltage in most Canadian welding shops? -
ANSWERS600V
True or False: The cable from the workpiece back to the welding machine is called the
"ground lead". - ANSWERSFalse. The correct term is the "work lead".
What is the type of radiation that can damage living cells? - ANSWERSIonizing
Name two examples of ionizing radiation. - ANSWERSX-rays and Gamma rays
What is the minimum suggested shade for a welding helmet when using 5/32 SMAW
electrode at 150 A? - ANSWERSShade 10
Approx. how far could spatter travel when welding/cutting from 2.5m high? -
ANSWERSPossibly up to 6m
What is the toxic component contained in some copper alloys? - ANSWERSBeryllium
,Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW] - ANSWERSFCAW
What do the terms TLV and TWA stand for? - ANSWERSTLV: Threshold limit value
TWA: Time weighted average
The action of UV light on oxygen produces which toxic gas? - ANSWERSOzone
Which common fuel gas has the widest range where it can become flammable when
mixed with air? - ANSWERSAcetylene
What substance should you NEVER apply to a stiff pressure-adjusting screw on an
oxygen regulator? - ANSWERSOil or grease
What is the maximum gauge pressure that acetylene should be used? (kPa/psi) -
ANSWERS103 kPa (15 psi)
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon
solvents? - ANSWERSPhosgene gas
What is the typical max. OCV of an AC welding machine? - ANSWERS80 V
In an isometric drawing, the lines (for width, length and depth) are inclined at an angle
of how many degrees? - ANSWERS30°
What are the maximum number of views in an orthographic drawing? - ANSWERS6
What are the two general classes of picture drawings? - ANSWERSPerspective and
Isometric
What are the 5 basic joints? - ANSWERS1) Butt
2) Corner
3) T
4) Lap
5) Edge
What are the 5 basic weld types? - ANSWERS1) Groove
2) Fillet
3) Plug/Slot
4) Surfacing
5) Edge
Plasma cutting torch temp can reach temperatures of __________ ° Celsius. -
ANSWERS30,000
,True or False: All plasma arc cutting equipment is operated using DCEN. -
ANSWERSTrue
True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. -
ANSWERSFalse
What are the two basic methods of plasma torch operation? - ANSWERSTransferred
and Non-Transferred arc
In North America, the 3 othographic views most commonly-used are: TOP, FRONT and
__________ Side.
[RIGHT / LEFT] - ANSWERSLEFT
What is the difference between a "weld symbol" and a "welding symbol"? - ANSWERSA
"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? - ANSWERSLEFT
In a welding symbol, is the length of the weld located to the LEFT or RIGHT of the fillet
weld symbol? - ANSWERSRIGHT
In what direction do the electrons flow in an electrical arc?
(A) anode --> cathode
(B) cathode --> anode - ANSWERS(B) cathode --> anode
In arc welding, the arc temperature can exceed temperatures of __________ ° Celsius?
- ANSWERS30,000
Which welding process has the highest arc efficiency? - ANSWERSSAW
Arc voltage __________ when arc length is increased.
[Increased / Decreased] - ANSWERSIncreases
In GTAW, what type of penetration and weld width can be expected when using DCEP?
- ANSWERSShallow penetration, and wide weld
Which polarity is most often chosen for direct current GTAW welding of steels and why?
- ANSWERSDCEN. More heat concentrated at the workpiece --> deeper penetration
Does SMAW use CC or CV? - ANSWERSCC
, For out-of-position welding, would you select a small or large diameter electrode? -
ANSWERSA small diameter electrode
Does GMAW use CC or CV? - ANSWERSCV
What happens to the SAW weld when you switch from DCEP to DCEN? -
ANSWERSIncreased deposition rate, but less penetration
What is the temperature for storing low-hydrogen electrodes? - ANSWERS120° Celsius
When using a consumable electrode in DCEN, the majority of the heat is concentrated
on the __________.
(A) Electrode
(B) Workpiece - ANSWERS(A) Electrode
When using a non-consumable electrode in DCEN, the majority of the heat is
concentrated on the __________.
(A) Electrode
(B) Workpiece - ANSWERS(B) Workpiece
Which has a "drooping" curve characteristic - CC or CV? - ANSWERSCC
AC transformer welding power sources use a:
(A) step-up transformer
(B) step-down transformer - ANSWERS(B) Step-down transformer
What is a diode used for in a welding machine?
(A) To produce AC current
(B) To produce DC current - ANSWERS(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% - ANSWERS(C) 60%
What current/polarity is used when welding aluminum with GTAW?
(A) DCEN
(B) DCEP
QUESTIONS WITH DETAILED
ANSWERS 2026
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 - ANSWERS(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 - ANSWERS(B) dark
What is the Canadian Standard for safety in welding? - ANSWERSCSA W117.2
What is the typical three-phase input voltage in most Canadian welding shops? -
ANSWERS600V
True or False: The cable from the workpiece back to the welding machine is called the
"ground lead". - ANSWERSFalse. The correct term is the "work lead".
What is the type of radiation that can damage living cells? - ANSWERSIonizing
Name two examples of ionizing radiation. - ANSWERSX-rays and Gamma rays
What is the minimum suggested shade for a welding helmet when using 5/32 SMAW
electrode at 150 A? - ANSWERSShade 10
Approx. how far could spatter travel when welding/cutting from 2.5m high? -
ANSWERSPossibly up to 6m
What is the toxic component contained in some copper alloys? - ANSWERSBeryllium
,Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW] - ANSWERSFCAW
What do the terms TLV and TWA stand for? - ANSWERSTLV: Threshold limit value
TWA: Time weighted average
The action of UV light on oxygen produces which toxic gas? - ANSWERSOzone
Which common fuel gas has the widest range where it can become flammable when
mixed with air? - ANSWERSAcetylene
What substance should you NEVER apply to a stiff pressure-adjusting screw on an
oxygen regulator? - ANSWERSOil or grease
What is the maximum gauge pressure that acetylene should be used? (kPa/psi) -
ANSWERS103 kPa (15 psi)
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon
solvents? - ANSWERSPhosgene gas
What is the typical max. OCV of an AC welding machine? - ANSWERS80 V
In an isometric drawing, the lines (for width, length and depth) are inclined at an angle
of how many degrees? - ANSWERS30°
What are the maximum number of views in an orthographic drawing? - ANSWERS6
What are the two general classes of picture drawings? - ANSWERSPerspective and
Isometric
What are the 5 basic joints? - ANSWERS1) Butt
2) Corner
3) T
4) Lap
5) Edge
What are the 5 basic weld types? - ANSWERS1) Groove
2) Fillet
3) Plug/Slot
4) Surfacing
5) Edge
Plasma cutting torch temp can reach temperatures of __________ ° Celsius. -
ANSWERS30,000
,True or False: All plasma arc cutting equipment is operated using DCEN. -
ANSWERSTrue
True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. -
ANSWERSFalse
What are the two basic methods of plasma torch operation? - ANSWERSTransferred
and Non-Transferred arc
In North America, the 3 othographic views most commonly-used are: TOP, FRONT and
__________ Side.
[RIGHT / LEFT] - ANSWERSLEFT
What is the difference between a "weld symbol" and a "welding symbol"? - ANSWERSA
"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? - ANSWERSLEFT
In a welding symbol, is the length of the weld located to the LEFT or RIGHT of the fillet
weld symbol? - ANSWERSRIGHT
In what direction do the electrons flow in an electrical arc?
(A) anode --> cathode
(B) cathode --> anode - ANSWERS(B) cathode --> anode
In arc welding, the arc temperature can exceed temperatures of __________ ° Celsius?
- ANSWERS30,000
Which welding process has the highest arc efficiency? - ANSWERSSAW
Arc voltage __________ when arc length is increased.
[Increased / Decreased] - ANSWERSIncreases
In GTAW, what type of penetration and weld width can be expected when using DCEP?
- ANSWERSShallow penetration, and wide weld
Which polarity is most often chosen for direct current GTAW welding of steels and why?
- ANSWERSDCEN. More heat concentrated at the workpiece --> deeper penetration
Does SMAW use CC or CV? - ANSWERSCC
, For out-of-position welding, would you select a small or large diameter electrode? -
ANSWERSA small diameter electrode
Does GMAW use CC or CV? - ANSWERSCV
What happens to the SAW weld when you switch from DCEP to DCEN? -
ANSWERSIncreased deposition rate, but less penetration
What is the temperature for storing low-hydrogen electrodes? - ANSWERS120° Celsius
When using a consumable electrode in DCEN, the majority of the heat is concentrated
on the __________.
(A) Electrode
(B) Workpiece - ANSWERS(A) Electrode
When using a non-consumable electrode in DCEN, the majority of the heat is
concentrated on the __________.
(A) Electrode
(B) Workpiece - ANSWERS(B) Workpiece
Which has a "drooping" curve characteristic - CC or CV? - ANSWERSCC
AC transformer welding power sources use a:
(A) step-up transformer
(B) step-down transformer - ANSWERS(B) Step-down transformer
What is a diode used for in a welding machine?
(A) To produce AC current
(B) To produce DC current - ANSWERS(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% - ANSWERS(C) 60%
What current/polarity is used when welding aluminum with GTAW?
(A) DCEN
(B) DCEP
