CWB Level II Exam Questions &
Answers 100% Correct
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 - 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 - ANSWER-(B) dark
What is the Canadian Standard for safety in welding? - ANSWER-CSA W117.2
What is the typical three-phase input voltage in most Canadian welding shops? -
ANSWER-600V
True or False: The cable from the workpiece back to the welding machine is called the
"ground lead". - ANSWER-False. The correct term is the "work lead".
What is the type of radiation that can damage living cells? - ANSWER-Ionizing
Name two examples of ionizing radiation. - 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? - ANSWER-Shade 10
Approx. how far could spatter travel when welding/cutting from 2.5m high? - ANSWER-
Possibly up to 6m
What is the toxic component contained in some copper alloys? - ANSWER-Beryllium
,Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW] - ANSWER-FCAW
What do the terms TLV and TWA stand for? - ANSWER-TLV: Threshold limit value
TWA: Time weighted average
Is helium lighter or heavier than air? - ANSWER-Lighter
The action of UV light on oxygen produces which toxic gas? - ANSWER-Ozone
Which common fuel gas has the widest range where it can become flammable when
mixed with air? - ANSWER-Acetylene
What substance should you NEVER apply to a stiff pressure-adjusting screw on an
oxygen regulator? - ANSWER-Oil or grease
What is the maximum gauge pressure that acetylene should be used? (kPa/psi) -
ANSWER-103 kPa (15 psi)
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon
solvents? - ANSWER-Phosgene gas
What is the typical max. OCV of an AC welding machine? - ANSWER-80 V
In an isometric drawing, the lines (for width, length and depth) are inclined at an angle
of how many degrees? - ANSWER-30°
What are the maximum number of views in an orthographic drawing? - ANSWER-6
What are the two general classes of picture drawings? - ANSWER-Perspective and
Isometric
What are the 5 basic joints? - ANSWER-1) Butt
2) Corner
3) T
4) Lap
5) Edge
What are the 5 basic weld types? - ANSWER-1) Groove
2) Fillet
3) Plug/Slot
4) Surfacing
5) Edge
, Plasma cutting torch temp can reach temperatures of __________ ° Celsius. -
ANSWER-30,000
True or False: All plasma arc cutting equipment is operated using DCEN. - ANSWER-
True
True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. -
ANSWER-False
What are the two basic methods of plasma torch operation? - ANSWER-Transferred
and Non-Transferred arc
In North America, the 3 othographic views most commonly-used are: TOP, FRONT and
__________ Side.
[RIGHT / LEFT] - ANSWER-LEFT
What is the difference between a "weld symbol" and a "welding symbol"? - 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? - ANSWER-LEFT
In a welding symbol, is the length of the weld located to the LEFT or RIGHT of the fillet
weld symbol? - ANSWER-RIGHT
In what direction do the electrons flow in an electrical arc?
(A) anode --> cathode
(B) cathode --> anode - ANSWER-(B) cathode --> anode
In arc welding, the arc temperature can exceed temperatures of __________ ° Celsius?
- ANSWER-30,000
Which welding process has the highest arc efficiency? - ANSWER-SAW
Arc voltage __________ when arc length is increased.
[Increased / Decreased] - ANSWER-Increases
In GTAW, what type of penetration and weld width can be expected when using DCEP?
- ANSWER-Shallow penetration, and wide weld
Which polarity is most often chosen for direct current GTAW welding of steels and why?
- ANSWER-DCEN. More heat concentrated at the workpiece --> deeper penetration
Answers 100% Correct
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 - 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 - ANSWER-(B) dark
What is the Canadian Standard for safety in welding? - ANSWER-CSA W117.2
What is the typical three-phase input voltage in most Canadian welding shops? -
ANSWER-600V
True or False: The cable from the workpiece back to the welding machine is called the
"ground lead". - ANSWER-False. The correct term is the "work lead".
What is the type of radiation that can damage living cells? - ANSWER-Ionizing
Name two examples of ionizing radiation. - 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? - ANSWER-Shade 10
Approx. how far could spatter travel when welding/cutting from 2.5m high? - ANSWER-
Possibly up to 6m
What is the toxic component contained in some copper alloys? - ANSWER-Beryllium
,Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW] - ANSWER-FCAW
What do the terms TLV and TWA stand for? - ANSWER-TLV: Threshold limit value
TWA: Time weighted average
Is helium lighter or heavier than air? - ANSWER-Lighter
The action of UV light on oxygen produces which toxic gas? - ANSWER-Ozone
Which common fuel gas has the widest range where it can become flammable when
mixed with air? - ANSWER-Acetylene
What substance should you NEVER apply to a stiff pressure-adjusting screw on an
oxygen regulator? - ANSWER-Oil or grease
What is the maximum gauge pressure that acetylene should be used? (kPa/psi) -
ANSWER-103 kPa (15 psi)
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon
solvents? - ANSWER-Phosgene gas
What is the typical max. OCV of an AC welding machine? - ANSWER-80 V
In an isometric drawing, the lines (for width, length and depth) are inclined at an angle
of how many degrees? - ANSWER-30°
What are the maximum number of views in an orthographic drawing? - ANSWER-6
What are the two general classes of picture drawings? - ANSWER-Perspective and
Isometric
What are the 5 basic joints? - ANSWER-1) Butt
2) Corner
3) T
4) Lap
5) Edge
What are the 5 basic weld types? - ANSWER-1) Groove
2) Fillet
3) Plug/Slot
4) Surfacing
5) Edge
, Plasma cutting torch temp can reach temperatures of __________ ° Celsius. -
ANSWER-30,000
True or False: All plasma arc cutting equipment is operated using DCEN. - ANSWER-
True
True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. -
ANSWER-False
What are the two basic methods of plasma torch operation? - ANSWER-Transferred
and Non-Transferred arc
In North America, the 3 othographic views most commonly-used are: TOP, FRONT and
__________ Side.
[RIGHT / LEFT] - ANSWER-LEFT
What is the difference between a "weld symbol" and a "welding symbol"? - 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? - ANSWER-LEFT
In a welding symbol, is the length of the weld located to the LEFT or RIGHT of the fillet
weld symbol? - ANSWER-RIGHT
In what direction do the electrons flow in an electrical arc?
(A) anode --> cathode
(B) cathode --> anode - ANSWER-(B) cathode --> anode
In arc welding, the arc temperature can exceed temperatures of __________ ° Celsius?
- ANSWER-30,000
Which welding process has the highest arc efficiency? - ANSWER-SAW
Arc voltage __________ when arc length is increased.
[Increased / Decreased] - ANSWER-Increases
In GTAW, what type of penetration and weld width can be expected when using DCEP?
- ANSWER-Shallow penetration, and wide weld
Which polarity is most often chosen for direct current GTAW welding of steels and why?
- ANSWER-DCEN. More heat concentrated at the workpiece --> deeper penetration
