CWB Level II Questions and Complete
Detailed 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 - 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
Does SMAW use CC or CV? - Answer: CC
Detailed 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 - 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
Does SMAW use CC or CV? - Answer: CC
