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CWB Level II Questions And Verified Answers
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CWB Level II Questions And Verified Answers2024-2025
What is the term for 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 common 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 proper term is the "work lead".
What type of radiation can damage living cells? - Answer Ionizing
,Name two examples of ionizing radiation. - Answer X-rays and Gamma rays
What minimum shade is suggested for a welding helmet for 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 toxic element can be present in some copper alloys? - Answer Beryllium
Which of the following joining processes would be expected to have the highest fume
generation rate?
[SMAW / SAW / FCAW] - Answer FCAW
What do the following abbreviations 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 of the following common fuel gases has the widest range where it may become
flammable when mixed with air? - Answer Acetylene
If a pressure-adjusting screw on an oxygen regulator becomes stiff, what must you
NEVER use on it? - Answer Oil or grease
Over what maximum gauge pressure should acetylene ever be used? - Answer 103 kPa
,(15 psi)
Which toxic gas is produced in welding on surfaces cleaned with chlorinated
hydrocarbon solvents? - Ans Phosgene gas
What is the usual max. OCV for an AC welding machine? - Ans 80 V
In an isometric drawing the sets of lines, (for width, length and depth) are at an angle of
how many degrees? - Ans 30°
What is the maximum number of view in an orthographic drawing? - Ans 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 easily cut with a standard 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, which side of the fillet weld symbol does the length of the weld
appear? LEFT RIGHT - Answer RIGHT
What is the direction of the electrons flow in an electrical arc?
A) anode --> cathode
B) cathode --> anode - Answer B) cathode --> anode
In arc welding, what can the temperature of the arc be greater than? __________ °
Celsius? - Answer 30,000
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