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CWB 2 ALL MODULES EXAM
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CWB 2 ALL MODULES EXAM
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CWB 2 ALL MODULES EXAM NEWEST ACTUAL EXAMCOMPLETE 90 QUESTIONS AND CORRECT 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
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
For out-of-position welding, would you select a small or large diameter electrode? -
ANSWER: A small diameter electrode
, Does GMAW use CC or CV? - ANSWER: CV
What happens to the SAW weld when you switch from DCEP to DCEN? - ANSWER:
Increased deposition rate, but less penetration
What is the temperature for storing low-hydrogen electrodes? - ANSWER: 120°
Celsius
When using a consumable electrode in DCEN, the majority of the heat is
concentrated on the __________.
(A) Electrode
(B) Workpiece - ANSWER: (A) Electrode
When using a non-consumable electrode in DCEN, the majority of the heat is
concentrated on the __________.
(A) Electrode
(B) Workpiece - ANSWER: (B) Workpiece
Which has a "drooping" curve characteristic - CC or CV? - ANSWER: CC
AC transformer welding power sources use a:
(A) step-up transformer
(B) step-down transformer - 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 - 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% - ANSWER: (C) 60%
What current/polarity is used when welding aluminum with GTAW?
(A) DCEN
(B) DCEP
(C) AC - ANSWER: (C) AC
True or False: a welding cable size designation "No. 4" is larger than a "No. 2". -
ANSWER: False.
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