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CWB LEVEL II QUESTIONS AND ANSWERS
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CWB LEVEL II QUESTIONS AND ANSWERS
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CWB LEVEL II QUESTIONS AND ANSWERSOn a radiograph, undercut appears as a _________ line.
(A) light
(B) dark - Answers-(B) dark
What is the Canadian Standard for safety in welding? - Answers-CSA W117.2
What is the typical three-phase input voltage in most Canadian welding shops? -
Answers-600V
True or False: The cable from the workpiece back to the welding machine is called the
"ground lead". - Answers-False. The correct term is the "work lead".
What is the type of radiation that can damage living cells? - Answers-Ionizing
Name two examples of ionizing radiation. - Answers-X-rays and Gamma rays
What is the minimum suggested shade for a welding helmet when using 5/32 SMAW
electrode at 150 A? - Answers-Shade 10
Approx. how far could spatter travel when welding/cutting from 2.5m high? - Answers-
Possibly up to 6m
The action of UV light on oxygen produces which toxic gas? - Answers-Ozone
Which common fuel gas has the widest range where it can become flammable when
mixed with air? - Answers-Acetylene
What substance should you NEVER apply to a stiff pressure-adjusting screw on an
oxygen regulator? - Answers-Oil or grease
What is the maximum gauge pressure that acetylene should be used? (kPa/psi) -
Answers-103 kPa (15 psi)
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon
solvents? - Answers-Phosgene gas
What is the typical max. OCV of an AC welding machine? - Answers-80 V
In an isometric drawing, the lines (for width, length and depth) are inclined at an angle
of how many degrees? - Answers-30°
,What are the maximum number of views in an orthographic drawing? - Answers-6
What are the two general classes of picture drawings? - Answers-Perspective and
Isometric
What are the 5 basic weld types? - Answers-1) Groove
2) Fillet
3) Plug/Slot
4) Surfacing
5) Edge
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
What is the toxic component contained in some copper alloys? - Answers-Beryllium
Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW] - Answers-FCAW
What do the terms TLV and TWA stand for? - Answers-TLV: Threshold limit value
TWA: Time weighted average
Is helium lighter or heavier than air? - Answers-Lighter
Plasma cutting torch temp can reach temperatures of __________ ° Celsius. - Answers-
30,000
True or False: All plasma arc cutting equipment is operated using DCEN. - Answers-
True
True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. -
Answers-False
What are the two basic methods of plasma torch operation? - Answers-Transferred and
Non-Transferred arc
, In North America, the 3 othographic views most commonly-used are: TOP, FRONT and
__________ Side.
[RIGHT / LEFT] - Answers-LEFT
What is the difference between a "weld symbol" and a "welding symbol"? - Answers-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? - Answers-LEFT
In a welding symbol, is the length of the weld located to the LEFT or RIGHT of the fillet
weld symbol? - Answers-RIGHT
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?
- Answers-30,000
Which welding process has the highest arc efficiency? - Answers-SAW
Arc voltage __________ when arc length is increased.
[Increased / Decreased] - Answers-Increases
In GTAW, what type of penetration and weld width can be expected when using DCEP?
- Answers-Shallow penetration, and wide weld
Which polarity is most often chosen for direct current GTAW welding of steels and why?
- Answers-DCEN. More heat concentrated at the workpiece --> deeper penetration
Does SMAW use CC or CV? - Answers-CC
For out-of-position welding, would you select a small or large diameter electrode? -
Answers-A small diameter electrode
Does GMAW use CC or CV? - Answers-CV
What happens to the SAW weld when you switch from DCEP to DCEN? - Answers-
Increased deposition rate, but less penetration
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