1. What is the term used to describe the following condition of lost corrosionresistance?
"When certain stainless steels are heated between 500-850° C, carbides format the grain
boundaries and cause a local depletion of chromium."
Note: Also known as "carbide precipitation" -- Chromium binds to carbides, and"sweats out"
at the grain boundaries
2. On a radiograph, undercut appears as a line.
(A) light
(B) dark
Answer: (B) dark
3. What is the Canadian Standard for safety in welding?
Answer: CSA W117.2
4. What is the typical three-phase input voltage in most Canadian weldingshops?
Answer: 600V
5. True or False: The cable from the workpiece back to the welding machine iscalled the
"ground lead".
Answer: False. The correct term is the "work lead".
6. What is the type of radiation that can damage living cells?
Answer: Ionizing
7. Name two examples of ionizing radiation.
Answer: X-rays and Gamma rays
8. What is the minimum suggested shade for a welding helmet when using5/32 SMAW
electrode at 150 A?
Answer: Shade 10
,9. Approx. how far could spatter travel when welding/cutting from 2.5m high?-
Answer: Possibly up to 6m
10. What is the toxic component contained in some copper alloys?
Answer: Beryllium
11. Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW]
Answer: FCAW
12. What do the terms TLV and TWA stand for?
Answer: TLV: Threshold limit valueTWA: Time weighted average
13. The action of UV light on oxygen produces which toxic gas?
Answer: Ozone
14. Which common fuel gas has the widest range where it can become flammable when
mixed with air?
Answer: Acetylene
15. What substance should you NEVER apply to a stiff pressure-adjustingscrew on an
oxygen regulator?: Oil or grease
16. What is the maximum gauge pressure that acetylene should be used?(kPa/psi)
Answer: 103 kPa (15 psi)
17. Which toxic gas is produced when welding on surfaces with chlorinatedhydrocarbon
solvents?
Answer: Phosgene gas
18. What is the typical max. OCV of an AC welding machine?
Answer: 80 V
19. In an isometric drawing, the lines (for width, length and depth) are inclinedat an angle of
how many degrees?
Answer: 30°
20. What are the maximum number of views in an orthographic drawing?
Answer: 6
21. What are the two general classes of picture drawings?
Answer: Perspective andIsometric
, 22. What are the 5 basic joints?
Answer:
1) Butt
2) Corner
3) T
4) Lap
5) Edge
23. What are the 5 basic weld types?
Answer:
1) Groove
2) Fillet
3) Plug/Slot
4) Surfacing
5) Edge
24. Plasma cutting torch temp can reach temperatures of
° Celsius.
Answer: 30,000
25. True or False: All plasma arc cutting equipment is operated using DCEN.-
Answer: True
26. True or False: Stainless steel can be readily cut with a normal oxy-fuel gasprocess.
Answer: False
27. What are the two basic methods of plasma torch operation?
Answer: Transferredand Non-Transferred arc
28. In North America, the 3 othographic views most commonly-used are: TOP,FRONT and
Side.
[RIGHT / LEFT]
Answer: LEFT
29. 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".
30. In a welding symbol, is the size of the weld located to the LEFT or RIGHTof the fillet
weld symbol?
Answer: LEFT
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