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 value
TWA: Time weighted average
13. Is helium lighter or heavier than air?
Answer: Lighter
14. The action of UV light on oxygen produces which toxic gas?
Answer: Ozone
15. Which common fuel gas has the widest range where it can become flammable when
mixed with air?
Answer: Acetylene
16. What substance should you NEVER apply to a stiff pressure-adjustingscrew on an
oxygen regulator?
Answer: Oil or grease
17. What is the maximum gauge pressure that acetylene should be used?(kPa/psi)
Answer: 103 kPa (15 psi)
18. Which toxic gas is produced when welding on surfaces with chlorinatedhydrocarbon
solvents?
Answer: Phosgene gas
19. What is the typical max. OCV of an AC welding machine?
Answer: 80 V
20. In an isometric drawing, the lines (for width, length and depth) are inclinedat an angle of
how many degrees?
Answer: 30°
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