CWB Welding Inspector Level 2 Exam

CWB Welding Inspector Level 2 Exam

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CWB Welding Inspector Level 2 Exam

• 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

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• 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

• Is helium lighter or heavier than air?

Answer: Lighter

• 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°

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