CWB WELDING INSPECTOR LEVEL III
STUDY GUIDE 2026 COMPREHENSIVE
QUESTIONS AND STEP BY STEP
SOLUTIONS
◉ Effects of Acetylene
Answer: oxygen deficiency, asphyxiation, coma, death, dizziness,
headache, nausea, fatigue
◉ Effects of hydrogen chloride, phosgene
Answer: delayed irritation & toxic effect on upper respiratory tract;
excess fluid in lungs
◉ Argon, carbon dioxide, helium, nitrogen
Answer: gases that are odorless and invisible; not detectable by
human senses
◉ Argon
Answer: heavier than air; tends to accumulate in the lower portion
of confined space
◉ Helium
, Answer: lighter than air; accumulates in the upper portion of the
confined space
◉ Ozone
Answer: formed by UV light emitted from the air interacting with the
oxygen; has pungent smell and respiratory irritant
◉ How to control ozone
Answer: changing the consumable or the welding procedure
◉ Ozone is problem on
Answer: GTAW, GMAW on aluminum, SS
◉ Lockout/Tagout
Answer: used to de-energize or isolate energy sources
◉ Fire Triangle
Answer: diagram to understand the aspect of fire and explosions
◉ Requirements to start a fire
Answer: fuel, oxygen, and source of heat or ignition
STUDY GUIDE 2026 COMPREHENSIVE
QUESTIONS AND STEP BY STEP
SOLUTIONS
◉ Effects of Acetylene
Answer: oxygen deficiency, asphyxiation, coma, death, dizziness,
headache, nausea, fatigue
◉ Effects of hydrogen chloride, phosgene
Answer: delayed irritation & toxic effect on upper respiratory tract;
excess fluid in lungs
◉ Argon, carbon dioxide, helium, nitrogen
Answer: gases that are odorless and invisible; not detectable by
human senses
◉ Argon
Answer: heavier than air; tends to accumulate in the lower portion
of confined space
◉ Helium
, Answer: lighter than air; accumulates in the upper portion of the
confined space
◉ Ozone
Answer: formed by UV light emitted from the air interacting with the
oxygen; has pungent smell and respiratory irritant
◉ How to control ozone
Answer: changing the consumable or the welding procedure
◉ Ozone is problem on
Answer: GTAW, GMAW on aluminum, SS
◉ Lockout/Tagout
Answer: used to de-energize or isolate energy sources
◉ Fire Triangle
Answer: diagram to understand the aspect of fire and explosions
◉ Requirements to start a fire
Answer: fuel, oxygen, and source of heat or ignition
