WX-005 – Welding Safety, Confined Space,
Hazardous Gases, Ventilation & WHMIS
Essentials – Complete Study Reference (2025)
100ppm - immediately dangerous to life and health✅✅✅10ppm - OEL ceiling limit for
h2s✅✅✅
2-5ppm - results nausea, tearing of the eyes and headaches✅✅✅
20-150 ppm - causes irritation of the eyes, nose, throat, and lungs✅✅✅
Anchoring Systems - 1. designed fixed supports are anchor points permanently installed on a
structure; pre-engineered, load rated✅✅✅
Anchoring Systems - 2. temporary fixed supports are anchor points added to an existing
structure; designed to be connected to an existing structure✅✅✅
Anchoring Systems - 3. existing structural features are anchor points utilizing a part of an
existing structure; located at or around structural elements✅✅✅
Argon - heavier than air; tends to accumulate in the lower portion of confined
space✅✅✅
Argon, carbon dioxide, helium, nitrogen - gases that are odorless and invisible; not detectable
by human senses✅✅✅
Chemical Hazards - exposure to fumes; contact with caustic cleaner/degreaser✅✅✅
Class A (fire) - ordinary combustibles; wood or paper✅✅✅
Class B (fire) - flammable liquids; not efficient to handle the high temp cooking oil and
grease fires in kitchen✅✅✅
Class C - Live electrical equipment✅✅✅
Class D - combustible metals✅✅✅Class K (fire) - Oil and grease✅✅✅
Confined Space - atmospheric hazard may occur due to construction, location, content, type
of work✅✅✅
Confined Space - fully or partially enclosed space✅✅✅
Confined Space - has limited or restricted access of egress or an internal configuration that
can complicate first aid✅✅✅
, Confined Space - not designed or intended for continuous occupancy✅✅✅
Confined space entry permits - cover any activity to take place within a designated confined
space✅✅✅
Confined space procedure - shall develop prior entering the confined space✅✅✅
Connecting device - key part of any fall protection system; secure two points of a system
together✅✅✅
Effects of Acetylene - oxygen deficiency, asphyxiation, coma, death, dizziness, headache,
nausea, fatigue✅✅✅
Effects of Hydrogen - explosion, fire, asphyxiation✅✅✅
Effects of hydrogen chloride, phosgene - delayed irritation & toxic effect on upper respiratory
tract; excess fluid in lungs✅✅✅
Electromagnetic fields and high-frequency voltage - may cause interference w/ cardiac
pacemakers or other implanted electromedical devices✅✅✅
Emergency Rescue - provide a plan for the safe recovery of a fallen worker w/out causing
additional injury or putting someone at risk✅✅✅
Emergency response plan - policies and procedures that are developed to ensure workers
could prepare, response, and recover in a hazardous incident✅✅✅
Employee Orientation - H&S program that includes orientation meetings for new
employees✅✅✅
Fall arrest system - must prevent a worker from hitting any object or the ground; must meet
the requirements of the jurisdiction✅✅✅
Fall protection - needed when working 3 m (10ft) or more above a lower level✅✅✅
Fall restraint system - intended to keep workers from falling over unprotected
edges✅✅✅
FCAW, GMAW, PAW, GTAW - uses shielding gases such as argon, carbon dioxide, helium
& nitrogen to protect the molten weld puddle✅✅✅
Fire Triangle - diagram to understand the aspect of fire and explosions✅✅✅
General/Dilution Ventilation - uses air movement to remove or dilute the contaminated air
from welding area and replenish fresh air✅✅✅
GHS - Globally Harmonized System✅✅✅
GHS - internationally recognized hazard identification and communication system✅✅✅
Hazardous Gases, Ventilation & WHMIS
Essentials – Complete Study Reference (2025)
100ppm - immediately dangerous to life and health✅✅✅10ppm - OEL ceiling limit for
h2s✅✅✅
2-5ppm - results nausea, tearing of the eyes and headaches✅✅✅
20-150 ppm - causes irritation of the eyes, nose, throat, and lungs✅✅✅
Anchoring Systems - 1. designed fixed supports are anchor points permanently installed on a
structure; pre-engineered, load rated✅✅✅
Anchoring Systems - 2. temporary fixed supports are anchor points added to an existing
structure; designed to be connected to an existing structure✅✅✅
Anchoring Systems - 3. existing structural features are anchor points utilizing a part of an
existing structure; located at or around structural elements✅✅✅
Argon - heavier than air; tends to accumulate in the lower portion of confined
space✅✅✅
Argon, carbon dioxide, helium, nitrogen - gases that are odorless and invisible; not detectable
by human senses✅✅✅
Chemical Hazards - exposure to fumes; contact with caustic cleaner/degreaser✅✅✅
Class A (fire) - ordinary combustibles; wood or paper✅✅✅
Class B (fire) - flammable liquids; not efficient to handle the high temp cooking oil and
grease fires in kitchen✅✅✅
Class C - Live electrical equipment✅✅✅
Class D - combustible metals✅✅✅Class K (fire) - Oil and grease✅✅✅
Confined Space - atmospheric hazard may occur due to construction, location, content, type
of work✅✅✅
Confined Space - fully or partially enclosed space✅✅✅
Confined Space - has limited or restricted access of egress or an internal configuration that
can complicate first aid✅✅✅
, Confined Space - not designed or intended for continuous occupancy✅✅✅
Confined space entry permits - cover any activity to take place within a designated confined
space✅✅✅
Confined space procedure - shall develop prior entering the confined space✅✅✅
Connecting device - key part of any fall protection system; secure two points of a system
together✅✅✅
Effects of Acetylene - oxygen deficiency, asphyxiation, coma, death, dizziness, headache,
nausea, fatigue✅✅✅
Effects of Hydrogen - explosion, fire, asphyxiation✅✅✅
Effects of hydrogen chloride, phosgene - delayed irritation & toxic effect on upper respiratory
tract; excess fluid in lungs✅✅✅
Electromagnetic fields and high-frequency voltage - may cause interference w/ cardiac
pacemakers or other implanted electromedical devices✅✅✅
Emergency Rescue - provide a plan for the safe recovery of a fallen worker w/out causing
additional injury or putting someone at risk✅✅✅
Emergency response plan - policies and procedures that are developed to ensure workers
could prepare, response, and recover in a hazardous incident✅✅✅
Employee Orientation - H&S program that includes orientation meetings for new
employees✅✅✅
Fall arrest system - must prevent a worker from hitting any object or the ground; must meet
the requirements of the jurisdiction✅✅✅
Fall protection - needed when working 3 m (10ft) or more above a lower level✅✅✅
Fall restraint system - intended to keep workers from falling over unprotected
edges✅✅✅
FCAW, GMAW, PAW, GTAW - uses shielding gases such as argon, carbon dioxide, helium
& nitrogen to protect the molten weld puddle✅✅✅
Fire Triangle - diagram to understand the aspect of fire and explosions✅✅✅
General/Dilution Ventilation - uses air movement to remove or dilute the contaminated air
from welding area and replenish fresh air✅✅✅
GHS - Globally Harmonized System✅✅✅
GHS - internationally recognized hazard identification and communication system✅✅✅
