weld safety

what is radiant energy

they are harmful light rays emitted from a welding arc when welding or from an oxyfuel flame

what are the 3 types of radiant energy

visible ultraviolet and infrared

traits of visible light

they can cause eye strain or in extreme cases temporary or permanent blindness

traits of UV rays

they are invisible and can cause burns to exposed skin and blisters on the eyeballs they are more common with electric welding

what is arc flash

it is the term describe as your eyes burning by UV rays when experiencing arc flash your eyes develop small water blisters and is painful

up to what temperature can a welding arc reach

3316C

what is the best clothing to wear when welding

basic ppe leather wool or denim because they can repel sparks and slag

what are fumes and gases

they are small condensed particles of metal or other substances that are vaporized when welding or cutting

what gas is created when welding

carbon monoxide and nitrogen they are very toxic

what is a carcinogens

they are very toxic gasses that can be fatal in high enough concentrations

what is metal fever

a temporary flu like illness from inhaling oxide fumes like zinc

what is OEL

it stands for occupational exposure limits they are the maximum concentration of hazardous materials a healthy person can endure before suffering adverse health effects

what is OEL based of

its based on a 8 hour work day and a 15-min short term exposure that should not be exceeded

what are the 4 kinds of ventilation

plume natural local portable

what is the plume

its a safe practice of moving your head to the side of the on coming fumes doesnt ensure 100% reduced exposure

what is natural ventilation

doing work outside or near an open door to let fumes be vented out naturally

what is local ventilation

have an exhaust fan capture fumes at the source and puts them outside

what is a portable smoke extractor

same thing as a local ventilation with the added advantage of it being able to move

dangers of AC and DC

AC is considered more dangerous than DC at equal voltage it causes your muscles to spasm and tighten your grip while as DC will throw you away

at what voltage can circuits be deadly

200-250V because it does not have the power to throw you out leaving you there

at what amperage can be deadly

15mA-20mA can stop you from releasing your grip and cause death

how long can current flow till it becomes deadly

1-3 seconds can be fatal

how to avoid electric shock

use a GFCI ground fault circuit interrupter wear proper clothing use electrode holders

how to rescue shock victims

1. alert proper authorities

2. act quick

3. dont touch victim switch off the electricity

4. use insulated items to move conductor

what should you do before welding or cutting

check surrounding area of fire and explosion hazards

what to do when cutting or welding near flammable areas

DONT DO IT STUPID