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Copyright  Progressive Business Publications Blue Ridge Safety Association Safety Presentations Welding Cutting Brazing.

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Presentation on theme: "Copyright  Progressive Business Publications Blue Ridge Safety Association Safety Presentations Welding Cutting Brazing."— Presentation transcript:

1 Copyright  Progressive Business Publications Blue Ridge Safety Association Safety Presentations Welding Cutting Brazing

2 Copyright  Progressive Business Publications Safety Hazards of Welding Fire and explosions Compressed gases and cylinders Confined spaces Electrical hazards Dangerous machinery Trips and falls

3 Copyright  Progressive Business Publications Health Hazards of Welding Welding fumes and smoke Heat and sparks Visible light, ultraviolet and infrared radiation Musculoskeletal injuries Noise

4 Copyright  Progressive Business Publications Fire Prevention: Basic Precautions Asses the fire hazards If object to be welded or cut can’t be easily moved, remove all fire hazards in vicinity If object and fire hazards can’t be moved, use guards to confine heat, sparks and slag If these requirements can’t be met, then welding shouldn’t be done Have fire extinguishers ready for instant use

5 Copyright  Progressive Business Publications Special Precautions: Fire Watch Purpose: detect and extinguish smoldering fires Required for locations where more than a minor fire might develop or: –Appreciable combustible materials closer than 35 feet to operation OR more than 35 feet away, but easily ignitable by sparks –Wall of floor openings expose combustible materials within a 35-radius –Combustible materials on other side of walls/ceilings Maintained for at least 1/2 hour after completion

6 Copyright  Progressive Business Publications Fire Prevention: Welding is Prohibited in Certain Areas Areas not authorized by management Buildings with impaired sprinkler systems Areas with explosive atmospheres Areas where explosive atmospheres may develop

7 Copyright  Progressive Business Publications Fire Prevention: Used containers Make sure used drums barrels, tanks or other containers have been thoroughly cleaned Disconnect pipes or connections to the container

8 Copyright  Progressive Business Publications Personal Protection: Fall Protection When working at heights –Use railings, safety belts, lifelines or other safeguards –Protect workers below from falling sparks or slag Place welding cables and other equipment clear of passageways, ladders or stairways

9 Copyright  Progressive Business Publications Personal Protection: Eye Protection Use helmets, shields and goggles during arc welding or cutting Use goggles or other eye protection during gas welding or oxygen cutting operations Shield other from welding light with an individual booth or screen, if practical

10 Copyright  Progressive Business Publications Personal Protection: Eye Protection - Shading Requirments Shielded metal arc welding10 Gas shielded arc welding (non-ferrous)11 Gas-shielded arc welding (ferrous)12 Torch Brazing 3 or 4 Heavy cutting (6 inches & over) 5 or 6

11 Copyright  Progressive Business Publications Personal Protection: Clothing Welding gloves, gauntlets and sleeves Flame resistant aprons High-cut safety boots and leggings Shirts: heavyweight, wool, sleeved, collars buttoned, no pockets Pants: no cuffs and long enough to extend over boots For overhead work: shoulder capes, skullcaps, ear protection

12 Copyright  Progressive Business Publications Personal Protection: Ventilation Ensure adequate ventilation prior to working Use local exhaust ventilation where needed Respirators worn: –When cancer-causing agents present –During certain confined space work Materials requiring extra precautions: fluorine compounds, zinc, lead, beryllium, cadmium, mercury, cleaning compounds, stainless steel

13 Copyright  Progressive Business Publications Before Entering Confined Spaces Acquire confined space permit Ensure adequate ventilation –Test before entering for flammable/toxic gases or oxygen deficiency –If flammable or toxic gases are present - ventilate –If ventilation is inadequate, use a respirator Disconnect pipes, ducts and power lines Leave gas cylinders and welding machines outside of the confined space

14 Copyright  Progressive Business Publications Confined Spaces Attendant must observe the welder and be ready to execute a pre-planned emergency rescue plan If arc welding is suspended for a period of time: –Remove electrodes from holders –Disconnect machines from power sources If gas welding is suspended for a period of time: –Close the torch valves –Shut off the gas supply to the torch –Remove the torch and hose, if practical

15 Copyright  Progressive Business Publications Cylinder Storage In a well-ventilated, dry, location >20 ft away from highly combustible materials such as oil Away from sources of heat and ignition Away from high traffic areas and exits Stored in compatible groups –Oxygen and Acetylene: separated by 20 feet or a 5-foot wall with 1/2-hour fire rating In upright position with valve protection caps on and secured with straps or chains

16 Copyright  Progressive Business Publications Cylinder Handling Never work with unidentified cylinders Refer to MSDS for specific hazards, special handling instructions, emergency response and first aid information Inspect cylinders for damage prior to work When transporting: –Secure to wheeled hand cart with the regulator removed –Never use valve caps to lift the unit –Don’t drop or bang

17 Copyright  Progressive Business Publications Cylinder Handling (cont’d) Valve protection caps must always be in place when not in use - empties included If cylinder must be left unattended, close cylinder valve and shut down system Keep cylinder in an upright position at all times Keep cylinders and valve caps free from oil or grease Mark work areas when finished work

18 Copyright  Progressive Business Publications Placement of Cylinders During Use Cylinders must be placed where sparks, hot slag or flames can’t reach them If that’s not possible, use fire-resistant shields Keep cylinders away from electrical circuits or objects used for grounding Cylinders must be placed outside any confined space

19 Copyright  Progressive Business Publications To Begin Work “Crack” the cylinder valve Ensure regulators are compatible, clean and in good condition before attaching them Make sure hoses and connections are secure When opening the cylinder valve, stand to the side and open s-l-o-w-l-y. Keep any vendor-supplied keys in place Keep the valve within easy reach

20 Copyright  Progressive Business Publications Purge Hoses Prior to Lighting First, acetylene –Open acetylene cylinder valve 3/4 turn –Open torch valve 1/4 turn –Adjust to working pressure with regulator screw –Close torch valve Then, oxygen –Open oxygen cylinder valve fully (slowly) –Open torch valve 1/4 turn –Adjust to working pressure with regulator screw –Close torch valve

21 Copyright  Progressive Business Publications Lighting and Shutting the Torch To light torch: –Reopen acetylene torch valve –Light with friction lighter: Never matches Never cigarettes –Open oxygen 1/4 turn and adjust flame To shut off torch: –Close torch valves: acetylene then oxygen –Close cylinder valves: acetylene then oxygen –Open both torch valves to release pressure –Shut off regulator adjusting handle –Close torch valves

22 Copyright  Progressive Business Publications For Safe Use of Acetylene Never used at pressure in excess of 30 psi absolute or 15 psi gage Never open acetylene valve more than 1 1/2 turns. Never use copper fittings or connections

23 Copyright  Progressive Business Publications Arc Welding and Cutting Ensure the work area is dry Double-check the grounding Check connections to the machine –Make sure work lead is firmly attached –Keep metal clamps free from debris Never use cables with splices within 10 feet of the holder Replace cables with damaged insulation or exposed bare connectors

24 Copyright  Progressive Business Publications Arc Welding and Cutting (cont’d) Spread out cables Never coil cables around your body Never strike an arc on a gas cylinder Never change polarity switch during operation If work must be stopped, disconnect power source and remove electrodes Store holders where they can’t make unwanted contact

25 Copyright  Progressive Business Publications Summary Safety and health hazards = special precautions Fire prevention Personal Protection –Fall safety –PPE –Confined spaces –Ventilation Use of compressed gas cylinders Safe welding procedures

26 Copyright  Progressive Business Publications Thank you for supporting BRSA We appreciate your comments about the effectiveness of this training method and the delivery system your comments to


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