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Welding, Cutting, And Brazing. Session Objectives. You will be able to: Identify major safety and health hazards of welding Select appropriate PPE for welding, cutting, and brazing Implement controls to prevent or control fires. Types of Welding.

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Presentation Transcript
session objectives
Session Objectives
  • You will be able to:
    • Identify major safety and health hazards of welding
    • Select appropriate PPE for welding, cutting, and brazing
    • Implement controls to prevent or control fires
types of welding
Types of Welding
  • Welding includes 60 or more process variations
  • Electric welding and oxy-fuel gas welding
  • Welding/cutting occurs at most businesses at some point
welding hazards
Welding Hazards
  • Fires—caused by unsafe welding or cutting operations
  • Burns
  • Electric Shock
  • Light radiation— ultraviolet, infrared, and intense visible light
  • Air Contaminants (gases, fumes, smoke)
basic fire prevention
Basic Fire Prevention
  • Inspect welding area before starting
  • Remove fire hazards
  • Install guards
  • Welding or cutting must NOT take place unless hazards removed or guards installed
  • Obtain a hot work permit before starting operations to ensure that all fire hazards are controlled
  • Post a fire watch person 1/2 hour after operation ceases
fire prevention cont
Fire Prevention (cont.)
  • Never weld in explosive atmospheres
  • Do not weld on used containers
  • Test potentially explosive containers for flammable atmospheres
  • Shut off cylinder valves when not in use
  • Three factors govern the amount of contamination to which welders may be exposed:
    • Dimensions of the space
    • Number of welders
    • Possible evolution of hazardous fumes
  • Management must ensure welders have proper protection and ventilation
oxygen fuel gas welding
Oxygen-Fuel Gas Welding
  • Acetylene
    • Flammable
    • Unstable
    • Cannot be used above 15 psi
  • Oxygen
    • Added to support fuel gas flame and obtain high temperature for melting steel (welding)
basic rules for oxy acetylene welding
Basic Rules for Oxy-acetylene Welding
  • Ensure the safety fuse plug or disk is functional
  • Attach regulator
  • Stand to one side of regulator
  • Open cylinder valve slowly
  • Not more than 15 psi
basic rules for oxy acetylene welding cont
Basic Rules for Oxy-acetylene Welding (cont.)
  • Purge oxygen and acetylene lines
  • Light the acetylene
  • Never use oil or grease near oxygen
  • Do not use oxygen to clean or blow off dirt or clothing
  • Keep your work area clean
store gas cylinders safely
Store Gas Cylinders Safely
  • The storage area must be well ventilated
  • Keep fuel cylinders 20 feet or more from combustibles
  • Close valves, ensure valves are protected
  • Limit inside storage to 2,000 cubic feet
  • Store cylinders in the upright position and secured from falling
  • Separate oxygen from fuel gas
follow gas cylinder precautions
Follow Gas Cylinder Precautions
  • Never lift cylinders by the service valve or valve protection (use slings, net, or other approved means)
  • Keys, handles, and hand wheels must be present
  • Use the proper regulator
  • Open acetylene valve no more than 11/2 turns
  • If in doubt about a cylinder, don’t use it
use protective devices
Use Protective Devices
  • Pressure relief valves, backflow preventers or check valves
  • Flash back arrestors
  • Fuel gas hose—red (sometimes black)
  • Oxygen hose—green
  • Hose protection required
  • Pressure-reducing regulators
protect yourself
Protect Yourself
  • Keep working surfaces clean and clear
  • Light torches with a striker, not a lighter!
  • Wear face and eye protection
    • Use safety glasses under welding hood and burning goggles with proper shading
  • Wear protective body clothing
    • Avoid synthetic clothing
    • Use leather gloves with gauntlet
lens shades
Lens Shades
  • Generally, use a 4–5 shade for:
    • Torch brazing
    • Oxy-fuel gas cutting/welding
oxy acetylene welding any questions
Oxy-Acetylene Welding—Any Questions?
  • Any questions about oxy-acetylene welding safety?
arc welding common processes
Arc Welding—Common Processes
  • Shielded metal arc welding (stick welding)
  • Gas metal arc welding (MIG welding)
  • Gas tungsten arc welding (TIG welding)
  • Flux cored arc welding
  • Submerged arc welding
  • Arc cutting
  • Plasma arc cutting
arc welding hazards and safety measures
Arc Welding Hazards and Safety Measures
  • Hazards
    • Arc gives off ultraviolet and infrared rays the same as those causing sunburn
    • Exposure within several inches to a few feet can cause flash burn to eyes and skin
  • Safety measures
    • Avoid wet or damp areas—promotes electric shock hazard
    • Avoid oil, grease, and flammables as they pose a fire hazard
shielding and flash screens
Shielding and Flash Screens
  • Air must be kept away from weld area
  • Shielding protects the integrity of the weld joint
  • Flux or gas mixture is used as a “shield”
  • Welders need to erect flash screens around them to protect others in area
maintain equipment properly
Maintain Equipment Properly
  • Welding machines must be grounded
  • Work area must be dry and free of hazards
  • Connections must be tightly made
  • Cable splices within 10 feet of holder are prohibited
  • Cables must be maintained and conductors well insulated
protect yourself1
Protect Yourself
  • Wear welding helmets with proper shading depending on type of arc
  • DO NOT use brazing goggles
  • Wear safety glasses under helmet
  • Wear leather gloves with gauntlets
  • Use ventilation or respirators
  • Wear leather bibs, sleeves, or jackets to prevent burns from slag, sparks, and ultraviolet
lens shades1
Lens Shades
  • Generally, use a 10–14 shade for:
    • Shielded metal arc
    • Gas metal arc
    • Gas tungsten arc
arc welding any questions
Arc Welding—Any Questions?
  • Any questions about arc welding?
key points to remember
Key Points to Remember
  • Major hazards include:
    • Fire
    • Burns
    • Shock
    • Toxic exposures
  • Follow proper procedures to prevent fires
  • Use appropriate engineering controls
  • Wear appropriate PPE