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Welding, Cutting, And Brazing

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Arc Welding Common Processes Shielded metal arc welding (stick welding) Gas metal arc welding (MIG welding) Gas tungsten arc welding (TIG welding) ... – PowerPoint PPT presentation

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Title: Welding, Cutting, And Brazing


1
Welding, Cutting, And Brazing
2
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

3
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

4
Welding Hazards
  • Firescaused by unsafe welding or cutting
    operations
  • Burns
  • Electric Shock
  • Light radiation ultraviolet, infrared, and
    intense visible light
  • Air Contaminants (gases, fumes, smoke)

5
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

6
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

7
Ventilation
  • 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

8
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)

9
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

10
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

11
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

12
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, dont use it

13
Use Protective Devices
  • Pressure relief valves, backflow preventers or
    check valves
  • Flash back arrestors
  • Fuel gas hosered (sometimes black)
  • Oxygen hosegreen
  • Hose protection required
  • Pressure-reducing regulators

14
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

15
Lens Shades
  • Generally, use a 45 shade for
  • Torch brazing
  • Oxy-fuel gas cutting/welding

16
Oxy-Acetylene WeldingAny Questions?
  • Any questions about oxy-acetylene welding safety?

17
Arc WeldingCommon 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

18
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 areaspromotes electric shock
    hazard
  • Avoid oil, grease, and flammables as they pose a
    fire hazard

19
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

20
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

21
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

22
Lens Shades
  • Generally, use a 1014 shade for
  • Shielded metal arc
  • Gas metal arc
  • Gas tungsten arc

23
Arc WeldingAny Questions?
  • Any questions about arc welding?

24
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
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