Arc welding, Shielded metal arc welding, Metal Inert gas welding
Arc Welding
description
Transcript of Arc Welding
ObjectivesObjectives
Examples of how Accidents can Result from Arc Examples of how Accidents can Result from Arc WeldingWelding
Necessary Personal Protective EquipmentNecessary Personal Protective Equipment
Ventilation RequirementsVentilation Requirements
Fire Prevention PrecautionsFire Prevention Precautions
Safe Operation of an Arc WelderSafe Operation of an Arc Welder
Welding, Cutting and Brazing Welding, Cutting and Brazing Accidents - CausesAccidents - Causes
Inadequately trained personnelInadequately trained personnel
Poor housekeeping practicesPoor housekeeping practices
Poor shop layoutPoor shop layout
Inadequate lighting and ventilationInadequate lighting and ventilation
Improper storage and movement of compressed gas Improper storage and movement of compressed gas cylinderscylinders
Welding, Cutting and Brazing Welding, Cutting and Brazing Accidents – Causes (Cont’d)Accidents – Causes (Cont’d)
Exposure of oxygen cylinders and fittings to Exposure of oxygen cylinders and fittings to oil/greaseoil/grease
Pointing welding or cutting torches at a concrete Pointing welding or cutting torches at a concrete surfacesurface
Electric shock due to improper groundingElectric shock due to improper grounding
Inhalation of toxic fumes or vaporsInhalation of toxic fumes or vapors
Welding, Cutting and Brazing – Welding, Cutting and Brazing – Fires and Explosions - CausesFires and Explosions - Causes
Proximity of combustible solids, liquids, or dustsProximity of combustible solids, liquids, or dusts
Presence of explosive mixtures of flammable gases Presence of explosive mixtures of flammable gases and airand air
Presence of an oxygen-enriched atmospherePresence of an oxygen-enriched atmosphere
Personal Protective EquipmentPersonal Protective Equipment
Fire retardant long sleeved coveralls without cuffsFire retardant long sleeved coveralls without cuffs
Sleeves and collars kept buttonedSleeves and collars kept buttoned
Leather gauntlet glovesLeather gauntlet gloves
High top leather shoesHigh top leather shoes
Helmets and gogglesHelmets and goggles
Personal Protective EquipmentPersonal Protective Equipment(Cont’d)(Cont’d)
Safety glasses (No contact lenses)Safety glasses (No contact lenses)
Flame-proof skull capFlame-proof skull cap
Hearing protectionHearing protection
Ventilation Ventilation
The Welder must be located in an area with The Welder must be located in an area with adequate ventilationadequate ventilation
Non-Hazardous MetalsNon-Hazardous Metals – –
Ventilation system will move minimum of Ventilation system will move minimum of 2000 cubic feet per minute of air per welder2000 cubic feet per minute of air per welder
Hazardous MetalsHazardous Metals – –
Use a supplied-air type respirator or a Use a supplied-air type respirator or a respirator specially designed to filter the specific respirator specially designed to filter the specific metal fumemetal fume
Fire Prevention Fire Prevention
Arc Welders can produce temperatures in excess of Arc Welders can produce temperatures in excess of 10,000 degrees F10,000 degrees F
Establish fire barriersEstablish fire barriers
Work on fire-resistant floorWork on fire-resistant floor
Work in environment free of flammable liquids and Work in environment free of flammable liquids and vaporsvapors
Check for necessity of Hot Work PermitCheck for necessity of Hot Work Permit
Fire Prevention (Cont’d) Fire Prevention (Cont’d)
Establish Fire WatcherEstablish Fire Watcher
- qualified person proficient in operation of - qualified person proficient in operation of available fire extinguishersavailable fire extinguishers
- duty to detect and prevent spread of fire- duty to detect and prevent spread of fire
Fill any cracks in floorFill any cracks in floor
Remove or protect combustiblesRemove or protect combustibles
Have fire extinguishers available and readyHave fire extinguishers available and ready
Safe Practices – Before Safe Practices – Before Operation Operation
Proper training for all operatorsProper training for all operators
Check all connectionsCheck all connections
Work lead firmly attached to workWork lead firmly attached to work
Contact surfaces of work clamps free of metal Contact surfaces of work clamps free of metal splatter particlessplatter particles
Coiled welding cable spread outCoiled welding cable spread out
Inspect work and electrode lead cablesInspect work and electrode lead cables
Safe Practices – During Safe Practices – During Operation Operation
Proper working surfaceProper working surface
Clean materialClean material
Good housekeeping practicesGood housekeeping practices
Use metal tongs and pliers to handle hot metalUse metal tongs and pliers to handle hot metal
Hot metal marked “HOT” with soapstoneHot metal marked “HOT” with soapstone
Always use Arc Welding Safety Checklist!Always use Arc Welding Safety Checklist!
Engine Powered WeldersEngine Powered WeldersSafety Precautions Safety Precautions
Operate in open well-ventilated areaOperate in open well-ventilated area
Never fuel engine while runningNever fuel engine while running
Wipe up spilled fuel immediatelyWipe up spilled fuel immediately
Never remove radiator pressure cap from liquid Never remove radiator pressure cap from liquid cooled engines while hot cooled engines while hot
Engine Powered WeldersEngine Powered WeldersSafety Precautions (Cont’d) Safety Precautions (Cont’d)
Stop engine before performing any maintenanceStop engine before performing any maintenance
Keep all guards and shields in placeKeep all guards and shields in place
Keep hands, hair, clothing away from moving Keep hands, hair, clothing away from moving partsparts
Key Safety Points Key Safety Points
Welder is properly installed and groundedWelder is properly installed and grounded
Never weld without adequate ventilationNever weld without adequate ventilation
Take proper precautions to prevent firesTake proper precautions to prevent fires
Protect entire body with fire retardant clothing, Protect entire body with fire retardant clothing, shoes and glovesshoes and gloves
Wear eye protection at all timesWear eye protection at all times
Key Safety Points Key Safety Points
Weld only in a fire safe areaWeld only in a fire safe area
Never do any welding, cutting or hot work on used Never do any welding, cutting or hot work on used drums, barrels, tanks or similar containersdrums, barrels, tanks or similar containers
Mark metal “HOT” with soapstoneMark metal “HOT” with soapstone
Keep a well stocked first aid kit handyKeep a well stocked first aid kit handy
AssessmentAssessment
Take a few moments to complete Take a few moments to complete the assessment -the assessment -
Assessment – Assessment – Key 1Key 1 1. 1.
XX Inadequately trained personnelInadequately trained personnel
XX Poor housekeeping practicesPoor housekeeping practices
X X Poor shop layoutPoor shop layout
Adequate lighting and ventilation Adequate lighting and ventilation
X X Improper storage and movement of compressed gas Improper storage and movement of compressed gas cylinderscylinders
XX Exposure of oxygen cylinders and fitting to oil/greaseExposure of oxygen cylinders and fitting to oil/grease
XX Pointing welding or cutting torches at a concrete Pointing welding or cutting torches at a concrete surfacesurface
XX Electric shock when motors, generators are not Electric shock when motors, generators are not groundedgrounded
XX Inhalation of toxic fumes or vapors from welding metals Inhalation of toxic fumes or vapors from welding metals
Assessment – Assessment – Key 2Key 2
2. Welders should avoid clothing with tears, snags, 2. Welders should avoid clothing with tears, snags, rips, or worn spots because these areas are easily rips, or worn spots because these areas are easily ignitedignited by by sparkssparks..
3. 3. TrueTrue
4. 4. FalseFalse
5. 5. FalseFalse
Assessment – Assessment – Key 3Key 3
6. 6. A and CA and C
7. 7. BB
8. A Firewatcher is a 8. A Firewatcher is a qualifiedqualified individual proficient in individual proficient in the operation of the operation of fire extinguishingfire extinguishing equipment. equipment.
9. A Firewatcher’s duty is to 9. A Firewatcher’s duty is to detectdetect and and preventprevent the the spread of fire produced by welding or cutting activities.spread of fire produced by welding or cutting activities.
Assessment – Assessment – Key 4Key 4
10.10.
XX All connections to the arc welding machine shall be All connections to the arc welding machine shall be checkedchecked
XX The work lead shall be firmly attached to the workThe work lead shall be firmly attached to the work
A Firewatcher shall be postedA Firewatcher shall be posted
X X Coiled welding cables shall be spread out beforeCoiled welding cables shall be spread out before
Welding helmets shall be on at all timesWelding helmets shall be on at all times
XX Work and electrode lead cables shall be inspected for Work and electrode lead cables shall be inspected for damagedamage
Cables with damaged insulation shall be repaired with Cables with damaged insulation shall be repaired with electricians tapeelectricians tape
XX Electrode cables shall be joined and insulated Electrode cables shall be joined and insulated