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Welding Fumes
What Are Welding Fumes ? Health Hazards MSHA Regulations Sampling Methods Controls
Welding Fumes
What Are Welding Fumes ? Health Hazards MSHA Regulations Sampling Methods Controls
What Are Welding Fumes ?
Welding Causes Solid Metal To Vaporize As Vaporized Metal Cools, It Condenses
To Reform As Solid Particles - FUMEFUME Fumes Are Very Small Particles - -
Usually Much Smaller Than Dust Dust Usually Larger Than 1 Micron Fumes Can Be As Small As 1/1,000 Micron
Unless Captured And Removed, Fumes Remain Suspended In Air Indefinitely
Composition of Welding Fumes Composition Varies Depending On:
Material Being Welded Welding Process, Rod, Electrode Type Coatings On Material, Rod, Electrode
Typical Welding Fume Constituents: Aluminum, Cadmium, Chromium, Iron, Moly Cobalt, Copper, Zinc, Manganese, Tin, Lead Nickel, Arsenic, Mercury, Vanadium, Beryllium, Magnesium, Titanium,
May Be Metal or Oxide
Welding Fumes
What Are Welding Fumes ? Health Hazards MSHA Regulations Sampling Methods Controls
Exposure Primarily By Inhalation
Exposure Primarily By Inhalation Fumes Are 100% Respirable
Exposure Primarily By Inhalation Fumes Are 100% Respirable What Does “Respirable” Mean ?
Exposure Primarily By Inhalation Fumes Are 100% Respirable What Does “Respirable” Mean ?
How Do You Know What You Are Being Exposed To ? Hazards ? Supplier Or Equipment Manufacturer Material Safety Data Sheet (MSDS) Assume Paint Contains Lead Assume Corrosion Resistant Coatings
Contain Zinc Or Cadmium Assume Wear Materials Contain
Manganese Assume High Strength Steel Contains
Chrome, Manganese, Moly, Nickel
Welding Fume Toxicity
Kidney Nervous Liver GI Lung
Aluminum X X
Beryllium X
Cadmium X X X X
Chromium X X X X
Cobalt X X X
Copper X X
Iron X X X X
Lead X X X
Manganese X X
Nickel X X
Zinc X X
Welding Fume Toxicity
Acute Toxicity Exposure To High Concentration Over
Relatively Short Time Symptoms Appear Relatively Quickly
After Exposure
Chronic Toxicity Exposure To Lower Concentration
Over Long Time (Months, Years) Symptoms Appear Long After Initial
Exposure
Welding Fume Toxicity
Exposure Usually Involves More Than One Metal Toxic Effects May Be AdditiveAdditive
Examples Blood - Manganese and Lead CNS - Manganese and Lead Kidney - Lead and Cadmium Respiratory System - Magnesium,
Manganese, Copper, and Zinc
Welding Fume Toxicity
Metal Fume Fever Symptoms Are Fever, Chills, Shaking Symptoms Appear 4-12 Hrs After Exp. Recovery Usually Within 1 Day Usually Associated With Brief High
Inhalation Exposure To Zinc, But Magnesium & Copper Also May Cause
Daily Exposure May Confer Immunity Symptoms May Return If Exposure
Interrupted (3-Day Weekend)
Welding Fume Toxicity Welding Fumes Can Cause Cancer
Arsenic (Lung, Lymphatic) Beryllium (Lung) Cadmium (Prostatic and Lung) Chromium (Lung) Nickel (Lung)
Welders May Also Be Exposed To: Silica, Asbestos, Ozone Thermal Decomposition of Paint, Flux,
Electrode Coatings (CO, CO2, NO, NO2, HCN, COCl2, Fluoride Gases, Smoke, Etc.)
Welding Fumes
What Are Welding Fumes ? Health Hazards MSHA Regulations Sampling Methods Controls
MSHA Regulations § 56/57.5001§ 56/57.5001 Exposure Limits
§56/57.5002§56/57.5002 Monitoring
§56/57.5005§56/57.5005 Controls
§56/57.14213(b)§56/57.14213(b) Ventilation
§56/57.20011§56/57.20011 Barricades, Warnings
Part 46 and Part 48 Part 46 and Part 48 Training
MSHA Regulations
§ 56/57.5001§ 56/57.5001 Establishes Exposure Limits For Airborne Contaminants TWA8 And Ceiling Limits Listed In
1973 ACGIH Booklet of ThresholdLimit Values (TLV’s)
TWA8 Time Weighted Average For 8 Hrs Ceiling Limits Cannot Be Exceeded For
Any Length Of Time ACGIH 1973 TLV Booklet References
1968 “PA Rules” For Short Term Limits
MSHA Regulations
§56/57.5002§56/57.5002 Dust, Gas, Mist, And Fume Surveys Shall Be Conducted As Frequently As Necessary To Determine The Adequacy Of Control Measures
§56/57.5005§56/57.5005 Control of Harmful Airborne Contaminants Shall Be, Insofar As Feasible, By Engineering Controls Respirators Permitted Under Certain
Circumstances
MSHA Regulations
§56/57.14213(b)§56/57.14213(b) All Welding Operations Shall Be Well Ventilated
§56/57.20011§56/57.20011 Areas Where Health or Safety Hazards Exist That Are Not Immediately Obvious Shall Be Barricaded Or Warning Signs Posted
Part 46 and Part 48 Part 46 and Part 48 Training
Welding Fumes
What Are Welding Fumes ? Health Hazards MSHA Regulations Sampling Methods Controls
Sampling Methods For Compliance With §56/57.5001§56/57.5001 And
§56/57.5002§56/57.5002 Full Shift Or Short Term
Sampling Methods For Compliance With §56/57.5001§56/57.5001 And
§56/57.5002§56/57.5002 Full Shift Or Short Term Sample Pump, Pump Calibrator, Filters
Sampling Methods For Compliance With §56/57.5001§56/57.5001 And
§56/57.5002§56/57.5002 Full Shift Or Short Term Sample Pump, Pump Calibrator, Filters
Place Filter In Breathing Zone Under Hood
Sampling Methods For Compliance With §56/57.5001§56/57.5001 And
§56/57.5002§56/57.5002 Full Shift Or Short Term Sample Pump, Pump Calibrator, Filters
Place Filter In Breathing Zone Under Hood Pump Draws Air Over Filter; Contaminants
Captured On Filter
Sampling Methods
Analytic Lab Determines Weights Of Individual Contaminants On Filter
Weights Converted To Concentrations
Sampling Methods
Analytic Lab Determines Weights Of Individual Contaminants On Filter
Weights Converted To Concentrations
Measured Concentration Compared To Established Exposure Limit Measured Less Than Limit - - No Action Req’d Measured Over Limit - - Implement Controls
Welding Fumes
What Are Welding Fumes ? Health Hazards MSHA Regulations Sampling Methods Controls
Controls (§56/57.5005)
Feasible Engineering Controls Personal Protective Equipment (PPE)
PPE Allowed As Means Of ComplianceAs Means Of Compliance Only In Limited SituationsWhere Feasible Engineering Controls Do
Not ExistWhile Installing Engr. ControlsOccasional Entry Into Hazardous
Atmosphere For Maintenance
Engineering Controls General Ventilation
Natural or Mechanically Induced (Fans) Airflow pushed Or Pulled Over Work Area That Dilutes and Carries Away Contaminants
General Ventilation Outdoors - Wind Indoors
Open Shop Doors/Windows Fans: Fixed - Roof, Walls, Windows Fans: Portable Blow Fresh Air Into Work Area, But Don’t Blow
Fumes Into Welder’s Breathing Zone Need Provision For “Make Up” Air
Engineering Controls Local Exhaust Ventilation
Captures and Removes Airborne Contaminants Before They Escape Into Workplace Air
Local Exhaust Always Preferred For Toxic Airborne Contaminants
Local Exhaust Ventilation Capture Hood & Fixed Duct System
Local Exhaust Ventilation Portable “Fume Eliminator”
Local Exhaust Ventilation Down Draft Table
Respiratory Protection Air Purifying Or Supplied Air
May Be Integral With Welding Hood
NIOSH Part 84 Approved For Fumes
Welder’s PoweredAir PurifyingRespirator(PAPR)
Half-Mask CartridgeRespirator
Supplied-AirRespirator
Respiratory Protection Air Purifying Or Supplied Air
May Be Integral With Welding Hood
NIOSH Part 84 Approved For Fumes Respirator Use Must Include Implementation
of Respiratory Protection Program (See ANSI Z88.2-1969) Written Procedures on Selection and Use Respirator Training and Fit Testing Respirator Inspection, Cleaning, Storage Workplace Surveillance Medical Evaluation Recommended
Thank You
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