Transcript Subpart J Welding and Cutting

Subpart J
Welding and Cutting
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only. You should independently verify and satisfy yourself as to its accuracy. The AHBSIF does not assume any liability for damages
arising from the use of this information or exhibits and attachments thereto and renders no opinion that any of the terms, conditions,
and/or cited federal standards in this document and the exhibits and attachments should be explicitly followed by the fund member.
Seek specific guidance from the appropriate regulator (OSHA) or professional advisor.
Potentially Hazardous Fumes and
Gases
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Fumes – Solid particles
that originate from the
welding media, base
metal, or coating
Gas – Generated by the
shielding gas or process
radiation
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Nickel
Zinc
Iron Oxide
Copper
Cadmium
Fluorides
Manganese
Chrome & Gases
Effects of Overexposure
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Acute Effects
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Irritation of eyes, skin,
respiratory system
nausea, headaches,
dizziness
Metal Fume Fever
Asphyxiation (confined
space)
Chronic Effects
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Central nervous system
impairment
Respiratory illness
Reproductive disorders
Possible links to
Parkinson’s
Radiation
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Visible – intense light
emitted during welding
operations
Infrared - produced by
electric arc and other
flame cutting
equipment
Ultraviolet - generated
by all arc processes
Radiation Effects - Influencing
Factors
Wavelength
 Intensity
 Duration of
exposure
 Exposure may
result in skin burns
or eye damage
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Common Welding Techniques
MIG Welding
 TIG Welding
 MAPP Gas
 Oxy-fuel Welding
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MIG Welding
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“Metal Inert Gas”
Semi-automatic or automatic arc welding
process in which a continuous and consumable
wire electrode and a shielding gas are fed
through a welding gun.
Can use alternating or direct current, DC is
most common
Typically used with steel
Fast welding technique
TIG Welding
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“Tungsten Inert Gas”
Uses a nonconsumable tungsten electrode and
filler metal to produce the weld.
A shielding gas such as argon protects the
process from atmospheric contamination
Commonly used with Aluminum, Magnesium,
Copper, light gauge Stainless Steel
Slower than other welding techniques
Harder to master than other forms of welding
but produces higher quality and stronger welds
MAPP Gas
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“Methyl Acetylene Propodiene”
Consists of LPG mixed with MAPP
Does not require dilution or special container
fillers during transport which allows a greater
volume of gas to be transported at the same
given weight
Most commonly used for brazing and soldering
Ideal for aluminum and copper
Oxy-fuel Welding
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“Oxyacetylene Welding” aka Gas Welding
Two pieces are heated to a temperature
that produces a shared pool of molten
metal.
The molten pool is supplied with
additional metal called filler.
Safe Work Practices
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The surrounding work area should be clean and free
of potentially combustible material
A fire extinguisher should be kept on hand at all
times
Good ventilation is a must for all welding operations
Personal protective equipment (PPE) should include
eye and face protection as well as protective clothing
Less toxic materials should be substituted when
possible
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Cadmium-free silver solders
Asbestos-free electrodes
Pre-Shift Inspection
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Leads – insulation breech, kinks
Torch – tip, valves, tool body
Hoses & Fittings
Bottles & Valves
Cart or other CG Bottle Support
Surrounding Area
Fire Protection
Any defective equipment must be replaced,
repaired, or removed from service
Personal Protective Equipment
Helmet
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Must Comply with
ANSI Z87.1
Most equipped with
auto-darken features,
1/10,000 of a
second
OSHA 1926.102
Tables E-1 and E-2
specify minimum
protection levels
Personal Protective Equipment
Gloves
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ANSI Z49.1
Must be flame resistant
Gloves should be in
good shape
Must resist potential
electric shock from
welding unit
Personal Protective Equipment
Apron
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ANSI Z49.1
Produced in
variety of fire
retardant
materials
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Leather
Nomex
Chemically treated
textiles
Compressed Gas Cylinders
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Typical Oxygen cylinder
pressures are around 2600
lbs/in²
Oxy fittings should be kept
clean and free of oil and
grease
Hose colors determine use:
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Red – fuel gas hose
Green – Oxygen
Black – Inert gas
Compressed Gas Cylinders
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Cylinder valves must be protected at
all times
Cylinders should be stored in an
upright and secure position
The tilt and roll method is accepted
practice for movement, never
attempt to hoist with chokers
Valve caps must be secure any time
the cylinder is not in use
When stored, oxygen cylinders
should be separated from other gas
cylinders.
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The required separation is 20’
or
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A five foot high fire wall with an
approved fire-resistance rating
Welding Torch - Cutting Torch
Comparison
Cutting Torch Safety
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Take appropriate
precautions for flooring
surface
Work benches made of steel
or other fire retardant
material is acceptable
Adequate ventilation
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Confined Spaces
Toxic Fumes
Cutting Torch Safety
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Appropriate personal protective
equipment
Control potentially combustible materials
around work area
Fire extinguisher handy at all times
Equipment maintenance
Safe Welding Checklist
Familiarization with all applicable Material
Safety Data Sheets (MSDS)
Surrounding area free of potentially
combustible materials
Leeds should be fully insulated, no kinks
or deformation
Fire extinguisher readily available, fully
charged and functional
Torch tip, valves, and tool body in good
working order
Proper face, hand, and body protection in
use
Hoses and fittings tight and free of wear,
dry rot
Surrounding work areas protected by
welding curtains
Bottles secured and upright whether
stored or in use, cap secured
Adequate ventilation for all processes at
all locations
Bottles free of excessive corrosion, no
dents, collar threads intact, clean fitting
Insure proper grounding of welding
machine
Valves and gauges secured and
operational
Any defective equipment replaced or
repaired prior to the start of work