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8/11/2019 Quality Safety Pro

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Welding and Cutting

Part 1926 Subpart J


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1926.350Gas welding and cutting

Transporting, moving, and storingcompressed gas cylinders Valve protection caps shall be in place and

secured

When cylinders are hoisted, they shall besecured on a cradle, slingboard, or pallet.They shall not be hoisted or transported by

means of magnets or choker slings


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Transporting, moving, and storingcompressed gas cylinders Cylinders shall be moved by tilting and

rolling them on their bottom edges. Theyshall not be intentionally dropped, struck,

or permitted to strike each other violently

When cylinders are transported by

powered vehicles, they shall be secured ina vertical position


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Transporting, moving, and storingcompressed gas cylinders Valve protection caps shall not be used for

lifting cylinders from one vertical position toanother

Bars shall not be used under valves orvalve protection caps to pry cylinders loosewhen frozen

Warm, not boiling, water shall be used tothaw cylinders loose


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Transporting, moving, and storingcompressed gas cylinders ) 6) Unless cylinders are firmly secured on a

special carrier intended for this purpose,regulators shall be removed and valve

protection caps put in place beforecylinders are moved


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Transporting, moving, and storingcompressed gas cylinders ) A suitable cylinder truck, chain, or other

steadying device shall be used to keepcylinders from being knocked over while in

use

When work is finished, when cylinders areempty, or when cylinders are moved at anytime, the cylinder valve shall be closed 6)


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Transporting, moving, and storingcompressed gas cylinders ) Compressed gas cylinders shall be

secured in an upright position at alltimes except, if necessary, for short

periods of time while cylinders areactually being hoisted or carried


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Transporting, moving, and storingcompressed gas cylinders ) Oxygen cylinders in storage shall be

separated from fuel-gas cylinders orcombustible materials (especially oil or

grease), a minimum distance of 20 feet(6.1 m) or by a noncombustible barrier atleast 5 feet (1.5 m) high having a fire-resistance rating of at least one-half hour.


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Transporting, moving, and storingcompressed gas cylinders ) Inside of buildings, cylinders shall be

stored in a well-protected, well-ventilated,dry location, at least 20 feet (6.1 m) from

highly combustible materials such as oil orexcelsior Cylinders should be stored in definitely

assigned places away from elevators,stairs, or gangways


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Transporting, moving, and storingcompressed gas cylinders ) Assigned storage places shall be located

where cylinders will not be knocked over ordamaged by passing or falling objects, or

subject to tampering by unauthorizedpersons

Cylinders shall not be kept in unventilatedenclosures such as lockers and cupboards


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Placing Cylinders Cylinders shall be kept far enough away

from the actual welding or cutting operationso that sparks, hot slag, or flame will notreach them

When this is impractical, fire resistantshields shall be provided.


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Placing Cylinders Fuel gas cylinders shall be placed with

valve end up whenever they are in use

They shall not be placed in a locationwhere they would be subject to openflame, hot metal, or other sources ofartificial heat


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Treatment of cylinders Cylinders, whether full or empty, shall not

be used as rollers or supports

No person other than the gas supplier shallattempt to mix gases in a cylinder

No damaged or defective cylinder shall be

used d)


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Use of fuel gas Before a regulator to a cylinder valve is

connected, the valve shall be openedslightly and closed immediately

This action is generally termed "cracking"and is intended to clear the valve of dust ordirt that might otherwise enter the regulator(d)(2)


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Use of fuel gas The cylinder valve shall always be opened

slowly to prevent damage to the regulator

For quick closing, valves on fuel gascylinders shall not be opened more than 11/2 turns


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Use of fuel gas When a special wrench is required, it shall

be left in position on the stem of the valvewhile the cylinder is in use so that the fuelgas flow can be shut off quickly in case ofan emergency

In the case of manifolded or coupledcylinders, at least one such wrench shallalways be available for immediate use


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Use of fuel gas Before a regulator is removed from a

cylinder valve, the cylinder valve shallalways be closed and the gas releasedfrom the regulator

If a leak should develop at a fuse plug orother safety device, the cylinder shall beremoved from the work area


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Hose Fuel gas hose and oxygen hose shall be

easily distinguishable from each other The contrast may be made by different

colors or by surface characteristics readily

distinguishable by the sense of touch Oxygen and fuel gas hoses shall not be

interchangeable


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Hose When parallel sections of oxygen and fuel

gas hose are taped together, not morethan 4 inches out of 12 inches shall becovered by tape


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Hose All hose in use, carrying acetylene,

oxygen, natural or manufactured fuel gas,or any gas or substance which may igniteor enter into combustion, or be in any wayharmful to employees, shall be inspectedat the beginning of each working shift

Defective hose shall be removed fromservice


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Hose Hose couplings shall be of the type that

cannot be unlocked or disconnected bymeans of a straight pull without rotarymotion

Boxes used for the storage of gas hoseshall be ventilated Hoses, cables, and other equipment shall

be kept clear of passageways, ladders andstairs


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Torches Clogged torch tip openings shall be

cleaned with suitable cleaning wires, drills,or other devices designed for such purpose

Torches in use shall be inspected at thebeginning of each working shift for leakingshutoff valves, hose couplings, and tipconnections. Defective torches shall not beused


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Torches Torches shall be lighted by friction lighters

or other approved devices, and not bymatches or from hot work


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Oil and grease hazards Oxygen cylinders and fittings shall be kept

away from oil or grease

Cylinders, cylinder caps and valves,

couplings, regulators, hose, and apparatusshall be kept free from oil or greasysubstances and shall not be handled withoily hands or gloves


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1926.351 Arc welding and cutting

Manual electrode holders Any current-carrying parts passing through

the portion of the holder which the arcwelder or cutter grips in his hand, and theouter surfaces of the jaws of the holder,shall be fully insulated against themaximum voltage encountered toground (b)


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Welding cables and connectors. All arc welding and cutting cables shall be

of the completely insulated, flexible type,capable of handling the maximum currentrequirements of the work in progress,taking into account the duty cycle underwhich the arc welder or cutter is working


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Welding cables and connectors. Only cable free from repair or splices for a

minimum distance of 10 feet from the cableend to which the electrode holder isconnected shall be used

Except that cables with standard insulatedconnectors or with splices whose insulatingquality is equal to that of the cable arepermitted )


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Welding cables and connectors When it becomes necessary to connect or

splice lengths of cable one to another,substantial insulated connectors of acapacity

If connections are effected by means ofcable lugs, they shall be securely fastenedtogether to give good electrical contact

Exposed metal parts of the lugs shall becompletely insulated


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Ground returns and machine grounding A ground return cable shall have a safe

current carrying capacity equal to orexceeding the specified maximum outputcapacity of the arc welding or cutting unitwhich it services

When a single ground return cableservices more than one unit, its safecurrent-carrying capacity


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Ground returns and machine grounding Pipelines containing gases or flammable

liquids, or conduits containing electricalcircuits, shall not be used as a groundreturn (c

)(3) When a structure or pipeline is employed

as a ground return circuit, it shall bedetermined that the required electrical

contact exists at all joints (c)(4)


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Ground returns and machine grounding All ground connections shall be inspected

to ensure that they are mechanically strongand electrically adequate for the requiredcurrent


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Operation instructions Employers shall instruct employees in the

safe means of arc welding and cutting

When electrode holders are to be left

unattended, the electrodes shall beremoved and the holders shall be soplaced or protected that they cannot makeelectrical contact with employees or

conducting objects


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Operating instructions Hot electrode holders shall not be dipped

in water

To do so may expose the arc welder or

cutter to electric shock


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Operating instructions When the arc welder or cutter has

occasion to leave his work or to stop workfor any appreciable length of time, or whenthe arc welding or cutting machine is to bemoved, the power supply switch to theequipment shall be opened

Any faulty or defective equipment shall be

reported to the supervisor


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Shielding Whenever practicable, all arc welding

and cutting operations shall be shieldedby noncombustible or flameproof screens

which will protect employees and otherpersons working in the vicinity from thedirect rays of the arc


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1926.352Fire Prevention

When practical, objects to be welded,cut, or heated shall be moved to adesignated safe location

If the objects to be welded, cut, or

heated cannot be readily moved, allmovable fire hazards in the vicinity shallbe taken to a safe place, or otherwise

protected


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No welding, cutting, or heating shall bedone where the application of

flammable paints, or the presence ofother flammable compounds, or heavydust concentrations creates a hazard


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1926 352


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If normal fire prevention precautions arenot sufficient, additional personnel shall

be assigned to guard against fire whilethe actual welding, cutting, or heatingoperation is being performed, and for a

sufficient period of time after completionof the work to ensure that no possibilityof fire exists (f)

1926 352


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For the elimination of possible fire inenclosed spaces as a result of gas

escaping through leaking or improperlyclosed torch valves, the gas supply to thetorch shall be positively shut off at somepoint outside the enclosed space whenever

the torch is not to be used or whenever thetorch is left unattended for a substantialperiod of time, such as during the lunchperiod

1926 352


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Overnight and at the change of shifts,the torch and hose shall be removed

from the confined space

Open end fuel gas and oxygen hoses

shall be immediately removed fromenclosed spaces when they aredisconnected from the torch or other

gas-consuming device

1926 353


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1926.353 Ventilation & Protection

Mechanical Ventilation Mechanical ventilation shall consist of

either general mechanical ventilationsystems or local exhaust systems (a

)(2)

General mechanical ventilation shall be ofsufficient capacity and so arranged as toproduce the number of air changesnecessary to maintain welding fumes and

smoke within safe limits

1926 353


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Mechanical Ventilation Local exhaust ventilation shall consist of

freely movable hoods intended to beplaced by the welder or burner as close aspracticable to the work

This system shall be of sufficient capacityand so arranged as to remove fumes andsmoke at the source and keep theconcentration of them in the breathing

zone within safe limits

1926 353


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Mechanical Ventilation Contaminated air exhausted from a

working space shall be discharged into theopen air or otherwise clear of the source ofintake air (5)

All air replacing that withdrawn shall beclean and respirable

1926 353


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Mechanical Ventilation Oxygen shall not be used for ventilation

purposes, comfort cooling, blowing dustfrom clothing, or for cleaning the workarea (b)

1926 353


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Welding, cutting, and heating in confinedspaces Either general mechanical or local exhaust

ventilation shall be provided wheneverwelding, cutting, or heating is performed ina confined space

1926 353


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Welding, cutting, and heating in confinedspaces When sufficient ventilation cannot be

obtained without blocking the means ofaccess, employees in the confined spaceshall be protected by air line respirators

An employee on the outside of such aconfined space shall be assigned to maintaincommunication with those working within it

and to aid them in an emergency

1926 353


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Welding, cutting, and heating in confinedspaces "Lifelines.

Where a welder must enter a confinedspace through a manhole or other smallopening, means shall be provided forquickly removing him in case of emergency

1926 353


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Welding, cutting, and heating in confinedspaces An attendant with a pre-planned rescue

procedure shall be stationed outside toobserve the welder at all times and becapable of putting rescue operations intoeffect (c)

1926 353


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Welding, cutting, or heating of metals oftoxic significance (c)(1) Welding, cutting, or heating in any

enclosed spaces involving the metalsspecified in this subparagraph shall beperformed with either general mechanicalor local exhaust ventilation ) 1) i)

1926 353


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Welding, cutting, or heating of metals oftoxic significance (c)(1) Zinc-bearing base or filler metals or metals

coated with zinc-bearing materials Lead base metals

Cadmium-bearing filler materials Chromium-bearing metals or metals coated

with chromium-bearing materials c) 2)

1926 353


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Welding, cutting, or heating of metals oftoxic significance (c)( Metals containing lead, other than as an

impurity, or metals coated with lead-bearing materials (

c)(2)(ii) Cadmium-bearing or cadmium-coated

base metals (c)(2)(iii)

1926 353


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Welding, cutting, or heating of metals oftoxic significance (c)( Metals coated with mercury-bearing metals

Beryllium-containing base or filler metals.

Because of its high toxicity, work involvingberyllium shall be done with both localexhaust ventilation and air line respirators

1926 353


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Welding, cutting, or heating of metals oftoxic significance ( Employees performing such operations in

the open air shall be protected by filter-typerespirators

Except that employees performing suchoperations on beryllium-containing base orfiller metals shall be protected by air linerespirators


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1926 353


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Inert-gas metal-arc welding Since the inert-gas metal-arc welding

process involves the production of ultra-violet radiation of intensities of 5 to 30 timesthat produced during shielded metal-arcwelding, the decomposition of chlorinated

solvents by ultraviolet rays, and theliberation of toxic fumes and gases,employees shall not be permitted to engagein, or be exposed to the process until special

precautions have been taken

1926 353


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Inert-gas metal-arc welding The use of chlorinated solvents shall be

kept at least 200 feet, unless shielded,from the exposed arc, and surfacesprepared with chlorinated solvents shall bethoroughly dry before welding is permittedon such surfaces

1926 353


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Inert-gas metal-arc welding Employees in the area not protected from the

arc by screening shall be protected by filterlenses

When two or more welders are exposed toeach other's arc, filter lens goggles of a

suitable type Hand shields to protect the welder against

flashes and radiant energy shall be usedwhen either the helmet is lifted or the shield isremoved

1926 353


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Inert-gas metal-arc welding Welders and other employees who are

exposed to radiation shall be suitablyprotected so that the skin is coveredcompletely to prevent burns and otherdamage by ultraviolet rays

Welding helmets and hand shields shall befree of leaks and openings, and free of highlyreflective surfaces


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1926 353


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General welding, cutting and heating Welding, cutting, and heating, not involving

the previous materials, may normally be donewithout mechanical ventilation or respiratoryprotective equipment, but where, because ofunusual physical or atmospheric conditions,an unsafe accumulation of contaminantsexists, suitable mechanical ventilation orrespiratory protective equipment shall beprovided

1926 353


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General welding, cutting and heating Employees performing any type of welding,

cutting, or heating shall be protected bysuitable eye protective equipment

1926 354


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1926.354Preservative Coatings

Before welding, cutting, or heating iscommenced on any surface covered by a

preservative coating whose flammability isnot known, a test shall be made by acompetent person to determine itsflammability

Preservative coatings shall be considered tobe highly flammable when scrapings burnwith extreme rapidity (b)

1926 354


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Precautions shall be taken to prevent ignitionof highly flammable hardened preservative

coatings

When coatings are determined to be highlyflammable, they shall be stripped from thearea to be heated to prevent ignition c)

1926 354


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Protection against toxic preservativecoatings c) 1) In enclosed spaces, all surfaces covered with

toxic preservatives shall be stripped of alltoxic coatings for a distance of at least 4inches from the area of heat application, orthe employees shall be protected by air linerespirators )(2)

In the open air, employees shall be protected

by a respirator

1926 354


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The preservative coatings shall be removeda sufficient distance from the area to be

heated to ensure that the temperature of theunstripped metal will not be appreciablyraised

Artificial cooling of the metal surroundingthe heating area may be used to limit thesize of the area required to be cleaned

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