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Welding and Cutting

发布时间:2013-12-04 14:02:49  

Welding and Cutting

?29 CFR 1926 -Subpart J

Objectives

In this course, we will discuss the following:

?OSHA’s minimum requirements for:

–Gas welding and cutting

–Arc welding and cutting

–Fire prevention

–Ventilation and protection

?Safe use, handling, and precautions to take when

welding and cutting

?Hazard identification and abatement methods

Subpart J –Welding and Cutting?1926.350 –Gas welding and cutting?1926.351 –Arc welding and cutting?1926.352 –Fire prevention

?1926.353 –Ventilation and protection in welding, cutting, and heating

?1926.354 –Welding, cutting, and heating in way of preservative coatings

Gas Welding and Cutting1926.350(a)(1)?Compressed gas cylinders must have valve protection caps in place and secured except when in use.

Gas Welding and Cuttingsecured, as on a cradle or pallet.1926.350(a)(2)?Compressed gas cylinders must only be hoisted while ?Cylinders must not be hoisted by magnet, choker sling, or cylinder caps.

Gas Welding and Cutting

on their bottom edges.1926.350(a)(3)?Cylinders shall be moved by tilting or rolling

Gas Welding and Cuttingtransported by powered vehicles.1926.350(a)(4)

?Cylinders must be secured in a vertical position when

Gas Welding and Cuttingcylinders.

?Frozen cylinders must not be:

?Pried loose with bars

under valves or valve

protection caps

?Hit with a tool

?Thawed by boiling water1926.350(a)(5)?Valve protection caps must not be used for lifting

Gas Welding and Cutting?Cylinders must be secured 1926.350(a)(7)

while in use.

?A suitable cylinder truck, chain, or other steadying device must be used to keep cylinders from being knocked over.

Gas Welding and Cutting

cylinders are empty or when moved.1926.350(a)(8)

?Valves must be closed when work is finished,

Gas Welding and Cutting?Cylinders must be secured 1926.350(a)(9)upright except when being hoisted or carried.

Gas Welding and Cuttingcylinders and combustible materials.

?Either a minimum of 20 feet, or1926.350(a)(10)

?Oxygen cylinders must be separated from fuel gas

?A barrier at least 5 feet high having a fire resistance rating of 30 minutes.

Gas Welding and Cuttingflame.1926.350(b)(1)-(4)?Cylinders must not be exposed to sparks, hot slag or

?Cylinders must not become part of an electrical circuit or have electrodes struck

against them.

?Fuel gas cylinders must be

placed with valve end up

when in use.

?Fuel gas cylinders shall

not be taken into confined spaces.

Gas Welding and Cuttingsupports.

?No damaged or 1926.350(c)(1)-(2)?Cylinders must not be used as rollers or

defective cylinder shall be used.

Gas Welding and Cutting1926.350(d)(1)?Before regulators are connected, valve must be

slightly opened and then immediately closed to clear away dust or dirt.

Gas Welding and Cutting1926.350(d)(2)?Where a special wrench is required to close

valve, it must be left in position on the stem.

Gas Welding and Cutting1926.350(d)(2)

Gas Welding and Cutting

?Fuel gas and oxygen hoses must be easily 1926.350(f)(1)

distinguishable from each other by color or sense of touch.

?Oxygen and fuel gas hoses must not be interchangeable.

Gas Welding and Cutting1926.350(f)(2)?When parallel sections of oxygen and fuel gas hoses are taped together, not more than 4″out of 12″shall be covered by tape.

Gas Welding and Cutting?Defective hose must not be used.?Hose subjected to 1926.350(f)(3)-(4)?Hoses must be inspected before use.

flashback, severe

wear or damage

must be tested to

twice the normal working pressure.

Gas Welding and Cutting?When not in use or work is completed:

?Close valve

?Bleed lines of pressure

Gas Welding and Cutting1926.350(f)(7)

?Hoses, cables, and other equipment must be

kept clear of passageways, ladders and stairs.

Gas Welding and Cutting

devices designed for that purpose.1926.350(g)(1)?Torch tip openings must only be cleaned with

Gas Welding and Cutting

1926.350(g)(2)?Torches must be inspected before each use for leaking valves, hose couplings and tip connections.?

Defective torches must not be used.

Gas Welding and Cuttingother flames or hot work.1926.350(g)(3)?Torches must not be lit from matches, cigarette lighters,

?They must be lighted by friction lighters or other approved devices.

Gas Welding and Cutting

maintained in safe working order.

Oxygen regulator exploding1926.350(h)

?Pressure regulators and gauges must be

Gas Welding and Cutting

away from oil and grease.1926.350(i)?Oxygen cylinders and fittings must be kept

Arc Welding and Cutting

arc welding must be used.1926.351(a)(1)?Only manual electrode holders designed for

Arc Welding and Cutting1926.351(a)(2)?Current-carrying parts passing through a manual electrode holder to be held by the user must be

insulated against the maximum voltage.

Arc Welding and Cutting1926.351(b)(2)?Cables must be free of repair or splices for 10 feet from holder unless insulated to equal value of cable.?Worn or exposed cable must be protected by insulation

equal to original value of cable or not used.

Arc Welding and Cuttingcarrying capacity of unit served.1926.351(c)(1)?Ground return cables must have maximum current

Arc Welding and Cutting1926.351(d)(1)?Unattended electrode holders must be made safe by removing electrodes and placed or protected to prevent injury.

Arc Welding and Cutting1926.351(d)(3)?When the welder leaves, stops work, or moves the welding machine, power supply switch must be turned off.

Arc Welding and Cuttingdefective must not be used.1926.351(d)(4)?Arc welding or cutting equipment which is faulty or

Arc Welding and Cutting1926.351(e)?Arc welding/cutting operations shall be shielded or screened off to protect employees in the vicinity from

direct rays and sparks.

Fire Prevention

designated areas free of fire hazards.?Hot work done in areas 1926.352(a)-(b)?To the extent possible, hot work must be performed in

not free of fire hazards

?Precautions taken to

confine heat, sparks,

and slag -cannot

contact flammable

or combustible material.

Fire Prevention1926.352(d)?Fire extinguishing equipment must be readily

available and maintained in readiness for use.

Fire Prevention1926.352(e)?When normal fire prevention precautions are not sufficient, additional personnel must be assigned to

guard against fire during hot work.

Fire Prevention

liquids must be kept closed.1926.352(h)?Drums and containers of flammable or combustible ?Empty containers must be removed from the hot work area.

Ventilation and Protectionin the breathing zone within safe limits.1926.353(a)(1)?Local exhaust ventilation must keep smoke and fumes

?As defined in Subpart D -Occupational Health and

Environmental Controls

Ventilation and Protection

cooling or cleaning.1926.353(a)(6)?Oxygen must not be used for ventilation,

Ventilation and Protection1926.353(b)(1)-(3)?When hot work is performed in a confined space:

?General mechanical or local exhaust must be provided,or?Employees in the space must wear supplied air respirators,and ?An attendant on the

outside must be equipped

and prepared to provide

emergency aid.

Welding in Confined Spaces1926.353(c)(1)

Ventilation and Protectionbe protected by filter lenses.

?Meet the requirements of Subpart E

?1926.102 -Eye and face protection1926.353(d)(1)(ii)

?Employees exposed to welding arcs or sparks must

Ventilation and Protection?Workers exposed to 1926.353(d)(1)(iii)radiation must be suitably

protected to prevent burns

by ultraviolet rays.

?Welding helmets and hand

shields must be free of leaks

and openings.

Ventilation and Protection1926.353(e)(2)?Employees performing any type of welding, cutting or heating must be protected by suitable eye protective equipment.

?In accordance with

requirements of Subpart E

Welding, Cutting and Heating?Before hot work is commenced 1926.354(a)-(b)

on any surface covered by a

preservative coating:

?Test must be made by

competent person to

determine flammability.

?If flammable, must be stripped from area to be

heated to prevent ignition.

Future of Welding?Laser welding is one of the newest processes.?Even low power lasers can be hazardous to a person’s eyesight.

Summary

During this course, we discussed:?OSHA’s minimum requirements for:

–Gas welding and cutting

–Arc welding and cutting

–Fire prevention

–Ventilation and protection

?Safe use, handling, and precaution to take when welding and cutting

?Hazard identification and abatement methods

Thank You For Attending!

Final Questions?

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