ARC Inverter Power Sources User Manual download pdf (Page 4)

METHODS OF REDUCING EMISSIONS

Mains supply

Welding equipment should be connected to the mains supply according to the manufacturers recommendations. If interference

occurs, it may be necessary to take additional precautions such as filtering of the mains supply. Consideration should be given

to shielding the supply cable of permanently installed welding equipment, in metallic conduit or equivalent. Shielding should be

electrically continuous throughout its length. The shielding should be connected to the welding power source so that good

electrical contact is maintained between the conduit and the welding power source enclosure.

Maintenance of the welding equipment

The welding equipment should be routinely maintained according to the manufacturers recommendations. All access and

service doors and covers should be closed and properly fastened when the welding equipment is in operation. The welding

equipment should not be modified in any way except for those changes and adjustment covered in the manufacturers

instructions. In particular, the spark gaps of arc striking and stabilizing devices should be adjusted and maintained according to

the manufacturers recommendations.

Welding cables

The welding cables should be kept as short as possible and should be positioned close together, running at or close to the floor

level.

SECTION 1 --- SAFETY

1.1 INTRODUCTION

Arc welding processes as developed after many years of welding experience can be used with a high degree of safety provided

that proper care and attention is given to common sense practices and to manufacturer’s recommended methods.

It is therefore imperative that management and safety personnel make sure that all personnel who will operate or maintain the

welding equipment be given the opportunity to read this information.

1.2 GENERAL PRECAUTIONS

1.2.1 Prevention of burns

Sparks, slag, hot metal and radiations produced by the welding arc can be seriously damaging to the eyes and skin. As the

operator or any other person comes close to the welding area, the level of exposure increases rapidly. Proper protective clothing

and equipment must be worn by the operator and any other persons working in the vicinity of the arc. Gauntlet gloves designed

for use in welding, safety shoes, and a hat are required. Flame retardant clothing which covers all exposed areas and cuffless

trousers to prevent entry of sparks and slag are recommended. Proper safety goggles or glasses with side shields of the

appropriate welding lens shade MUST be worn to protect the operator’s eyes from radiant energy and flying sparks or hot metal.

1.2.2 Fire prevention

Since electric welding arc produces hot metal, sparks, and slag, precautions must be taken to prevent fire and/or explosions.

Make sure that appropriate fire extinguishing equipment is available in the immediate welding area.

All combustible materials must be removed from the immediate welding area to a distance of at least 10 meters(35 feets) away.

Never arc weld empty containers which have held toxic or potentially explosive materials. Those containers must be thoroughly

cleaned prior to welding.

Never arc weld in an atmosphere which contains heavy concentrations of dust, flammable gas, or combustible liquid

vapors(such as gasoline).

After each welding operation make sure to let welded material to cool down before touching it or putting it in contact with

combustible or flammable materials.

1.2.3 Toxic Fumes

Proper precautions must be exercised to prevent the exposure of the operator or others in the surrounding area to possible toxic

fumes which may be generated during electric are welding.

Certain chlorinated solvents will decompose under ultraviolet radiations to form phosgene gas. Care must be exercised to avoid

the use of these solvents on materials being weld with electric arc welding equipment. Containers of these solvents and other

degreasing agents must be removed from the immediate area near the welding arc.

Metals coated with or containing significant amounts of lead, cadmium, zinc, mercury, and beryllium can produce harmful

concentration of toxic fumes when subject to electric arc welding operations. Adequate local exhaust ventilation must be used or

the operator must be wearing special equipment to guarantee a supply of fresh air as a respirator or air supplied helmet.

Do not weld metals coated with materials which emit toxic fumes unless 1) the coating is removed prior to welding, 2) the area is

adequately ventilated, or 3) the operator is supplied with fresh-air breathing equipment.

1.2.4 Radiation

Ultra-violet radiations created by the arc may be harmful to the eyes and burn the skin; it is therefore imperative to wear

protective clothing and helmet.

Contact lenses should not be used as the intense heat coming from the arc may cause them to stick to the cornea.

The mask used during welding should be equipped with grade DIN 10 safety lenses at least and they should immediately be

replaced whenever damaged or broken.

Since the arc may damage the eyes it is considered dangerous up to a distance of 15 meters (50 feets) and it should never be

locked at with the naked eye.

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ARC Inverter Power Sources User Manual Page 4

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