Lincoln Electric LF-72/74 service manual Operation, GAS Input Work Connection

B-2 OPERATION B-2

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SAFETY PRECAUTIONS

Read this entire section of operating instructions before operating the machine.

WARNING

ELECTRIC SHOCK can kill.

•Unless using cold feed feature, when feeding with the gun trigger, the electrode and drive mechanism are always electrically energized and could remain energized several sec- onds after welding ceases.

•Do not touch electrically live parts or electrodes with your skin or wet clothing.

•Insulate yourself from the work and ground.

•Always wear dry insulating gloves.

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ONLY QUALIFIED PERSONS SHOULD INSTALL, USE OR SERVICE THIS EQUIPMENT. READ AND FOLLOW THE MANUFACTURER’S INSTRUC- TIONS, EMPLOYER’S SAFETY PRACTICES AND MATERIAL SAFETY DATA SHEETS (MSDS) FOR CONSUMABLES.

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READ THIS WARNING, PROTECT YOURSELF & OTHERS.

FUMES AND GASES can be dangerous.

• Keep your head out of fumes.

• Use ventilation or exhaust at the arc, or both, to keep fumes and gases from your breathing zone and gener- al area.

WELDING SPARKS can cause fire or explosion.

•Do not weld near flammable material.

•Do not weld on containers which have held flam- mable material.

ARC RAYS can burn.

The serviceability of a product or structure utilizing the LF-72 wire feeder is and must be the sole respon- sibility of the builder/user. Many variables beyond the control of The Lincoln Electric Company affect the results obtained in using the LF-72 wire feeder. These variables include, but are not limited to, weld- ing procedure, plate chemistry and temperature, weldment design, fabrication methods and service requirements. The available range of the LF-72 wire feeder may not be suitable for all applications, and the builder/user is and must be solely responsible for welding settings.

GRAPHIC SYMBOLS THAT APPEAR ON THIS MACHINE OR IN THIS MANUAL

COLD FEED

POSITIVE OUTPUT

NEGATIVE OUTPUT

PROTECTIVE

GROUND

WARNING OR

CAUTION

DANGEROUS

VOLTAGE

SHOCK

HAZARD

WELDING

FUMES

EXPLOSION

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• Wear eye, ear, and body protection.

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Observe additional guidelines detailed in the beginning of this manual.

LF-72/74

GAS INPUT

WORK CONNECTION