Lincoln Electric SVM154-A service manual Safety, Fumes and Gases

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

ii			SAFETY				ii
		ELECTRIC SHOCK can				ARC RAYS can burn.
		kill.				4.a. Use a shield with the proper filter and cover
						plates to protect your eyes from sparks and
		3.a. The electrode and work (or ground) circuits
						the rays of the arc when welding or observing
		are electrically “hot” when the welder is on.
						open arc welding. Headshield and filter lens
		Do not touch these “hot” parts with your bare
						should conform to ANSI Z87. I standards.
		skin or wet clothing. Wear dry, hole-free
		gloves to insulate hands.		4.b. Use suitable clothing made from durable flame-resistant
3.b. Insulate yourself from work and ground using dry insulation.					material to protect your skin and that of your helpers from
					the arc rays.
	Make certain the insulation is large enough to cover your full
	area of physical contact with work and ground.			4.c. Protect other nearby personnel with suitable, non-flammable
					screening and/or warn them not to watch the arc nor expose
	In addition to the normal safety precautions, if welding				themselves to the arc rays or to hot spatter or metal.
	must be performed under electrically hazardous
	conditions (in damp locations or while wearing wet
						FUMES AND GASES
	clothing; on metal structures such as floors, gratings or
	scaffolds; when in cramped positions such as sitting,					can be dangerous.
	kneeling or lying, if there is a high risk of unavoidable or
	accidental contact with the workpiece or ground) use					5.a. Welding may produce fumes and gases
	the following equipment:					hazardous to health. Avoid breathing these
	• Semiautomatic DC Constant Voltage (Wire) Welder.					fumes and gases.When welding, keep
	• DC Manual (Stick) Welder.					your head out of the fume. Use enough
	• AC Welder with Reduced Voltage Control.					ventilation and/or exhaust at the arc to keep
					fumes and gases away from the breathing zone. When
3.c. In semiautomatic or automatic wire welding, the electrode,					welding with electrodes which require special
	electrode reel, welding head, nozzle or semiautomatic				ventilation such as stainless or hard facing (see
	welding gun are also electrically “hot”.				instructions on container or MSDS) or on lead or
					cadmium plated steel and other metals or coatings
3.d. Always be sure the work cable makes a good electrical					which produce highly toxic fumes, keep exposure as
	connection with the metal being welded. The connection				low as possible and below Threshold Limit Values (TLV)
	should be as close as possible to the area being welded.				using local exhaust or mechanical ventilation. In
					confined spaces or in some circumstances, outdoors, a
3.e. Ground the work or metal to be welded to a good electrical					respirator may be required. Additional precautions are
	(earth) ground.				also required when welding on galvanized steel.
3.f.	Maintain the electrode holder, work clamp, welding cable and			5.b. Do not weld in locations near chlorinated hydrocarbon vapors
	welding machine in good, safe operating condition. Replace				coming from degreasing, cleaning or spraying operations.
	damaged insulation.			The heat and rays of the arc can react with solvent vapors to
				form phosgene, a highly toxic gas, and other irritating
3.g. Never dip the electrode in water for cooling.				products.
3.h. Never simultaneously touch electrically “hot” parts of				5.c. Shielding gases used for arc welding can displace air and
	electrode holders connected to two welders because voltage				cause injury or death. Always use enough ventilation,
	between the two can be the total of the open circuit voltage				especially in confined areas, to insure breathing air is safe.
	of both welders.			5.d. Read and understand the manufacturer’s instructions for this
3.i. When working above floor level, use a safety belt to protect					equipment and the consumables to be used, including the
	yourself from a fall should you get a shock.				material safety data sheet (MSDS) and follow your
					employer’s safety practices. MSDS forms are available from
3.j.	Also see Items 6.c. and 8.				your	welding distributor or from the manufacturer.

5.e. Also see item 1.b.

Mar ‘95