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• Do not weld in an area until it is checked for adequate ventilation as described in ANSI
standard #Z49.1. If ventilation is not adequate to exchange all fumes and gasses generated
during the welding process with fresh air, do not weld unless you (the welder) and all
bystanders are wearing air-supplied respirators.
• Do not heat metals coated with, or that contain, materials that produce toxic fumes (such as
galvanized steel), unless the coating is removed. Make certain the area is well ventilated, and
the operator and all bystanders are wearing air-supplied respirators.
• Do not weld, cut, or heat lead, zinc, cadmium, mercury, beryllium, or similar metals without
seeking professional advice and inspection of the ventilation of the welding area. These
metals produce EXTREMELY TOXIC fumes that can cause discomfort, illness, and death.
• Do not weld or cut in areas that are near chlorinated solvents. Vapors from chlorinated
hydrocarbons, such as trichloroethylene and perchloroethylene, can be decomposed by the
heat of an electric arc or its ultraviolet radiation. These actions can cause PHOSGENE, a
HIGHLY TOXIC gas to form, along with other lung and eye-irritating gasses. Do not weld or
cut where these solvent vapors can be drawn into the work area or where the ultraviolet
radiation can penetrate to areas containing even very small amounts of these vapors.
• Do not weld in a confined area unless it is being ventilated or the operator (and anyone else
in the area) is wearing an air-supplied respirator.
• Stop welding if you develop momentary eye, nose, or throat irritation as this indicates
inadequate ventilation. Stop work and take necessary steps to improve ventilation in the
welding area. Do not resume welding if physical discomfort persists.
ADDITIONAL SAFETY INFORMATION
For additional information concerning welding safety, refer to the following standards and comply with
them as applicable.
• ANSI Standard Z49.1 — SAFETY IN WELDING AND CUTTING — obtainable from the American
Welding Society, 550 NW Le Jeune Road, Miami, FL 33126 Telephone (800) 443-9353, Fax (305)
443-7559 - www.amweld.org or www.aws.org
• ANSI Standard Z87.1 — SAFE PRACTICE FOR OCCUPATION AND EDUCATIONAL EYE AND
FACE PROTECTION — obtainable from the American National Standards Institute, 11 West 42nd
St., New York, NY 10036 Telephone (212) 642-4900, Fax (212) 398-0023 - www.ansi.org
• NFPA Standard 51B — CUTTING AND WELDING PROCESS — obtainable from the National Fire
Protection Association, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101 Telephone
(617) 770-3000, Fax (617) 770-0700 - www.nfpa.org
• OSHA Standard 29 CFR, Part 1910, Subpart Q., WELDING, CUTTING AND BRAZING —
obtainable from your state OSHA office or U. S. Dept. of Labor OSHA, Office of Public Affairs, Room
N3647, 200 Constitution Ave. NW Washhington, DC 20210 - www.osha.gov
• CSA Standard W117.2 — Code for SAFETY IN WELDING AND CUTTING. — obtainable from
Canadian Standards Association, 178 Rexdale Blvd. Etobicoke, Ontario M9W 1R3 - www.csa.ca
• American Welding Society Standard A6.0. WELDING AND CUTTING CONTAINERS WHICH HAVE
HELD COMBUSTIBLES. — obtainable from the American Welding Society, 550 NW Le Jeune Road,
Miami, FL 33126 Telephone (800) 443-9353, Fax (305) 443-7559 - www.amweld.org or www.aws.org
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