OM-223 Page 3
OVERUSE can cause OVERHEATED
EQUIPMENT.
1. Allow cooling period.
2. Reduce current or reduce duty cycle before
starting to weld again.
3. Follow rated duty cycle.
STATIC ELECTRICITY can damage
parts on circuit boards.
1. Put on grounded wrist strap BEFORE handling
boards or parts.
2. Use proper static-proof bags and boxes to store,
move, or ship PC boards.
SIGNIFICANT DC VOLTAGE exists after
removal of input power on inverters.
1. Turn Off inverter, disconnect input power, and
discharge input capacitors according to
instructions in Maintenance Section before
touching any parts.
BUILDUP OF SHIELDING GAS can harm
health or kill.
1. Shut off shielding gas supply when not in use.
5-4. Principal Safety Standards
Safety in Welding and Cutting
, ANSI Standard Z49.1, from American
Welding Society, 550 N.W. LeJeune Rd, Miami FL 33126
Safety and Health Standards
, OSHA 29 CFR 1910, from
Superintendent of Documents, U.S. Government Printing Office,
Washington, D.C. 20402.
Recommended Safe Practices for the Preparation for Welding and
Cutting of Containers That Have Held Hazardous Substances
,
American Welding Society Standard AWS F4.1, from American
Welding Society, 550 N.W. LeJeune Rd, Miami, FL 33126
National Electrical Code
, NFPA Standard 70, from National Fire
Protection Association, Batterymarch Park, Quincy, MA 02269.
Safe Handling of Compressed Gases in Cylinders
, CGA Pamphlet
P-1, from Compressed Gas Association, 1235 Jefferson Davis
Highway, Suite 501, Arlington, VA 22202.
Code for Safety in Welding and Cutting
, CSA Standard W117.2, from
Canadian Standards Association, Standards Sales, 178 Rexdale
Boulevard, Rexdale, Ontario, Canada M9W 1R3.
S
afe Practices For Occupation And Educational Eye And Face
Protection
, ANSI Standard Z87.1, from American National Standards
Institute, 1430 Broadway, New York, NY 10018.
Cutting And Welding Processes
, NFPA Standard 51B, from National
Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
5-5. EMF Information
Considerations About Welding And The Effects Of Low Frequency
Electric And Magnetic Fields
The following is a quotation from the General Conclusions Section of
the U.S. Congress, Office of Technology Assessment,
Biological
Effects of Power Frequency Electric & Magnetic Fields
−
Background
Paper
, OTA-BP-E-53 (Washington, DC: U.S. Government Printing
Office, May 1989): “. . . there is now a very large volume of scientific
findings based on experiments at the cellular level and from studies
with animals and people which clearly establish that low frequency
magnetic fields can interact with, and produce changes in, biological
systems. While most of this work is of very high quality, the results are
complex. Current scientific understanding does not yet allow us to
interpret the evidence in a single coherent framework. Even more
frustrating, it does not yet allow us to draw definite conclusions about
questions of possible risk or to offer clear science-based advice on
strategies to minimize or avoid potential risks.”
To reduce magnetic fields in the workplace, use the following
procedures:
1. Keep cables close together by twisting or taping them.
2. Arrange cables to one side and away from the operator.
3. Do not coil or drape cables around the body.
4. Keep welding power source and cables as far away as
practical.
5. Connect work clamp to workpiece as close to the weld as
possible.
About Pacemakers:
The above procedures are also recommended for pacemaker
wearers. Consult your doctor for complete information.
