10.G Gas Metal Arc Welding.
10.G.01 Chlorinated solvents must be kept at least 200 ft (61 m) away from the exposed arc, unless shielded. Surfaces prepared with chlorinated solvents must be dry before welding is permitted on such surfaces.
10.G.02 Persons less than 35 ft (10.7 m) from the arc not protected from the arc by screening must be protected by filter lenses. When two or more welders are exposed to each other's arc, filter lens goggles must be worn under welding helmets. Hand shields must be used to protect the welders against flashes and radiant energy when either the helmet is lifted or the shield is removed.
10.G.03 Welders and other persons who are exposed to radiation must be protected so that the skin is covered to prevent burns and other damage by UV rays. Welding helmets and hand shields must be free of leaks, cracks, openings, and highly reflective surfaces.
10.G.04 When gas metal arc welding is performed on stainless steel, chrome alloy steel, or chrome-coated metal, personnel must be protected against dangerous concentrations of nitrogen dioxide and other air contaminants such as chromium (VI), by means of an approved local exhaust ventilation system. The system must be capable of reducing and maintaining personal exposures to within permissible limits, or by means of other effective work practice and engineering controls such as the use of an argon-rich (> 75% argon) shielding gas for use in gas metal arc welding (GMAW) or flux cored arc welding (FCAW) operations. Wherever engineering and work practice controls are not sufficient to reduce employee exposures below permissible limits, the employer must use them to reduce employee exposures to the lowest levels achievable, and must supplement such methods by the use of respiratory protection that complies with the requirements of this Section and Section 05.
10.H Plasma Cutting.
10.H.01 Plasma arc cutting equipment must be installed, maintained and operated in accordance with the NEC and manufacturer's instructions.
10.H.02 All cables and torch leads must be inspected before each use. Any damaged cables and torch leads must be replaced before use.
10.H.03 All consumables (nozzles, electrodes, etc.) must be verified for proper installation before each use.
10.H.04 All torches used in plasma cutting must contain a trigger safety device to prevent accidental contact.
10.I Thermite Welding.
10.I.01 The mold for a thermite weld must be dried thoroughly and provided cover before the charge is ignited to prevent spray back during the thermite welding reaction.
10.I.02 Storage of Thermite Welding Supplies.
- Bulk storage of thermite welding materials must be maintained in a detached shed or building at least 50 ft (15 m) from the welding area.
- Bulk storage areas for thermite welding materials must be maintained dry and locked.
- Storage containers for the starting material must be closed tightly immediately after each use.
10.I.03 Thermite welding molds must not be removed until sufficient cooling has taken place as stated in the manufacturer's literature.
10.I.04 Smoking must not be allowed in areas where thermite welding material is being used or stored.
Knowledge Check Choose the best answer for the question.
10-8. If you are within 35 ft (10.7 m) from the gas metal arc welder and not protected from the arc by screening, how are you going to protect yourself?
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