Document 4JeGbRR52d4d0d0VaZkM0Z4Ea

Inaustnai Hygiene digest June, 1965 PHYSICAL ASPECTS OF THE ENVIRONMENT 582 Survey of Wsiding Processes. J. A. Lueey. Ann. Occ. Hyg. (London) T_, 203 (Sept. 1964) Welding processes ar* categorized into two group*. In the first welding is accomplishee usng heat and pressure, whereas only heat is required in the second. The first group includes forge, friction, pressure gas, resistance, stud, and induction welding. Group 2 includes oxy. fuel gas, arcs of many different types. Electroslag, Thermit, and electron beam. Also included are cutting and gouging processes, which arc likewise categorised as those using (1) oxy.fuel gas and powder; and (2) air/ carbon arc, plasma, oxy.arc, metal arc with flux.coated electrode, and gas*shielded metal arcs. The hazards associated with welding ar* indicated in general terms * J. Occ. Med. Absts 583 Electron Ream Welding. A.F. Taylor. Ann. Occ. Hyg. (London) 2> 24*1 (Sept. 1964). Electron beam welding utilises fast.moving electrons a* a source of heat. This process is possible only with pressure below 10*3mm.Hg. The apparatus inciudes:(l) The electron beam gun and power supply, (2) a vacuum vessel and pumping equipment, and (3) a welding manipulator inside the vessel. With energies in excess of 10$ watts/tq.cm. the beam will fuse metals in a few microseconds. The hazards associated with this type of welding include those common to other welding processes plus x.rays, against which protection is needed. There is probably little hazard attendant to the use of the low.voltage systems, but high.voltage systems --that is. those utilising potentials over 100 KV -- should be earefully monitored for hazards. . J. Occ. Med. Absts 584 Health Hazards in the Welding and Cutting of Paint.Primed Steel. J. Steel. Ann. 6cc. kyg. (London) V, 247 (Sept. 1964|. The thermal decomposition products of the following two groups of compounds arc considered: (1) Pigments including aluminum, cadmium, chromium, iron, lead, magnesium, titanium, and zinc; and (2) primer media including acrylic, cresol.formaldehyde, epoxy, phenol.formaldehyde, polystyrene, polyurethane, polyvmyl.butyral, and polyvinyl chloride. The decomposition products of the latter include carbon monoxide, ammonia, nitrogen dioxide, and organic aldehydes. Typical concentrations of these contaminants in work areas are given and the need for adequate ventilation is stressed. - - J. Occ. Med. Absts 585 The Design of a Medical Laser Laboratory. A Planned Structure to Reduce the Occupational Hazard* of Laser fiasaarch. L. Goldman and P Hornby. Arch, fcnvironmontal HealtS 10, 493-497 (March. 1965). la the rapid development of laser technology, protection of personnel must not be forgotten. Much more data ar* needed, on the nazards of the immediate effects of high er.erg. lasers as well as the later effects of exposure to all forms of laser radiatton. However, our present knowledge, particular emphasis should be placed an adequate shielding of eyes and the skin from laser radiation. This emphasis should not be to the exclusion of protection from the ancillary units of laser systems. Authors' surnmarv 01 132 2671 19