Conclusions
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1.
The laser-arc method of thermal hardening makes it possible to obtain hardened layers 2–3.5 thicker than in laser hardening with maintenance of a high microhardenss of 700–740 H (surface hardness 56–62 HRC).
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3.
Laser-arc treatment makes it possible to obtain hardened layers 4–6 mm wide and up to 1.0 mm deep with treatment rates up to 10 mm/sec and 3–4 mm wide and 0.4–0.6 mm deep with a rate of movement of the laser beam of 20–30 mm/sec.
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3.
An increase in arc length from 2 to 5 mm has practically no influence on the depth, width, and geometry of the laser action zone.
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5.
Defocusing of the laser beam (dL=2.0–4.0) with an increase in the rate of laser-arc treatment above 3.6 mm/sec is undesirable since in this case a high level of hardness is not obtained and localization of the beam is poorer.
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Literature cited
K. G. Rubin and Yu. N. Seleznev, “The use of coatings in laser treatment,” in: The Electrical Industry. Series: Electric Heating [in Russian], Vol. 8, No. 258 (1984), pp. 1–3.
Y. Arata, “Basic characteristics of laser output high energy density heat sources,” in: International Laser Processing Conference, Anaheim, California, No. 16-17 (1981), pp. 14–29.
T. P. Diebold and C. E. Albright, “Laser — GTA welding of aluminum alloy 5052,” Weld. J.,63, No. 6, 18–24 (1984).
Additional information
All-Union Scientific-Research, Design, Construction, and Technology Institute for Electrothermal Equipment. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 13–15, January, 1989.
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Stenishcheva, L.N., Seleznev, Y.N. Laser-arc treatment of steels. Met Sci Heat Treat 31, 16–19 (1989). https://doi.org/10.1007/BF00735321
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DOI: https://doi.org/10.1007/BF00735321