TPWJ, 2015, #5-6, 26-29 pages
Modern state and challenges for development of laser and hybrid surfacing technologies (Review)
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue № 5/6, 2015 (May/June)
V.Yu. Khaskin, V.D. Shelyagin And A.V. Bernatsky
E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: email@example.com
The paper deals with development of the processes of laser and combined (for instance, laser-plasma) surfacing. It is shown that in these processes feeding the surfacing material (mainly, in the form of powder, less often - as wire) into the zone of impact of laser radiation focused into a spot of 1-5 mm diameter results in formation of a deposited layer of a certain height with the specified physico-chemical characteristics on the treated surface. The considered processes have a number of advantages and disadvantages. The advantages include: possibility of deposition of layers of 0.1-3.0 mm height with specified properties; considerable weakening of the effect of redistribution of components from base material into the deposited layer, promoting an increase of the accuracy of forecasting the results and making the deposited layer properties as close as possible to initial properties of the material being surfaced; producing equiaxed fine-crystalline (highly-dispersed) structures of the deposited metal and small (up to 0.1-0.5 mm) heat-affected zone; minimizing the allowance for finish machining to values of 0.3-0.5 mm to the side due to low roughness (up to Ra 200-300 mm) of the deposited surfaces. The disadvantages include: presence of transverse initial cold microcracks in the deposited layers, appearance of which is the result of relaxation of high internal tensile stresses; possibility of formation of both internal and external pores associated with non-metallic inclusions and residual humidity of the surfacing powder, as well as presence of treated surface contamination; relatively high cost of the process associated with comparatively high cost of laser equipment. It is shown that the main tendencies in development of laser surfacing technology in industrialized countries are as follows: producing corrosion- and wear-resistant coatings with improved physico-mechanical properties; synthesis of 3D objects; producing thin deposited layers with special properties. The prospects for further development of laser and laser-plasma (laser-arc) surfacing processes are associated with the ability to eliminate the drawbacks inherent to each of the components separately, due to interaction of these components. 16 Ref., 3 Figures.
laser technologies, hybrid and combined processes, commercial application, equipment, materials, prospects
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