CUTEAN Elena Simona Politehnica University of Timisoara

Spoluautoři MITELEA Ion, SERBAN Viorel- Aurel, BURCA Mircea

Due to the ongoing development of industry, the production processes must be carried out in safety and economical conditions. In this regard, one of the solutions is the use of welding technologies in the field of surface engineering by using filler materials that ensure high functional properties of the deposited layers. This field is based on a series of processes that modify the physical state of the pieces surface in order to improve the operational performance, to increase the lifetime and to obtain economic benefits. The welding processes are applied to pieces that are subjected to complex stresses during operation in order to achieve an effective protection. The materials selected for the deposition must resist in extreme environmental conditions maintaining the properties imposed. Among these, titanium and its alloys are materials with relatively low specific weight, excellent mechanical properties, very good corrosion resistance and a high level of bio-compatibility, but also a higher cost compared to steels. This paper presents the replacement of some titanium alloys pieces, which are working in corrosive environments, by steel pieces, which surfaces are coated with titanium, using TIG welding technique. The deposited layers are analyzed by optical and electronic microscopy, and the results show a good interpenetration of the materials used, no discontinuities and defects. The electrochemical corrosion tests in various environments show good electrochemical corrosion resistance of the combined system layer - substrate.

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