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Materials 2018, 11(2), 276;

Use of Ultrasound in Reconditioning by Welding of Tools Used in the Process of Regenerating Rubber

Faculty of Engineering, Lucian Blaga University of Sibiu, Sibiu 550024, Romania
Author to whom correspondence should be addressed.
Received: 1 January 2018 / Revised: 31 January 2018 / Accepted: 8 February 2018 / Published: 10 February 2018
(This article belongs to the Section Manufacturing Processes and Systems)
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Addressing the problem of reconditioning large parts is of particular importance, due to their value and to the fact that the technologies for their reconditioning are very complex. The tools used to refine regenerated rubber which measure 660 mm in diameter and 2130 mm in length suffer from a rather fast dimensional wear. Within this research, the authors looked for a welding reconditioning procedure that would allow a very good adhesion between the deposited material layer and the base material. In this regard, the MAG (Metal Active Gas) welding process was used, but the ultrasonic activation of the welding process was also considered. Thus, the wire used for welding was activated considering a variation of the frequency of ultrasounds in the range f = 18–22 kHz respectively of the oscillation amplitude A = 30–60 μm. Under these conditions it was found that the presence of ultrasonic waves during the welding cladding process results in uniform deposition of hard carbons at the grain boundary and in the elimination of any existing oxides on the deposition surface, but at the same time increases the adhesion between the base material and the additional material, all of which positively influence the wear and corrosion resistance of the tools used to refine the regenerated rubber. View Full-Text
Keywords: process; reconditioning; welding; ultrasounds; tools; regenerated rubber process; reconditioning; welding; ultrasounds; tools; regenerated rubber

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Dobrotă, D.; Petrescu, V. Use of Ultrasound in Reconditioning by Welding of Tools Used in the Process of Regenerating Rubber. Materials 2018, 11, 276.

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