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http://dx.doi.org/10.5916/jkosme.2016.40.9.768

Comparison of clad layer characteristics with overlapping criterion in multi pass laser cladding  

Kim, Jong-Do (Division of Marine Engineering, Korea Maritime and Ocean University)
Lee, Eun-Jin (Graduate School, Korea Maritime and Ocean University)
Whang, Jun-Gu (Graduate School, Korea Maritime and Ocean University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.40, no.9, 2016 , pp. 768-773 More about this Journal
Abstract
Engine valve seat and face, which are the important factors affecting engine performance, are required to have wear, heat and corrosion resistance. In order to produce surface layer with these characteristics, PTA(plasma transferred arc) surfacing procedure is generally employed, but problems, such as large HAZ and high dilution etc., frequently occurr. Laser cladding, which overcomes the drawbacks of conventional technologies, can be employed to create a superior clad layer with low dilution, small heat affected zone, and minimal distortion. However, in case cladding is to be applied to a large area, it is necessary to overlap 1 pass clad layer because of limited clad layer width. Two criteria for the overlapping ratio-beam size and clad layer width-have been considered thus far. Upon inspection of multi pass clads, produced by different overlapping criteria, it was observed that the greater the increase in overlapping ratio, the greater was the decrease in clad layer width and increase in clad layer height regardless of the criterion used. However, a multi pass clad overlapped by the beam size criterion demonstrated a higher hardness value than a clad overlapped by the clad layer width owing to decreasing dilution of the substrate. In conclusion, the beam size was defined as the criterion for the overlapping, because the clad layer width increased or decreased depending upon process parameters.
Keywords
Laser cladding; Overlapping; Beam size; Clad layer width;
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Times Cited By KSCI : 1  (Citation Analysis)
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