Suppression of dilution in Ni-Cr-Si-B alloy cladding layer by controlling diode laser beam profile. (1st February 2018)

• Record Type: Journal Article
• Authors: Tanigawa, Daichi; Funada, Yoshinori; Abe, Nobuyuki; Tsukamoto, Masahiro; Hayashi, Yoshihiko; Yamazaki, Hiroyuki; Tatsumi, Yoshihiro; Yoneyama, Mikio
• Is Part Of: Optics & laser technology. Volume 99(2018)
• Page Start: 326
• Page End: 332
• Publication Date: 2018-02-01
• Subjects: Laser cladding -- Flat-top profile -- Diode laser -- Surface roughness -- Dilution; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2017.09.019
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Ni-Cr-Si-B alloy coating was produced on type 304 stainless steel plate by diode laser with flat-top beam profile. A diode laser with flat-top beam profile was developed. Dilution was suppressed by controlling the beam profile of diode laser. Vickers hardness of layer was increased by using diode laser with flat-top beam profile. Ra of the cladding layer was decreased by using diode laser with flat-top beam profile. Abstract: A Ni-Cr-Si-B alloy layer was produced on a type 304 stainless steel plate by laser cladding. In order to produce cladding layer with smooth surface and low dilution, influence of laser beam profile on cladding layer was investigated. A laser beam with a constant spatial intensity at the focus spot was used to suppress droplet formation during the cladding layer formation. This line spot, formed with a focussing unit designed by our group, suppressed droplet generation. The layer formed using this line spot with a constant spatial intensity had a much smoother surface compared to a layer formed using a line spot with a Gaussian-like beam. In addition, the dilution of the former layer was much smaller. These results indicated that a line spot with a constant spatial intensity was more effective in producing a cladding layer with smooth surface and low dilution because it suppressed droplet generation.