A pair of Nd–YAG laser beams transmitted through optical fibres from two oscillators have been condensed separately and combined at a single point on the workpiece in order to enhance welding ability. Bead on plate tests were carried out with symmetric arrangements of condensing optics in two different welding directions. Transition from penetration with one keyhole bottom to penetration with two bottoms occurred as the laser power increased when the angles of incidence of the laser beams were 30 or 45°. No transition occurred at 15°. Melting efficiency increased dramatically at the transition power, the transition conditions being determined by laser power and heat input.
Get full access to this article
View all access options for this article.
References
1.
NorrisI., PetersC., and WilemanP.: Proc. Conf. ICALEO ’92, Orlando, FL, USA, November 1992, Laser Institute of America, 53.
2.
MiuraH., FujinagaS., and NarikiyoT.: Proc. Conf. ICPE ’95, Singapore, November 1995, Gintic Institute of Manufacturing Technology, 155.
3.
MiuraH., FujinagaS., NarikiyoT., OhmoriA., OkinoK., and WatanabeS.: Proc. Conf. GCL/HPL ’96, Edinburgh, UK, August 1996, Heriot-Watt University, 736.
4.
IshideT., HashimotoY., HamadaS., AkabaT., and OnozukaM.: Proc. National Meeting of the Japan Welding Society, Hiroshima, Japan, October 1995, Japan Welding Society, Vol. 57, p. 464.
5.
FujinagaS., MiuraH., NarikiyoT., KatayamaS., and OhmoriA.: Proc. Conf. ECLAT ’96, Stuttgart, Germany, September 1996, Arbeitsgemeinschaft Warmbehandlung und Werkstofftechnik, 789.
6.
NarikiyoT., FujinagaS., MiuraH., OhmoriA., and ArataY.: Proc. Conf. ICALEO ’95, San Diego, CA, USA, November 1995 Laser Institute of America, 885.
7.
NarikiyoT., MiuraH., FujinagaS., and OhmoriA.: Opt. Lett, October 1996, 1562–1563.
8.
NarikiyoT., MiuraH., FujinagaS., and OhmoriA.: Proc. National Meeting of the Japan Welding Society’, Toyama, Japan, October 1996, Japan Welding Society, Vol. 59, p. 60.
9.
DausingerF., BeckM., RudlaffT., and WahlT.: Proc. 5th Conf. on Lasers in Manufacturing, September 1988, IFS Ltd, 177–185.
