Paper Title:
The Occurrence of Humping in Welding with Highest Beam Qualities
  Abstract

The availability of lasers with highest beam qualities at laser powers of 1 kW (such as single-mode fibre laser, which nowadays come close to the theoretical limits) provides a unique tool to investigate welding process phenomena in a wide range of potential applications from welding with penetrations of some 50 "m to penetrations of some mm. Thus covering the field of micro welding as well as of macro welding, scalability of welding processes as well as size effects associated with the underlying physical phenomena may be of significance. In this paper, the humping effect will be given a closer look, as this periodic melt pool instability is an important limitation to possible welding speeds both in the micro and the macro range. Based on experimental investigations with a single-mode fibre laser (YLR-1000, laser power 1 kW, BPP < 0.4 mm*mrad), a model based on a modification of Rayleigh’s considerations on the stability of an inviscid incompressible fluid which is freely suspended in space and maintained only by surface tension is developed and discussed. It is shown that, within the scope of the investigations, humping to a large extent can be explained by Rayleigh’s theory, permitting to neglect the influence of three-dimensional melt flow.

  Info
Periodical
Main Theme
Edited by
F. Micari, M. Geiger, J. Duflou, B. Shirvani, R. Clarke, R. Di Lorenzo and L. Fratini
Pages
731-743
DOI
10.4028/www.scientific.net/KEM.344.731
Citation
C. Thomy, T. Seefeld, F. Vollertsen, "The Occurrence of Humping in Welding with Highest Beam Qualities", Key Engineering Materials, Vol. 344, pp. 731-743, 2007
Online since
July 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Jong Do Kim, Jin Seok Oh, Hyun Joon Park
Abstract:The application of laser welding technology has been considered to shipbuilding structure. However, when this technology is applied to...
1745
Authors: Souta Matsusaka, Toshiro Uezono, Takuya Tsumura, Manabu Tanaka, Takehiro Watanabe
Abstract:Galvanized steel sheets with a lap joint were welded by a laser-arc hybrid process. The hybrid system consisted of 2kW LD or YAG laser...
355
Authors: Seiji Katayama, Yousuke Kawahito, Masami Mizutani
Abstract:This paper describes laser and hybrid welding phenomena for the production of a sound and deep weld. The penetration of laser weld beads...
535
Authors: Shou Jin Sun, Milan Brandt
Abstract:The melt pool size of a single-track clad in the laser cladding of Hastelloy C, a Nickel based alloy, on mild steel substrate has been...
213
Authors: Johan Els, Michele Truscott, Kobus van der Walt, Gerrie Booysen
Chapter 3: Light Metals: Titanium
Abstract:Direct Metal Laser Sintering (DMLS) is a layer-by-layer Additive Manufacturing (AM) process that creates physical metal parts from three...
254