Welding of high thicknesses using a fibre optic laser up to 30 kW

1. Italian translation of the paper presented at EUROJOIN7 – GNS5 Technical Session: ‘Advanced and improved traditional welding processes’, Venice Lido, 21–22 May 2009.

Abstract

The industrial applications of high-power fibre optic lasers include welding, 2D and 3D cutting, remote cutting and welding, brazing and surface treatments. The availability of fibre optic lasers with power outputs in excess of 10 kW might allow the development of novel fields of application in the welding of high thickness pieces: shipbuilding and offshore industries, pipe and cable manufacture and other heavy industry sectors. Carrying the beam by fibre optics allows high flexibility, even for the production of very large pieces, such as in the shipbuilding sector. This study describes the laser welding of high thickness pieces using a 30 kW laser and a 200 μm diameter fibre. On the one hand, such lasers allow a weld penetration depth of over 30 mm in a single pass, and very high process speeds for thinner materials on the other. Combining lasers with conventional arc welding techniques (hybrid welding) allows further optimization of weld quality and makes it possible to weld butt joints with a ‘gap’ of up to 1 mm. This paper presents the most recent results from very high-power fibre optic laser welding along with new applications in the manufacturing sector.

Keywords:

• combined processes
• comparisons
• development
• distortion
• fibre lasers
• GMA welding
• laser welding
• off-shore structures
• pipelines
• shipbuilding
• submerged arc welding, thick
• thickness
• utilization

Notes

1. Italian translation of the paper presented at EUROJOIN7 – GNS5 Technical Session: ‘Advanced and improved traditional welding processes’, Venice Lido, 21–22 May 2009.