Improved Efficiency in Ship Hull Production through Laser Welding of Partially Penetrated T-Joints (AVIF-Nr. A 151)

Responsible research centre: Schweißtechnische Versuchsanstalt Mecklenburg-Vorpommern GmbH (Prof. Seyffarth)

Time period: 01.01.2002 - 30.04.2004

Final report: CMT 4/2004


Project summary:

 

These investigations have been carried out, to qualify partially penetrated T-joints to the rules of the classification societies for shipbuilding industries. Subjects of the investigations were laser welded T-joints and MSG-laser-hybrid welded T-joints.

Welding tests had to demonstrate, that the welding parameters enable a safe repetition of welding seam quality in production. This was done by using a statistical program to investigate the influences of the parameters on the result of the quality of the weld.

The welding results have been proven by means of dynamical strength tests. It was shown, that the notch of the root has the most important influence on the dynamical strength of the partially penetrated T-joints. The penetration depth of the gap between the plate and the stiffener is less important.

The dynamical strength of partially penetrated laser or MSG-laser-hybrid welded T-joints is better than the reference FAT-class for fully penetrated and partially penetrated MSG-joints.

In this project, the MSG-laser-hybrid welded T-joints were qualified to acquire the approval of the classification societies for partially penetrated T-joints.

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