In order to increase efficiency in pipeline construction, examinations of new welding processes for joining of pipes are indispensable with the focus on increasing the welding speed at a reduced number of passes. A possible alternative is the laser-GMA hybrid welding process, since due to the development of the fiber laser a beam source with new fields of application is available. The objective of the investigations presented was to prove the principal suitability of hybrid welding for pipeline construction as well as the behaviour of this process in out-of-position welding which is required for its application. Furthermore, both closed seam profiles were produced and hardening increase of the heat-affected zones of the root area were reduced for a pipe wall thickness of 10 mm for an arc process trailing the hybrid welding. The results distinctively show the potential of the hybrid process at high laser output and with brilliant beam qualities. In a next step of the examinations the results are to be transferred to larger pipe wall thicknesses. As an alternative of the existing approaches there is the idea of using the hybrid process for the production of a high quality root pass at root faces of 12-15 mm. This approach is the basis of the examinations currently performed.
Laser based girth welding technologies for pipeline construction
The Paton Welding Journal ; 2 ; 31-36
2011
6 Seiten, 15 Bilder, 4 Tabellen, 5 Quellen
Aufsatz (Zeitschrift)
Englisch
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