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Improvement of filler wire dilution using external oscillating magnetic field at full penetration hybrid laser-arc welding of thick materials

 
: Üstündağ, Ö.; Avilov, V.; Gumenyuk, A.; Rethmeier, M.

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Fulltext ()

Metals 9 (2019), No.5, Art. 594, 10 pp.
ISSN: 2075-4701
English
Journal Article, Electronic Publication
Fraunhofer IPK ()

Abstract
Hybrid laser-arc welding offers many advantages, such as deep penetration, good gap bridge-ability, and low distortion due to reduced heat input. The filler wire which is supplied to the process is used to influence the microstructure and mechanical properties of the weld seam. A typical problem in deep penetration high-power laser beam welding with filler wire and hybrid laser-arc welding is an insufficient mixing of filler material in the weld pool, leading to a non-uniform element distribution in the seam. In this study, oscillating magnetic fields were used to form a non-conservative component of the Lorentz force in the weld pool to improve the element distribution over the entire thickness of the material. Full penetration hybrid laser-arc welds were performed on 20-mm-thick S355J2 steel plates with a nickel-based wire for different arrangements of the oscillating magnetic field. The Energy-dispersive X-ray spectroscopy (EDS) data for the distribution of two tracing elements (Ni and Cr) were used to analyze the homogeneity of dilution of the filler wire. With a 30° turn of the magnetic field to the welding direction, a radical improvement in the filler material distribution was demonstrated. This would lead to an improvement of the mechanical properties with the use of a suitable filler wire.

: http://publica.fraunhofer.de/documents/N-558657.html