Influence of Ultrasound on Pore and Crack Formation in Laser Beam Welding of Nickel-Base Alloy Round Bars

Welding by laser beam is a method for creating deep and narrow welds with low influence on the surrounding material. Nevertheless, the microstructure and mechanical properties change, and highly alloyed materials are prone to segregation. A new promising approach for minimizing segregation and its e...

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Bibliographic Details
Published in:Metals (Basel ) 2020-10, Vol.10 (10), p.1299
Main Authors: Grajczak, Jan, Nowroth, Christian, Nothdurft, Sarah, Hermsdorf, Jörg, Twiefel, Jens, Wallaschek, Jörg, Kaierle, Stefan
Format: Article
Language:English
Subjects:
Acoustics
Alloying
Alloys
Antinodes
Bead on plate welding
Cavitation
Corrosion resistance
Excitation
excitation methods
Experiments
Hot cracks
Inspection
Laser beam welding
Lasers
Mechanical properties
melt pool dynamics
Microstructure
Nickel alloys
nickel base alloy 2.4856
Nickel base alloys
Resonant vibration
Round bars
Solidification
Solids
Stainless steel
Ultrasonic imaging
Ultrasonic transducers
ultrasound
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Summary:Welding by laser beam is a method for creating deep and narrow welds with low influence on the surrounding material. Nevertheless, the microstructure and mechanical properties change, and highly alloyed materials are prone to segregation. A new promising approach for minimizing segregation and its effects like hot cracks is introducing ultrasonic excitation into the specimen. The following investigations are about the effects of different ultrasonic amplitudes (2/4/6 µm) and different positions of the weld pool in the resonant vibration distribution (antinode, centered, and node position) for bead on plate welds on 2.4856 nickel alloy round bars (30 mm diameter) with a laser beam power of 6 kW. The weld is evaluated by visual inspection and metallographic cross sections. The experiments reveal specific mechanisms of interaction between melt and different positions regarding to the vibration shape, which influence weld shape, microstructure, segregation, cracks and pores. Welding with ultrasonic excitation in antinode position improves the welding results.
ISSN:2075-4701
2075-4701
DOI:10.3390/met10101299