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Main Title: Laser Welding of SLM-Manufactured Tubes Made of IN625 and IN718
Author(s): Jokisch, Torsten
Marko, Angelina
Gook, Sergej
Üstündag, Ömer
Gumenyuk, Andrey
Rethmeier, Michael
Type: Article
Language Code: en
Abstract: The advantage of selective laser melting (SLM) is its high accuracy and geometrical flexibility. Because the maximum size of the components is limited by the process chamber, possibilities must be found to combine several parts manufactured by SLM. An application where this is necessary, is, for example, the components of gas turbines, such as burners or oil return pipes, and inserts, which can be joined by circumferential welds. However, only a few investigations to date have been carried out for the welding of components produced by SLM. The object of this paper is, therefore, to investigate the feasibility of laser beam welding for joining SLM tube connections made of nickel-based alloys. For this purpose, SLM-manufactured Inconel 625 and Inconel 718 tubes were welded with a Yb:YAG disk laser and subsequently examined for residual stresses and defects. The results showed that the welds had no significant influence on the residual stresses. A good weld quality could be achieved in the seam circumference. However, pores and pore nests were found in the final overlap area, which meant that no continuous good welding quality could be accomplished. Pore formation was presumably caused by capillary instabilities when the laser power was ramped out.
Issue Date: 12-Sep-2019
Date Available: 20-Nov-2019
DDC Class: 600 Technik, Technologie
Subject(s): additive manufacturing
powder bed fusion
Journal Title: Materials
Publisher: MDPI
Publisher Place: Basel
Volume: 12
Issue: 18
Article Number: 2967
Publisher DOI: 10.3390/ma12182967
EISSN: 1996-1944
Appears in Collections:FG Fügetechnik » Publications

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