Weldability of Additive Manufactured Stainless Steel

Matilainen, Ville-Pekka; Pekkarinen, Joonas; Salminen, Antti

doi:10.1016/j.phpro.2016.08.083

Cited by 44 publications

(39 citation statements)

References 3 publications

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“…He concluded that steel produced by different methods is very well weldable and that heat treatment fundamentally affects the strength of SLM welded joints. Similar research was performed by Matilainen et al [ 6 ], when they used Laser welding as a welding method and came to the conclusion that the material produced by SLM has higher melt efficiencies at lower energy inputs (80 J/mm) than CR material. Furthermore, each material creates a different weld shape formation.…”

Section: Introductionsupporting

confidence: 67%

Analysis of Welded Joint Properties on an AISI316L Stainless Steel Tube Manufactured by SLM Technology

et al. 2020

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This work is focused on the analysis of the influence of welding on the properties and microstructure of the AISI316L stainless steel tube produced by 3D printing, specifically the SLM (Selective Laser Melting) method. Both non-destructive and destructive tests, including metallographic and fractographic analyses, were performed within the experiment. Microstructure analysis shows that the initial texture of the 3D print disappears toward the fuse boundary. It is evident that high temperature during welding has a positive effect on microstructure. Material failure occurred in the base material near the heat affected zone (HAZ). The results obtained show the fundamental influence of SLM technology in terms of material defects, on the properties of welded joints.

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Section: Introductionsupporting

confidence: 67%

Analysis of Welded Joint Properties on an AISI316L Stainless Steel Tube Manufactured by SLM Technology

et al. 2020

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“…Matilainen et al [4] investigated the application of laser beam welding to join SLM parts made of 316 L stainless steel in comparison to the welding of cold rolled steel sheets. The results show that laser beam welding is feasible to join SLM parts with an acceptable weld quality.…”

Section: State-of-the-artmentioning

confidence: 99%

“…To combine several parts to a bigger structure through welding would be a feasible strategy to improve the maximum size of SLM components. A large amount of research effort is needed to develop strategies and standards for that endeavor, as only few investigations on the joining of SLM parts can be currently found in the literature [4].…”

Section: Introductionmentioning

confidence: 99%

Laser Welding of SLM-Manufactured Tubes Made of IN625 and IN718

et al. 2019

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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.

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“…Our research focused on the structural integrity and fatigue performance of the hybrid tubular joints made of metal 3D printed nodes and conventional steel profiles. Figure 1A–C describes the properties of the joints under examination: the tubular intersection geometry (shape and wall thickness) is locally customised to the internal stresses so that the printed node (PBF) can be built as a unique body, and as a next fabrication step, the printed node is orthogonally welded to the conventional SS316L (CS) profiles 21 . This hybrid joint provides four major advantages: Reduced stress concentrations in the weld area (thus, the weld size can be decreased). Reduced force eccentricities in the joint (thus, the tube wall thickness can be decreased). Reduced number of assembling procedures (e.g., cutting and welding). Easily accessible welds for periodic inspection and maintenance. …”

Section: Introductionmentioning

confidence: 99%

“…The specific joint geometry used in this study contains the typical components of a tubular joint, and it was designed using topology optimisation during a previous work by the authors of this article. The previously designed node geometry 21 is here further optimised by reducing the stress concentrations.…”

Section: Introductionmentioning

confidence: 99%

Resource‐efficient joint fabrication by welding metal 3D‐printed parts to conventional steel: A structural integrity study

Chierici

Berto

Kanyilmaz

2021

Fatigue Fract Eng Mat Struct

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Metal 3D printing technology can increase the Architecture, Engineering and Construction (AEC) industry's resource‐efficiency by removing a major fabrication constraint: geometrical complexity. Since the large part dimensions are a current limit of metal 3D printers, we propose a ‘hybrid’ manufacturing approach by welding optimized printed nodes to conventional steel elements for tubular constructions. In this work, we identified suitable analytical formulations for metal 3D‐printed parts, and calibrated numerical models for hybrid joints by means of experimental results. Finally, we quantified the structural integrity performance of the hybrid joints. Numerical simulations highlighted the joints' most sensitive regions, where the optimisation reduced the stresses up to 40% under tensile loading. The butt weld between the printed node and the conventional profiles guaranteed a simple state of stress in the weld, providing the hybrid joint a fatigue life of 2 × 106 cycles under 100‐MPa cyclic loading. These results confirm that metal 3D printing combined with topology optimisation can remarkably reduce the quantity of resource‐consuming cutting and welding operations to fabricate a structural joint for static and fatigue loads.

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Weldability of Additive Manufactured Stainless Steel

Cited by 44 publications

References 3 publications

Analysis of Welded Joint Properties on an AISI316L Stainless Steel Tube Manufactured by SLM Technology

Analysis of Welded Joint Properties on an AISI316L Stainless Steel Tube Manufactured by SLM Technology

Laser Welding of SLM-Manufactured Tubes Made of IN625 and IN718

Resource‐efficient joint fabrication by welding metal 3D‐printed parts to conventional steel: A structural integrity study

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