Laser welding of Haynes 188 alloy sheet: thermal stress analysis

Yilbaş, Bekir Sami; Akthar, Sohail

doi:10.1007/s00170-011-3181-1

Cited by 16 publications

(8 citation statements)

References 8 publications

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“…Similarly, Hongxiao et al [14] and Kumar and Shahi [15] described the importance of the applied heat input on the weld microstructure, fusion zone shape, surface quality and mechanical properties of stainless steel joints. Although there have been a number of studies on the welding process of various alloy systems, there have been only two reports on superalloy Haynes 188 [16,17]. The primary aim of this study was to evaluate the effect of laser beam power on the microstructure and mechanical properties of laser beam welded superalloy Haynes 188.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the effects of heat input on microstructure and mechanical properties in laser beam welded Haynes 188 undermatched joints

Odabasi

Ünlü

Göller

et al. 2013

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Assessment of the effects of heat input on microstructure and mechanical properties in laser beam welded Haynes 188 undermatched joints

Odabasi

Ünlü

Göller

et al. 2013

Materials Science and Engineering: A

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“…B.S. Yilbas showed the same result for CO 2 laser welding of Haynes 188 alloy [6]. The liquid is generally solidified epitaxially with respect to the substrate.…”

Section: Microstructure Of Optimised Weldsmentioning

confidence: 56%

Weldability of the superalloys Haynes 188 and Hastelloy X by Nd:YAG

Graneix

Béguin

Pardheillan³

et al. 2014

MATEC Web of Conferences

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Abstract. The requirements for welded aircraft parts have become increasingly severe, especially in terms of the reproducibility of the geometry and metallurgical grade of the weld bead. Laser welding is a viable method of assembly to meet these new demands, because of automation, to replace the manual TIG welding process. The purpose of this study is to determine the weldability of Hastelloy X and Haynes 188 alloys by the butt welding process with a Nd:YAG laser. To identify the influential parameters of the welding process (laser power, feed rate, focal diameter and flow of gas) while streamlining testing, an experimental design was established with the CORICO software using the graphic correlation method. The position of the focal point was fixed at 1/3 of the thickness of the sheet. The gas flow rate and the power of the beam have a major effect on the mechanical properties and geometry of the weld. The strength of the weld is comparable to that of the base metal. However, there is a significant decrease in the elongation at break of approximately 30%. The first observations of the cross section of the weld by scanning electron microscopy coupled with EBSD analysis show a molten zone presenting dendritic large grains compared to the equiaxed grains of the base metals without a heat affected zone.

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“…They showed that the width of the welds and more generally the fusion zone (FZ) volume increased with the amount of energy used. Yilbas et al [15] demonstrated a fine dendritic structure at the center of the FZ, including a few marked HAZ. This result was also obtained by Caiazzo et al [16] for dissimilar welding of Haynes 188-Inconel 718 by a laser process.…”

Section: Introductionmentioning

confidence: 98%

“…Yilbas et al studied by finite element simulation the evolution of the thermal gradient and mechanical stresses generated during laser welding of Haynes 188 alloy sheets. [15] During heating, mechanical stresses are low because of low stiffness values at high temperatures. In contrast, from the first moments of cooling, mechanical stresses can reach high values in areas of high temperature gradients.…”

Section: Introductionmentioning

confidence: 99%