Numerical simulation of solidification crack formation during laser beam welding of austenitic stainless steels under external load

Bakir, Nasim; Gumenyuk, Andrey; Rethmeier, Michael

doi:10.1007/s40194-016-0357-1

Cited by 11 publications

(4 citation statements)

References 9 publications

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“…Quiroz et al [14] applied this technique to measure the strain distributions on the bottom of the specimen surface during bead-on-plate partial penetration welding conducted in the controlled tensile weldability-test (CTW-test) facility, but circumventing the influence of laser light and plasma on the image quality. Bakir et al [15, 16] employed the DIC technique to conduct in-situ measurements of strains during the formation of solidification cracks. The experimental setups used allow measurements of the displacement and the strain approximately 2 mm from the fusion line.…”

Section: Introductionmentioning

confidence: 99%

Investigation of solidification cracking susceptibility during laser beam welding using an in-situ observation technique

Bakir

Gumenyuk

Rethmeier

2018

Science and Technology of Welding and Joining

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In recent years, laser beam welding has found wide applications in many industrial fields. Solidification cracks are one of the most frequently encountered welding defects that hinder obtaining a safe weld joint. Decades of research have shown that one of the main causes of such cracks are the strain and the strain rate. Obtaining meaningful measurements of these strains has always been a major challenge for scientists, because of the specific environment of the measurement range and the many obstacles, as well as the high temperature and the plasma plume. In this study, a special experimental setup with a high-speed camera was employed to measure the strain during the welding process. The hot cracking susceptibility was investigated for 1.4301 stainless steel, and the critical strain required for solidification crack formation was locally and globally determined.

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Section: Introductionmentioning

confidence: 99%

Investigation of solidification cracking susceptibility during laser beam welding using an in-situ observation technique

Bakir

Gumenyuk

Rethmeier

2018

Science and Technology of Welding and Joining

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“…Fig. 18 Schematic representation of a weld in the weld root with nonparallel (a) and parallel (b) fusion lines; the direction of solidification is indicated by the arrows, adapted from [19]…”

Section: Discussionmentioning

confidence: 99%

“…The wire stick-out was kept at 18 mm. The Controlled Tensile Weldability test (CTW) [6,19] was used for all experiments under a defined restraint intensity of 20 kN (mm mm) −1 . A set of experiments was performed in advance with a variation of the restraint intensity between 3.5 kN (mm mm) −1 and 80 kN (mm mm) −1 .…”

Section: Methodsmentioning

confidence: 99%

Experimental and numerical study on the influence of the laser hybrid parameters in partial penetration welding on the solidification cracking in the weld root

et al. 2020

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The aim of the present study is to investigate the influence of the laser hybrid welding parameters on the solidification cracks in the weld root for partial penetration welding. Welding trials were performed on thick-walled high-strength steels of grade S690QL under the same critical restraint intensity, with a variation of the welding velocity, wire feeding rate, and the focal position of the laser beam. It was ascertained that the welding velocity has a high impact on the solidification cracking phenomenon. A decrease in the welding speed leads to a reduction of the number of cracks in the weld root. The arc power has also a slight influence on the solidification cracking, while the change of the focal position of the laser beam shows also a remarkable effect. Besides, numerical simulation was performed to understand the thermomechanical behavior of the welds for different welding parameters to assist the interpretation of the experimental results.

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“…Bakir et al [15] performed FE thermomechanical simulations of laser welding in stainless steel. The use of contact elements with a cohesive zone behavior allowed them to predict the crack length.…”

Section: Introductionmentioning

confidence: 99%

On the Prediction of Hot Tearing in Al-to-Steel Welding by Friction Melt Bonding

Jimenez-Mena

Jacques

Drezet

et al. 2018

Metall Mater Trans A

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Aluminum alloy AA6061 was welded to dual-phase steel 980 (DP980) by the friction melt bonding (FMB) process. Hot tears have been suppressed by controlling the thermomechanical cycle. In particular, the welding speed and the thermal conductivity of the backing plate have been optimized. A finite-element thermomechanical model coupled with the Rappaz-Drezet-Gremaud (RDG) criterion has been used to explain these experimental observations. The hot tear susceptibility has been reduced with large thermal gradients and with the formation of a cellular microstructure. Both effects are favored by a backing plate made of a material with high thermal conductivity, such as copper.

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Numerical simulation of solidification crack formation during laser beam welding of austenitic stainless steels under external load

Cited by 11 publications

References 9 publications

Investigation of solidification cracking susceptibility during laser beam welding using an in-situ observation technique

Investigation of solidification cracking susceptibility during laser beam welding using an in-situ observation technique

Experimental and numerical study on the influence of the laser hybrid parameters in partial penetration welding on the solidification cracking in the weld root

On the Prediction of Hot Tearing in Al-to-Steel Welding by Friction Melt Bonding

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