2020
DOI: 10.1007/s40194-020-00847-w
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Experimental and numerical study on the influence of the laser hybrid parameters in partial penetration welding on the solidification cracking in the weld root

Abstract: 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.… Show more

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Cited by 10 publications
(3 citation statements)
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“…The numerical model did not include the Marangoni effect and the surface tension, which has a great impact on the face of weld geometry. However, based on the small differences in other ( Figure 7 and Figure 8 ) weld geometries, the established model gave realistic results and was used for joint stress–strain analysis [ 68 , 69 , 70 ].…”
Section: Discussionmentioning
confidence: 99%
“…The numerical model did not include the Marangoni effect and the surface tension, which has a great impact on the face of weld geometry. However, based on the small differences in other ( Figure 7 and Figure 8 ) weld geometries, the established model gave realistic results and was used for joint stress–strain analysis [ 68 , 69 , 70 ].…”
Section: Discussionmentioning
confidence: 99%
“…It is assumed, that the cracks are formed mainly due to excessively rapid cooling during the last stage of solidification (where the fraction of solid metal is in the range of 0.90-0.95). Such high cooling rates provides (i) a rapid grain growth from both sides that generates a lack of fusion at the weld centerline, (ii) hard brittle phases within the area, and (iii) high tensile stresses/strains [9,40]. There are also metallurgical factors of hot cracking such as (i) the grain size and morphology within weld centerline [41]; (ii) misorientation angles of grains; (iii) segregation of harmful elements (i.e., sulfur); and (iv) the existence of the secondary phases.…”
Section: Weld Characterization Using Y-groovementioning
confidence: 99%
“…The increased hardness and high cooling rates involved in deep LBW/LAHW frequently provides cracking and porosity issues. Cracking is a common problem that mainly occurs at the weld centerline near the root area, due to the stress field during solidification [9], and is commonly referred to as solidification or hot cracking [10]. Porosity mainly forms due to unstable keyhole conditions providing poor degassing in combination with fast solidification in deep welds [11].…”
Section: Introductionmentioning
confidence: 99%