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

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• 作者：N. Bakir ; A. Gumenyuk ; M. Rethmeier
• 刊名：Welding in the World
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：60
• 期：5
• 页码：1001-1008
• 全文大小：1,639 KB
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669
• 卷排序：60

文摘

Solidification cracking phenomena taking place under controlled tensile weldability (CTW) test conditions have already been investigated both experimentally and numerically via FEA in order to get a better understanding of the mechanisms of hot crack formation during laser beam welding of austenitic steel grades. This paper develops a three-dimensional finite element model employing the contact element technique to simulate the formation and propagation of solidification cracks during laser full penetration welding of fully austenitic stainless steel 1.4376. During the experimental procedure, the resulting strain and displacement directed to the laser beam in the close vicinity of the weld pool was measured at the surface of the workpiece using a digital image correlation (DIC) technique with an external diode laser as an illuminating source. Local strain fields, global loads and crack lengths predicted by the model are in good agreement with those observed in experiments.Keywords (IIW Thesaurus)Solidification crackingFinite element analysisImagingLaser weldingAustenitic stainless steelsLoading