Simulation analysis of Cr35Ni45Nb cracking furnace tube welding process based on double ellipsoidal heat source
by Ying Sun; Zongying Gao; Guozhang Jiang; Gongfa Li; Bo Tao; Hegen Xiong; Yongcheng Cao
International Journal of Wireless and Mobile Computing (IJWMC), Vol. 21, No. 3, 2021

Abstract: The welded joints of Cr35Ni45Nb cracking furnace tubes often crack and fail under the effect of residual welding stress, causing large economic losses. In this paper, a finite element model of a Cr35Ni45Nb cracking furnace tube with an outer diameter of 88 mm and a wall thickness of 7 mm is established, and a double ellipsoidal heat source is used to apply the load. Use Python language to write the life and death unit to carry out the secondary development of ABAQUS to simulate the generation process of solder in the welding process. The laser power is selected as the independent variable, and the sequential coupling method is used to analyse the influence of temperature and residual stress on it during the welding process. The research results show that the higher the laser power, the temperature reached on the weld area will also be higher. The largest axial residual stress appears in the area away from the weld, and the largest circumferential residual stress appears on the outer surface of the weld.

Online publication date: Wed, 16-Feb-2022

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