Title: Simulation analysis of Cr35Ni45Nb cracking furnace tube welding process based on double ellipsoidal heat source

Authors: Ying Sun; Zongying Gao; Guozhang Jiang; Gongfa Li; Bo Tao; Hegen Xiong; Yongcheng Cao

Addresses: Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan, Hubei, China; Institute of Precision Manufacturing, Wuhan University of Science and Technology, Wuhan, Hubei, China ' Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan, Hubei, China; Biomanipulator and Intelligent Measurement and Control Research Centre, Wuhan University of Science and Technology, Wuhan, Hubei, China ' Institute of Precision Manufacturing, Wuhan University of Science and Technology, Wuhan, Hubei, China; Institute of 3D Printing and Intelligent Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan, Hubei, China ' Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan, Hubei, China; Biomanipulator and Intelligent Measurement and Control Research Centre, Wuhan University of Science and Technology, Wuhan, Hubei, China ' Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan, Hubei, China; Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan, Hubei, China ' Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan, Hubei, China; Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan, Hubei, China ' Hubei Jingmen Wusan Machinery Equipment Manufacturing Co., Ltd., Jingshan, Hubei, China

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.

Keywords: Cr35Ni45Nb; double ellipsoidal heat source; life and death unit; residual welding stress.

DOI: 10.1504/IJWMC.2021.120900

International Journal of Wireless and Mobile Computing, 2021 Vol.21 No.3, pp.230 - 242

Received: 29 Sep 2021
Accepted: 11 Nov 2021
Published online: 16 Feb 2022 *

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