Cathode-focused high-current arc: Heat source development with stable keyhole in stationary welding

被引：14
作者：
Chen, S. Y. [1 ,2 ]
Liu, Z. M. [1 ,2 ,3 ,4 ]
Zhao, X. C. [3 ]
Lv, Z. Y. [5 ]
Fan, X. G. [6 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Tianjin Key Lab Adv Joining Technol, Tianjin 300072, Peoples R China
[3] Liaocheng Univ, Sch Mat Sci & Engn, Liaocheng 252000, Shandong, Peoples R China
[4] Cent S Univ, State Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China
[5] Tianjin Inst Nav Instrument, Tianjin 300131, Peoples R China
[6] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2019年 / 143卷
基金：
中国国家自然科学基金;
关键词：
Heat source model; K-TIG; Numerical simulation; Cathode focusing; Weld pool; Keyhole; GAS TUNGSTEN; THERMIONIC CONVERTERS; THERMAL-BEHAVIOR; FLUID-FLOW; POOL; SIMULATION; STEEL; PERFORMANCE; METAL; MODEL;
D O I：
10.1016/j.ijheatmasstransfer.2019.118475
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A three-dimensional numerical model was established to investigate the thermal coupling mechanism in the K-TIG (Keyhole Tungsten Inert Gas) keyhole and weld pool. Especially, to reflect the energy distribution in the new-developed high-current free burning arc, a novel, suitable combined heat source model was proposed. The dynamic process of heat source and the corresponding temperature field were studied to reflect the effect of arc on the workpiece. Keyhole evolution with temperature distribution and fluid flow in the weld pool was investigated to further explore the keyhole influence on the heat transfer and mechanical energy of the weld pool. Some new features of K-TIG were discovered. The higher temperature molten metal is distributed mainly in the upper part instead of the bottom of the weld pool, and the weld pool volume of K-TIG is large, up to 50 mm(3). Finally, the first emerging time of a fully penetrated keyhole, keyhole size, and fusion line size were measured in stationary welding experiments. The simulation results agreed well with the measured data. The results lay a foundation for understanding the coupling behavior in energy source-keyhole-weld pool system, and they could promote the engineering application of K-TIG process. (C) 2019 Elsevier Ltd. All rights reserved.
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页数：13
相关论文
共 43 条
[31]   SURFACE-TENSION OF BINARY METAL - SURFACE-ACTIVE SOLUTE SYSTEMS UNDER CONDITIONS RELEVANT TO WELDING METALLURGY [J].
SAHOO, P ;
DEBROY, T ;
MCNALLAN, MJ .
METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY, 1988, 19 (03) :483-491
[32]   Characteristics of an autogenous single pass electron beam weld in thick gage CA6NM steel [J].
Sarafan, S. ;
Wanjara, P. ;
Champliaud, H. ;
Thibault, D. .
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 2015, 78 (9-12) :1523-1535
[33]   Penetration state recognition based on the double-sound-sources characteristic of VPPAW and hidden Markov Model [J].
Song, Shuo ;
Chen, Huabin ;
Lin, Tao ;
Wu, Di ;
Chen, Shanben .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2016, 234 :33-44
[34]   Thermal energy generation and distribution in friction stir welding of aluminum alloys [J].
Su, H. ;
Wu, C. S. ;
Pittner, A. ;
Rethmeier, M. .
ENERGY, 2014, 77 :720-731
[35]   Influences of deposited metal material parameters on weld pool geometry during shield metal arc welding [J].
Tong, L. G. ;
Gu, J. C. ;
Wang, L. ;
Yin, S. W. .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2015, 90 :968-978
[36]   Numerical simulation of TIG weld pool dynamics using smoothed particle hydrodynamics [J].
Trautmann, M. ;
Hertel, M. ;
Fuessel, U. .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2017, 115 :842-853
[37]  
Wu CS, 2006, WELD J, V85, p284S
[38]   An adaptive heat source model for finite-element analysis of keyhole plasma arc welding [J].
Wu, C. S. ;
Hu, Q. X. ;
Gao, J. Q. .
COMPUTATIONAL MATERIALS SCIENCE, 2009, 46 (01) :167-172
[39]  
Wu C.S., 2010, WELDING THERMAL PROC
[40]   Analysis of mechanisms of underfill in full penetration laser welding of thick stainless steel with a 10 kW fiber laser [J].
Zhang, Mingjun ;
Zhang, Zheng ;
Tang, Kun ;
Mao, Cong ;
Hu, Yongle ;
Chen, Genyu .
OPTICS AND LASER TECHNOLOGY, 2018, 98 :97-105
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