Numerical modeling of enhanced nitrogen dissolution during gas tungsten arc welding

被引:37
作者
Palmer, TA [1 ]
Debroy, T [1 ]
机构
[1] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
来源
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2000年 / 31卷 / 06期
关键词
D O I
10.1007/s11663-000-0023-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Weld-metal nitrogen concentrations far in excess of Sieverts-Iaw calculations during gas tungsten are (GTA) welding of iron are investigated both experimentally and theoretically. A transient, three dimensional mathematical model has been developed to calculate the residual nitrogen concentrations during GTA welding. This mode, combines calculations for the plasma phase with those for nitrogen absorption and for the transport of nitrogen by convection and diffusion in the weld metal and diffusion throughout the weldment. In addition, the model takes into account the roles of turbulence and the nitrogen desorption reaction in affecting the residual nitrogen concentration in the weldment. Autogeneous GTA welding experiments in pure iron have been performed and the resulting nitrogen concentrations compared with the modeling results. Both experimental and modeled nitrogen concentrations fall in a range between 2.7 and 4.7 times higher than Sieverts-law calculations at a temperature of 2000 K. Modeled nitrogen concentrations correlate well with the experimental results, both in magnitude and in the general trends, with changes in the travel speed and nitrogen addition to the shielding gas.
引用
收藏
页码:1371 / 1385
页数:15
相关论文
共 65 条
[1]  
ALLUM CJ, 1991, B WELDING RES COUNC, V369, P68
[2]  
[Anonymous], 1997, MATH MODELLING WELD
[3]  
[Anonymous], WELDING J
[4]  
BLAKE PD, 1971, J IRON STEEL I, V209, P197
[5]  
BLAKE PD, 1979, WELD RES INT, V9, P23
[6]  
BODSWORTH C, 1963, PHYSICAL CHEM IRON S
[7]  
Brandes E.A., 1983, SMITHELLS METALS REF
[8]  
Chase M. W., 1985, JANAF THERMOCHEMICAL
[9]  
CHOO RTC, 1994, WELD J, V73, pS25
[10]   ON THE CALCULATION OF THE FREE-SURFACE TEMPERATURE OF GAS-TUNGSTEN-ARC WELD POOLS FROM 1ST PRINCIPLES .1. MODELING THE WELDING ARC [J].
CHOO, RTC ;
SZEKELY, J ;
WESTHOFF, RC .
METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY, 1992, 23 (03) :357-369