Compared with the welding of stainless steel at the conventional welding speed, the microstructures and properties of joint can be affected by the solidification process, which would be changed in high-speed welding. The butt welds with good weld appearance were obtained by tandem tungsten inert gas (tandem TIG) welding 304 stainless steel plate of 1.2 mm thickness at the welding speed of 3.0 m/min. And compared with the conventional single TIG welded joint, the properties of welds by tandem TIG welding were studied by nonstandard tensile specimens, and the microstructures were analyzed. The experimental results showed that the equiaxed grains formed in the weld center, the directions of dendrite grains on both side of weld center were not the opposite in tandem TIG weld, and the tensile strength and elongation of tandem TIG weld were slightly lower than that of base metal. Compared with the conventional single TIG welding, the average diameter of the grain in heat affected zone of tandem TIG joint decreased by 10.3%, but the average diameter of the grain in weld center increased by 12.9%, the tensile strength and elongation of tandem TIG weld increased by 4.3% and 23.2%, respectively. The micro-hardness in weld center of tandem TIG welded joint were slightly higher than that of base metal.
JIANG Haihong
,
QIN Guoliang
,
FENG Chao
,
CHEN Yong
,
WANG Shilu
. Microstructure and properties of weld by high-speed tandem TIG welding of thin 304 stainless steel plate[J]. Transactions of The China Welding Institution, 2019
, 40(1)
: 15
-18
.
DOI: TG444.73
[1] 杨春利, 林三宝. 电弧焊基础[M]. 哈尔滨:哈尔滨工业大学出版社, 2003.
[2] 秦国梁. 一种薄壁钢管高速焊接生产工艺及装置:中国, 2011100553468[P]. 2011-08-17.
[3] 秦国梁, 孟祥萌, 付邦龙, 等. 薄壁不锈钢管列置双TIG电弧高速焊接工艺[J]. 机械工程学报, 2015, 51(12):83-88 Qin Guoliang, Meng Xiangmeng, Fu Banglong, et al. High speed tandem TIG welding of thin-walled stainless steel pipe[J]. Journal of Mechanical Engineering, 2015, 51(12):83-88
[4] 王娟, 李亚江, 郑德双, 等. 填丝TIG焊接Mo-Cu合金与18-8不锈钢接头的微观组织[J]. 焊接学报, 2011, 32(12):77-80 Wang Juan, Li Yajiang, Zheng Deshuang, et al. Microstructure of Mo-Cu alloy and 18-8 stainless steel joint by TIG with filler metal[J]. Transactions of the China Welding Institution, 2011, 32(12):77-80
[5] Lippold J C, Savage W F. Solidification of austenitic stainless steel weldments:part 2-the effect of alloy composition on ferrite morphology[J]. Welding Journal, 1980, 59(2):48s -58s.
[6] El-Batahgy A M. Effect of laser welding parameters on fusion zone shape and solidification structure of austenitic stainless steels[J]. Materials Letters, 1997, 32(2-3):155-163.
[7] Kurt H İ, Samur R. Study on microstructure, tensile test and hardness 304 stainless steel jointed by TIG welding[J]. International Journal of Science and Technology, 2013, 2(2):163-168.
[8] Brooks J A, Yang N C Y, Krafcik J S. Clarification on development of skeletal and lathy ferrite morphologies in stainless steel welds[J]. Science and Technology of Welding and Joining, 2001, 6(6):412-414.
[9] Brooks J A, Williams J C, Thompson A W. Microstructural origin of the skeletal ferrite morphology of austenitic stainless steel welds[J]. Metallurgical and Materials Transactions A, 1983, 14(7):1271-1281.
[10] Qin G, Meng X, Fu B. High speed tandem gas tungsten arc welding process of thin stainless steel plate[J]. Journal of Materials Processing Technology, 2015, 220:58-64.
[11] Savage W F, Matsuda F, Hashimoto T, 等. 不锈钢焊接冶金[M]. 栗卓新, 朱学军, 译. 北京:化学工业出版社, 2004.
