Hot cracking susceptibility of fillers 52 and 82 in alloy 690 welding

被引：72
|
作者：
Wu, W
Tsai, CH
机构：
[1] Department of Materials Science and Engineering, I-Shou University
[2] Tien Tai Electrode Co., Ltd.
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1999年 / 30卷 / 02期
关键词：
D O I：
10.1007/s11661-999-0331-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The hot cracking susceptibility of fillers 52 and 82 in a alloy 690 weldment is analyzed by the Varestraint test. Weld characteristics, microstructure, hardness distribution, and thermal analysis of the two filler metals are also examined. The weld metal of both fillers develops an extremely dense oxide layer. A stainless steel brush cannot remove the oxide layer, and a grinder may be needed between weld passes to assure a sound weld. Differential temperature analysis (DTA) shows that filler 82 has a lower melting point and a wider melting/solidification temperature differential (Delta T). These characteristics correlate with greater hot cracking susceptibility of filler 82 than 52 in Varestraint tests. The hot cracks are intergranular and are caused by elements segregating in grain boundies.
引用
收藏
页码：417 / 426
页数：10
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