Formation behaviors of blowhole and chill layer by GTAW in cast iron

被引：0

作者：

Hasegawa, Toshiyuki ^{[1
]}

Okubo, Michinori ^{[1
]}

机构：

[1] College of Industrial Technology, Nihon University

来源：

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society | 2015年 / 33卷 / 03期

关键词：

Activity; Blowhole; Cast iron; Chemical potential; Chill layer; Constitutional supercooling; Diffusion; Filler metal; Flake/nodular graphite; GTAW;

D O I：

10.2207/qjjws.33.288

中图分类号：

学科分类号：

摘要：

Cast irons have some excellent characteristics in wear resistance and vibrational damping etc., and widely used in many industrial machinery applications. But the weldability has been much inferior originated from its high carbon content. Several researches have reported that some of the important factors affecting the weldability were formation of blowhole and chill layer during fusion welding and subsequent rapid cooling. In this study, the formation behaviors of those were investigated in both flake and nodular graphite cast irons. Tungsten inert gas arc welding was performed using several kinds of filler metal varied nickel and chromium content. The study was made by paying attention to carbon behavior and influence of nickel and chromium in filler metal on it. Experimental results obtained were as follows. (1) The amount of blowhole increased with nickel content and decreased with chromium content. (2) On the other hand, the amount of chill layer increased with chromium content and decreased with nickel content. (3) It was estimated that both blowhole and chill layer formation were related to activity and diffusivity changes of carbon affected by nickel and chromium content. Then consequently they have a correlation relationship each other.

引用

页码：288 / 294

页数：6

共 18 条

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