Original scientific paper

Effect of nonmetallic inclusions on steel welds metal hot cracking

B. Zorc ; Welding Institute, Ljubljana, Slovenia
M. Imamović ; University of Zenica, Faculty of Mechanical Engineering, Zenica, B and H
A. Nagode ; University of Ljubljana, Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia
A. Stoić ; University of Osijek, Mechanical Engineering Faculty, Slavonski Brod, Croatia
B. Kosec ; University of Ljubljana, Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia
I. Samardžić ; University of Osijek, Mechanical Engineering Faculty, Slavonski Brod, Croatia
L. Kosec ; University of Ljubljana, Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia

Abstract

Intercrystally distributed nonmetallic inclusions greatly increase weld susceptibility to hot cracking. Oxide and sulphide inclusions are the result of contaminated base material or its highly oxidised surfaces and they can be a consequence of metallurgical reactions between welding slag and remelted base material, while carbide inclusions can occur due to the mixing of high-carbon base and low-carbon filler material. All welding surfaces must thus be cleaned before welding and the least possible mixture of base with filler material must be enusured during welding.

Keywords

nonmetal inclusions; dissolution of base metal; oxidized surface; hot cracking

Hrčak ID:

110062

URI

https://hrcak.srce.hr/110062

Publication date:

1.4.2014.

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