중탄소강 SAW 용접금속의 응고 균열 발생에 미치는 용접재료의 영향

• Published in: 대한금속·재료학회지, 56(2) Vol. 56; no. 2; pp. 137 - 145
• Main Authors: 방국수, Kook-soo Bang, 송우현, Woo-hyun Song, 정홍철, Hong-chul Jung
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 05.02.2018; 대한금속·재료학회
• Subjects: element transfer; metals; SIMS; solidification; welding; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2018.56.2.137

The effects of submerged-arc welding consumables, wire and flux, on solidification cracking in the weld metal of medium-carbon steel were investigated. It showed that weld metal with a greater amount of C, S, and P had a wider brittleness temperature range, BTR, which resulted in longer total and maximum crack lengths in Varestraint tests. To determine the effect of flux on the amount of C, S, and P in the weld metal, transfers of the elements between the slag and the weld metal were evaluated. While C and S were removed from the weld metal to the slag, P was added from the slag to the weld metal. The amount of each element removed or added, however, was dependent on the basicity of the flux used. As the flux became more basic, more S was removed and less P was added, resulting in less S and P in the weld metal. In contrast, with increasing flux basicity, less C was removed, leaving a larger amount of C in the weld metal. Therefore, to minimize the amounts of these elements in the weld metal, in addition to the wire used, the flux basicity should also be carefully considered. (Received September 7, 2017; Accepted November 6, 2017)