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溶接学会論文集 Vol. 42 (2024), No. 3

ISIJ International
belloff
オンライン版ISSN:
冊子版ISSN: 0288-4771
発行機関: JAPAN WELDING SOCIETY

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キーワードランキング

16 Sep. (Last 30 Days)

溶接学会論文集 Vol. 42 (2024), No. 3

炭素鋼の狭開先溶接における凝固割れ発生とその対策

佐原 直樹, 山下 正太郎, 平田 弘征, 才田 一幸

pp. 105-113

DOI:

10.2207/qjjws.42.105

抄録

Pear-shaped bead cracking occurs in carbon steel when P/W, the ratio of penetration depth to bead width, increases. Pear-shaped bead cracking is a type of solidification cracking. In a previous study, we achieved the reduction of BTR in carbon steel by appropriate Ti addition. However, there are very few studies that pear-shaped bead cracking of carbon steel was prevented by reducing BTR. In this study, the effect of BTR reduction by Ti addition on the prevention of pear-shaped bead cracking was investigated. Narrow gap GMA welding was carried out using 0.15%C as the standard material and 0.15%C-0.95%Ti as the countermeasure material. In the weld metal microstructure of 0.15%C-0.95%Ti, there was a formation phase at dendrite boundaries and columnar grain boundaries. According to the EPMA analysis results, Ti-based oxides and MnS were formed in 0.15%C and in addition to these, TiC was formed in 0.15%C-0.95%Ti. The results of the theoretical investigation of BTR indicated that BTR was significantly reduced by Ti addition when Ti content was reduced to 0.74% in 0.15%C-0.95%Ti. Weld cracking was observed in the center of the weld metal in 0.15%C, but not in 0.15%C-0.95%Ti. Observation of the fracture surface of 0.15%C indicated that the cracking was solidification cracking. The occurrence of solidification cracking was determined by the weld shape ratio (P/W ratio). The solidification cracking at 0.15%C can be uniformly determined by the P/W ratio, and the cracking occurs when the P/W ratio exceeds 1.0. On the other hand, in 0.15%C-0.95%Ti, no solidification cracking occurred even when the P/W ratio exceeded 1.0. In other words, it was found that pear-shaped bead cracking (solidification cracking) of carbon steel can be prevented by reducing BTR.

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炭素鋼の狭開先溶接における凝固割れ発生とその対策

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