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논문 기본 정보

자료유형
학술저널
저자정보
Woong Kil (ESAB SeAH Corporation) Myeong-jun Shin (Pukyong National University) Kook-soo Bang (Pukyong National University)
저널정보
대한용접·접합학회 대한용접·접합학회지 大韓熔接·接合學會誌 第35卷 第5號
발행연도
2017.10
수록면
65 - 70 (6page)

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초록· 키워드

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Various fluorides, CaF₂, K₂SiF<SUB>6</SUB>, NaF, and LiF were added to self-shielded flux cored arc welding wires and their effects on the diffusible hydrogen content in the weld metal and the operating behavior were compared. Because of their easier vaporization and active reactions with hydrogen in the arc, K₂SiF<SUB>6</SUB>, NaF, and LiF were more effective than CaF₂ in reducing hydrogen content in weld metals. Even if slag basicity was varied from 1.92 to 2.53 depending on the fluoride added, no clear relationship was observed between the slag basicity and the hydrogen content, implying that a small variation of slag basicity has little influence on the hydrogen content in FCAW-S, which generates a large amount of gas during welding. The wires with K₂SiF<SUB>6</SUB>, NaF, and LiF gave a more aggressive and violent arc, and resulted in a larger amount of spattering, especially large size spatters, than the wire with CaF₂. It is believed that excessive volumes of vaporized gas in the wires with K₂SiF<SUB>6</SUB>, NaF, and LiF hinder droplet detachment and lead to droplet of larger sizes. Moreover, the wires with K₂SiF<SUB>6</SUB>, NaF, and LiF produced somewhat rough and irregular surfaces, having a slightly inconsistent bead height and width, resulting in restricted current and voltage ranges within which they can operate satisfactorily.

목차

Abstract
1. Introduction
2. Experiments
3. Results and Discussion
4. Conclusion
References

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