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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2009.1
- 수록면
- 471 - 477 (7page)
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초록· 키워드
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Submerged arc welding was performed using metal-cored wires and fluxes with different compositions. The
effects of wire/flux combination on the chemical composition, tensile strength, and impact toughness of the
weld metal were investigated and interpreted in terms of element transfer between the slag and the weld
metal, i.e., △ quantity. Both carbon and manganese show negative △ quantity in most combinations, indicating
the transfer of the elements from the weld metal to the slag during welding. The amount of transfer, however,
is different depending on the flux composition. More basic fluxes yield less negative △C and △Mn through
the reduction of oxygen content in the weld metal and presumably higher Mn activity in the slag, respectively.
The transfer of silicon, however, is influenced by Al2O3, TiO2 and ZrO2 contents in the flux. △Si becomes
less negative and reaches a positive value of 0.044 as the oxides contents increase. This is because Al, Ti,
and Zr could replace Si in the SiO2 network, leaving more Si free to transfer from the slag to the weld
metal. Accordingly, the Pcm index of weld metals calculated from chemical compositions varies from 0.153
to 0.196 depending on the wire/flux combination, and it almost has a linear relationship with the tensile
strength of the weld metal.
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