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Abstract: The effects of CeF3 on the sizes and distribution of
non-metallic inclusions in weld metal welded with self-shielded flux
cored wire are systematically studied. The main non-metallic inclusions
in weld metal are AlN and Al2O3. The results show that CeF3 can refine
non-metallic inclusions and decrease the amount of large dimension
inclusions. And the low temperature impact toughness is improved by
adding suitable amount of CeF3 in the flux. This difference in
non-metallic inclusions evolution is attributed to the inclusion
floating performance during solidification of weld metal. RE can promote
such floating out performance.
Key
words: CeF3 Self-shielded flux cored wire Non-metallic
inclusions Notch toughness
CLC No: TG4
Received 20040302, received in
revised form 20040802
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