• Journal of Power System Engineering
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• v.9 no.4
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• pp.110-117
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• 2005

Underwater wet arc welds were experimentally performed on 11mm thick KR-RA steel plate using six different types of flux coated electrodes of 4.0mm diameter, KSKR, KSKT, USBL, JPUW, UWEA and UWEB. From analysis of bead appearance, detachability of weld slag, spatter occurrence and arc stability, JPUW gives the best result, and UWEB is superior to KSKR and KSKT. By experimental result of hardness distribution on the weld bonds, UWEB weld has the narrowest bond structure which is probable condition to get the best mechanical properties of weld. UWEB and JPUW welds have more even hardness distribution across weld deposit and base metal. Upon polarization test to measure the respondency of corrosion, the electrode of UWEB shows the most excellent degree due to the low open circuit potential difference.

• Journal of Power System Engineering
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• v.10 no.4
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• pp.111-118
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• 2006

Underwater wet arc welds were experimentally performed on 11mm thick KR-RA steel plate using six different types of flux coated electrodes of 4.0mm diameter, KSKR, KSKT, USBL, JPUW, UWEA and UWEB. From analysis of bead appearance, detachability of weld slag, spatter occurrence and arc stability, JPUW gives the best result, and UWEB is superior to KSKR and KSKT. By experimental result of hardness distribution on the weld bonds, UWEB weld has the narrowest bond structure which is probable condition to get the best mechanical properties of weld. UWEB and JPUW welds have more even hardness distribution across weld deposit and base metal. Upon polarization test to measure the respondency of corrosion, the electrode of UWEB shows the most excellent degree due to the low open circuit potential difference.

• Journal of Power System Engineering
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• v.12 no.2
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• pp.48-54
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• 2008

Underwater wet arc welds of rolled steel plate (SM41) where studied welding and mechanical properties macro and narrow than that of the other things. Tensile strength of UWEB obtained to 521.5 MPa and of USBL was 524.1 MPa, but the highest elongation value was 4.68 %(UWEB). Bending strength(1166.6 MPa) of USBL is the largest and of UWEB in 1047 MPa, But deflection(22.73 mm) of UWEB in large than that of USBL(22.63 mm). Impact value(144.36 $J/cm^2$) of JPUW is the largest and of UWEB(140 $J/cm^2$) come after.