DW-55E
(AWS A5.20 ER71T-9J)
Excellent low-temperature notch toughness at
down to minus 40°C enables DW-55E flux-cored wire to
be more versatile in application. Offshore structures
and ships are typical applications for this all-position
rutile cored wire.
DW-55E Is More than Equal to
Conventional Wires
DW-55E is classified as E71T-9J. The last digit, J, of
the AWS classification designates this wire as meeting
the optional requirements for improved toughness with
27 J at minus 40°C. Conventional E71T-9 wires meet
only the requirements of 27J at minus 20°C .
Beyond the matter of the AWS classification, the
excellent notch toughness of DW-55E has been proven
in production weld joints, too. Table 1 shows impact
test results of the weld metal of this wire welded with
butt joints in several welding positions. As shown in the
table, the results are sufficiently high, although the
impact energies are affected by welding position (or heat
input) and specimen removal location (or
microstructure) at both testing temperatures.
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Ship-Class Approvals Certify the
Quality of DW-55E for High Grade
Steels in Shipbuilding
DW-55E is approved as a Grade-3 flux-cored wire by
the following ship-class societies in the world.
NK: Nippon Kaiji Kyokai (Japan)
AB: American Bureau of Shipping (USA)
LR: Lloyd's Register of Shipping (UK)
NV: Det Norske Veritas (Norway)
BV: Bureau Veritas (France)
GL: Germanischer Lloyd (Germany)
CR: Central Research of Ships S. A. (Taiwan)
Grade-3 approval is given to the welding consumables
that satisfy the strict notch toughness specified by ship-
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