TY - BOOK
T1 - Weldability of accelerated-cooled (AcC) high strength TMCP steel HT50
AU - Nevasmaa, Pekka
AU - Cederberg, Mark
AU - Vilpas, Martti
PY - 1992
Y1 - 1992
N2 - The report gives and briefly discusses the test results
obtained in welding and weldability tests of two
accelerated-cooled
AcC HT50 class steels. The tests comprised of mechanical
testing of
joints welded with arc energies ranging from 10 to 100
kJ/cm using
SAW and FCAW processes. Also the results of weld thermal
simulation
and Implant weldability tests are reported and discussed.
The results demonstrate the excellent weldability of AcC
HT50 steels, as compared to conventional normalized or QT
steels of
similar strength level. Even in heavily restrained
butt-welded joints,
welding without preheat was possible up to 50 and 60 mm
plate thickness
using low arc energies of 10 and 22 kJ/cm, respectively,
provided
that re-dried electrodes are used. No weld metal nor HAZ
cracking
were recognized in this HT50 class steels with any of the
arc energies
used, despite the heavy plate thicknesses of 35 to 50 mm
studied.
From the standpoint of the practical arc energy range
used with SAW and FCAW, weld metal toughness properties
were found
to be adequate with both methods. The same filler
material composition
yielding matching weld metal strength, was also
sufficient to guarantee
the required toughness (40 J/-40°C),
provided that the
maximum arc energy used does not exceed 45-50 and 100
kJ/cm when
adopting 1%Mn-2%Ni- and 0.4%Mo-Ti-B-alloyed filler
materials, respectively.
Excellent HAZ low-temperature toughness properties were
demonstrated
in Charpy-V tests. Despite a few low single values, all
AcC YS 420
steel weldments fulfilled the impact energy requirement
(40
J/-40°C)
in the arc energy range of 10 to 50 kJ/cm. In AcC YS 460
steel weldments,
this requirement was still met at
-60°C up to the arc
energy of 30-40 kJ/cm, and at
-40°C even with
an
extremely high arc energy of 100 kJ/cm. Also Charpy-V
tests of simulated
HAZ confirmed that there were no significant changes in
the HAZ toughness
level (40 J/-40°C) with the weld
cooling time
t<MV>8/5<D>
between 12 to 52 sec.
AB - The report gives and briefly discusses the test results
obtained in welding and weldability tests of two
accelerated-cooled
AcC HT50 class steels. The tests comprised of mechanical
testing of
joints welded with arc energies ranging from 10 to 100
kJ/cm using
SAW and FCAW processes. Also the results of weld thermal
simulation
and Implant weldability tests are reported and discussed.
The results demonstrate the excellent weldability of AcC
HT50 steels, as compared to conventional normalized or QT
steels of
similar strength level. Even in heavily restrained
butt-welded joints,
welding without preheat was possible up to 50 and 60 mm
plate thickness
using low arc energies of 10 and 22 kJ/cm, respectively,
provided
that re-dried electrodes are used. No weld metal nor HAZ
cracking
were recognized in this HT50 class steels with any of the
arc energies
used, despite the heavy plate thicknesses of 35 to 50 mm
studied.
From the standpoint of the practical arc energy range
used with SAW and FCAW, weld metal toughness properties
were found
to be adequate with both methods. The same filler
material composition
yielding matching weld metal strength, was also
sufficient to guarantee
the required toughness (40 J/-40°C),
provided that the
maximum arc energy used does not exceed 45-50 and 100
kJ/cm when
adopting 1%Mn-2%Ni- and 0.4%Mo-Ti-B-alloyed filler
materials, respectively.
Excellent HAZ low-temperature toughness properties were
demonstrated
in Charpy-V tests. Despite a few low single values, all
AcC YS 420
steel weldments fulfilled the impact energy requirement
(40
J/-40°C)
in the arc energy range of 10 to 50 kJ/cm. In AcC YS 460
steel weldments,
this requirement was still met at
-60°C up to the arc
energy of 30-40 kJ/cm, and at
-40°C even with
an
extremely high arc energy of 100 kJ/cm. Also Charpy-V
tests of simulated
HAZ confirmed that there were no significant changes in
the HAZ toughness
level (40 J/-40°C) with the weld
cooling time
t<MV>8/5<D>
between 12 to 52 sec.
KW - high strength steels
KW - welded joints
KW - weldability
KW - mechanical properties
KW - mechanical tests
KW - toughness
M3 - Report
SN - 951-38-4304-1
T3 - VTT Tiedotteita - Meddelanden - Research Notes
BT - Weldability of accelerated-cooled (AcC) high strength TMCP steel HT50
PB - VTT Technical Research Centre of Finland
CY - Espoo
ER -