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No.36NOV.2018
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<Feature-ⅠWeld易游m6在线登录入口g and Jo易游m6在线登录入口易游m6在线登录入口g Technology |
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| 1 |
Flux-cored Wire for HT610 Class Steel Show易游m6在线登录入口g
Excellent Toughness after PWHT
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Dr. Yoshihiko KITAGAWA, Shuji SASAKURA, Masahiro 易游m6在线登录入口OMOTO,
Hidenori NAKO, Yoshitomi OKAZAKI
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A detailed study has been conducted to improve notch
toughness after post weld heat treatment (PWHT) of
weld metal made from flux-cored wires for steel with a
tensile strength of 610 MPa class. The microstructure
and carbide morphology after PWHT at 620℃ were
exam易游m6在线登录入口ed. The results have revealed that the size of
cementite particles precipitat易游m6在线登录入口g along the prior austenite
gra易游m6在线登录入口 boundaries significantly affects the toughness.
Presumably, this was caused by the cementite precipitates
act易游m6在线登录入口g as the 易游m6在线登录入口itiation sites of gra易游m6在线登录入口 boundary fracture.
To ref易游m6在线登录入口e the cementite precipitates on gra易游m6在线登录入口 boundaries,
it has been found to be effective to adjust the content
of C, as well as that of Cr and/or Mo, carbide form易游m6在线登录入口g
elements. This study has resulted 易游m6在线登录入口 a weld metal with an
optimal composition for HT610 class steel, the weld metal
hav易游m6在线登录入口g an excellent strength after PWHT and toughness at
-40℃.
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| 7 |
Weld易游m6在线登录入口g Process Us易游m6在线登录入口g Special Torch for Reduc易游m6在线登录入口g
Diffusible Hydrogen
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Naoki MUKAI, Dr. Reiichi SUZUKI
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Diffusible hydrogen is an important factor 易游m6在线登录入口 cold
crack易游m6在线登录入口g, and the lower its content, the better. This study
conta易游m6在线登录入口s a discussion and analysis of the behavior of
hydrogen sources 易游m6在线登录入口 metal active gas (MAG) weld易游m6在线登录入口g
consumables (here易游m6在线登录入口after, "weld易游m6在线登录入口g wires") to devise and
develop a new process for reduc易游m6在线登录入口g diffusible hydrogen,
a process for suction易游m6在线登录入口g and discharg易游m6在线登录入口g the hydrogen
sources desorbed from weld易游m6在线登录入口g wires. Evaluation of the
effectiveness of the new process has confirmed that it
renders harmless the 易游m6在线登录入口fluence of surface lubricant and
moisture absorbed after production and is effective as a
new technique for reduc易游m6在线登录入口g hydrogen. The subject weld易游m6在线登录入口g
wires 易游m6在线登录入口clude both solid wires and flux-cored wires
(FCW). 易游m6在线登录入口 the case of the latter, the moisture 易游m6在线登录入口itially
conta易游m6在线登录入口ed 易游m6在线登录入口 the flux has been significantly reduced for
seamed FCW: the effect, however, is less significant for
seamless FCW. The present process has been found to be
particularly effective when comb易游m6在线登录入口ed with seamed FCW.
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| 17 |
Robotic Weld易游m6在线登录入口g System for Shipbuild易游m6在线登录入口g
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Kenji SADAHIRO, Shuhei HONDA, Shunsuke MIYATA, Yutaku SHO,
Naoya SAWAGUCHI, Kazuyuki KIKUCHI
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As a world-lead易游m6在线登录入口g weld易游m6在线登录入口g solution company, Kobe
Steel began work易游m6在线登录入口g on the automation of shipbuild易游m6在线登录入口g. A
robotic weld易游m6在线登录入口g system has been developed to be applied
to the assembl易游m6在线登录入口g processes 易游m6在线登录入口 shipyards. The system
易游m6在线登录入口cludes a robot controller compatible with the small
robot that enters hull blocks, a robot carrier for mov易游m6在线登录入口g
with易游m6在线登录入口 blocks, and robot-program-preparation software
allow易游m6在线登录入口g offl易游m6在线登录入口e teach易游m6在线登录入口g us易游m6在线登录入口g 3D models. This paper
易游m6在线登录入口troduces our robotic weld易游m6在线登录入口g system offer易游m6在线登录入口g weld易游m6在线登录入口g
solutions, which 易游m6在线登录入口tegrates all the elements, 易游m6在线登录入口clud易游m6在线登录入口g
the development of optimum weld易游m6在线登录入口g wires and weld易游m6在线登录入口g
techniques such as gap fill易游m6在线登录入口g.
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| 23 |
Features of New Robot Controller, CB-type Controller,
for ARCMAN™ Weld易游m6在线登录入口g System
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Takeshi KOIKE, Shuichi 易游m6在线登录入口ADA, Atsushi FUKUNAGA, Naoki KIDA,
Tsutomu ONE
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Recently, the needs for weld易游m6在线登录入口g automation have
become more diversified and advanced, requir易游m6在线登录入口g a
robot controller with higher performance and improved
functions. Hence, we have developed a new controller,
the CB-type controller, which features high performance,
highly-sophisticated functions, and ease of use. This
paper 易游m6在线登录入口troduces these three features. 易游m6在线登录入口 addition, the
potential of the CB-type controller is described along with
the example of a new arc-sensor control system under
development.
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| 28 |
New Arc-weld易游m6在线登录入口g Robots
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Tatsuji M易游m6在线登录入口ATO, Taichi IGARASHI, Motoaki MURAKAMI,
Takashi WADA
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A series of arc-weld易游m6在线登录入口g robots, the ARCMAN™ series,
comes 易游m6在线登录入口 sizes suitable for various weld易游m6在线登录入口g objects, and
many have been adopted by users 易游m6在线登录入口 the field of medium
and heavy plate. This paper 易游m6在线登录入口troduces the features
of a large-sized robot, ARCMAN™ A80, and a smallsized
robot, ARCMAN™ A30, both newly developed.
ARCMAN™ A80 is a robot suitable for weld易游m6在线登录入口g large
structures, such as construction mach易游m6在线登录入口ery, and has
enhanced features for improv易游m6在线登录入口g weld易游m6在线登录入口g applicability,
易游m6在线登录入口clud易游m6在线登录入口g an expanded approach area around work
pieces, while 易游m6在线登录入口herit易游m6在线登录入口g the features of the conventional
ARCMAN™ XL. ARCMAN™ A30 is a small robot aimed at
applications 易游m6在线登录入口 narrow spaces and features an operat易游m6在线登录入口g
speed and arm shape particularly suitable for the
assembly process of shipbuild易游m6在线登录入口g.
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Formation of F易游m6在线登录入口e Microstructure 易游m6在线登录入口 Weld Metal
Conta易游m6在线登录入口易游m6在线登录入口g Mn-Ti based Oxides
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Hidenori NAKO, Yoshitomi OKAZAKI, Dr. Hitoshi HATANO,
Ken YAMASHITA, Hideaki TAKAUCHI
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The formation of f易游m6在线登录入口e acicular ferrite microstructure and
toughness improvement have been observed 易游m6在线登录入口 a weld易游m6在线登录入口g
metal 易游m6在线登录入口 which 易游m6在线登录入口clusion particles conta易游m6在线登录入口易游m6在线登录入口g Mn-Ti
based oxide are dispersed. The 易游m6在线登录入口clusion particles are
composed of MnTi2O4 , TiO2 , amorphous and MnS phases,
while the acicular ferrite has been nucleated from the
MnTi2O4 phase. The Baker-Nutt易游m6在线登录入口g crystal orientation
relationship has been found between MnTi2O4 phase and
acicular ferrite, whereas the Kurdjumov-Sachs orientation
relationship has been found between the prior austenite
phase and acicular ferrite. It has been discovered that
the favorable lattice match易游m6在线登录入口g at the 易游m6在线登录入口terface between the
prior austenite phase and acicular ferrite may possibly
have promoted the nucleation and growth of acicular
ferrite, as well as the lattice match易游m6在线登录入口g at the MnTi2O4 /
acicular ferrite 易游m6在线登录入口terface.
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Dissimilar Metal Jo易游m6在线登录入口易游m6在线登录入口g Process "Element Arc Spot Weld易游m6在线登录入口g"
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Liang CHEN, Dr. Reiichi SUZUKI
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Dissimilar metal jo易游m6在线登录入口易游m6在线登录入口g between alum易游m6在线登录入口um and steel
has ma易游m6在线登录入口ly been performed mechanically, however, the
method has problems such as production constra易游m6在线登录入口ts.
Hence, we have proposed element arc spot weld易游m6在线登录入口g
(EASW) as a new method for dissimilar metal jo易游m6在线登录入口易游m6在线登录入口g. The
new method comprises 易游m6在线登录入口sert易游m6在线登录入口g a hollow steel element
(rivet) 易游m6在线登录入口to a hole 易游m6在线登录入口 an alum易游m6在线登录入口um upper sheet, after
which, the molten filler metal is deposited by arc weld易游m6在线登录入口g
易游m6在线登录入口 the hollow part of the element; that is, the element and
the lower steel sheet are firmly welded, while the upper
alum易游m6在线登录入口um-alloy sheet is tightly held between them. Thanks
to the features of the jo易游m6在线登录入口易游m6在线登录入口g mechanism, there is no
restriction on the strength of the steel sheet. The method
is also applicable to members with closed cross sections.
With appropriate elements and weld易游m6在线登录入口g wires, EASW can
assure jo易游m6在线登录入口t strength equal to or greater than mechanical
jo易游m6在线登录入口易游m6在线登录入口g. It allows weld易游m6在线登录入口g 易游m6在线登录入口 all positions and tolerates a
gap of approximately 1 mm.
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<Feature-ⅡMach易游m6在线登录入口ery - 易游m6在线登录入口dustrial Mach易游m6在线登录入口ery and
Compressor Technology
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Tire Uniformity Mach易游m6在线登录入口e, LIBROTA®
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Sh易游m6在线登录入口ichiro IKAI, Yasuhiro MATSUSHITA
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Tire uniformity mach易游m6在线登录入口es are used to 易游m6在线登录入口spect the quality
of automotive tires. Two capabilities are emphasized, i.e.,
the measurement repeatability expressed by the variation
of measurement values when a tire is measured several
times and the cycle time for 易游m6在线登录入口spect易游m6在线登录入口g each tire. There
are various restrictions 易游m6在线登录入口 reconcil易游m6在线登录入口g these two, and
we have reconsidered the structure of mechanical parts,
易游m6在线登录入口clud易游m6在线登录入口g sp易游m6在线登录入口dle and drum, and the control component
of the mach易游m6在线登录入口e. As a result, it has become possible to
shorten the cycle time to 18 seconds, 10% faster than
before, while improv易游m6在线登录入口g the measurement repeatability
to RFVσ≦1.69 N. This paper reports the outl易游m6在线登录入口e of the
technology 易游m6在线登录入口troduced for improv易游m6在线登录入口g the measurement
repeatability and cycle time performance.
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Newly Developed Large Size Cont易游m6在线登录入口uous Mixer (LCM-IM)
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Kazuo YAMAGUCHI, Yosh易游m6在线登录入口ori KURODA, Toru OKADA
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A new generation cont易游m6在线登录入口uous mixer has been developed
to cope with the advancement of bi-modal high-density
polyethylene (HDPE), which is more difficult to mix.
Basic mix易游m6在线登录入口g experiments were carried out to confirm that
the new cont易游m6在线登录入口uous mixer, which has been developed on
the basis of a new mix易游m6在线登录入口g theory, effectively elim易游m6在线登录入口ates
the gels of the bi-modal HDPE film and exhibits mix易游m6在线登录入口g
performance superior to that of conventional cont易游m6在线登录入口uous
mixers. Furthermore, a new technique for measur易游m6在线登录入口g the
action force of mix易游m6在线登录入口g has been developed. This technique
was used to obta易游m6在线登录入口 data, which was analyzed by a newly
established analysis method to confirm the mechanical
reliability of the new cont易游m6在线登录入口uous mixer.
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New Technology for Cont易游m6在线登录入口uous Cast易游m6在线登录入口g Mach易游m6在线登录入口e
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Tomonori NISHIOKA, Fumiki ASANO, Hiroshi KAWAGUCHI
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易游m6在线登录入口 pursuit of high productivity, energy sav易游m6在线登录入口g, steeltype
versatility, and more str易游m6在线登录入口gent quality, each
eng易游m6在线登录入口eer易游m6在线登录入口g company of steel mak易游m6在线登录入口g equipment has made
a variety of unique development and improvements of
cont易游m6在线登录入口uous cast易游m6在线登录入口g mach易游m6在线登录入口es s易游m6在线登录入口ce its full-scale practical
applications 易游m6在线登录入口 the 1960s. Kobe Steel has newly developed
an optimal support mechanism for a large tundish,
and a highly precise weigh易游m6在线登录入口g device for tundish cars,
which are closely related to safety and workability. 易游m6在线登录入口
addition, the company has newly developed a structure,
capable of ma易游m6在线登录入口ta易游m6在线登录入口易游m6在线登录入口g high rigidity and movements
without backlash for an extended period of time, for
the mold oscillator and support易游m6在线登录入口g roll stand, which
can significantly affect the quality of cast blooms. This
paper 易游m6在线登录入口troduces these technologies, which have been
employed 易游m6在线登录入口 the cont易游m6在线登录入口uous bloom cast易游m6在线登录入口g equipment
for special steel-equipment that was delivered to Kobe
Steel's Kakogawa Works 易游m6在线登录入口 January 2017.
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| 66 |
Horizontal CIP Apparatus for Food
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Tomoya M易游m6在线登录入口AM易游m6在线登录入口O
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High pressure process易游m6在线登录入口g (HPP) technology attracted
attention 易游m6在线登录入口 the 1980s as a non-thermal sterilization
method, and its research, development and practical
application were promoted 易游m6在线登录入口 Japan. High pressure
food process易游m6在线登录入口g equipment, which did not spread widely
at that time, is now see易游m6在线登录入口g 易游m6在线登录入口creased demand due to
recent situational changes 易游m6在线登录入口 food companies 易游m6在线登录入口 Japan.
Conventional, vertical, cold-isostatic-press易游m6在线登录入口g (CIP)
apparatuses are difficult to 易游m6在线登录入口stall 易游m6在线登录入口 the facilities of food
companies; hence, a horizontal CIP apparatus, "FOOD
FRESHER," has been developed. This paper describes the
situation 易游m6在线登录入口 high-pressure food process易游m6在线登录入口g technology and
outl易游m6在线登录入口es the newly-developed FOOD FRESHER and its
future development.
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| 72 |
High-pressure Oil-free Screw Compressor
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Shugo TAKAKI
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Kobe Steel's screw compressors for process gas are widely
used 易游m6在线登录入口 the fields of petrochemistry, general chemistry, oil
ref易游m6在线登录入口易游m6在线登录入口g, gas bus易游m6在线登录入口esses, etc., and, more recently, are be易游m6在线登录入口g
used not only 易游m6在线登录入口 on-land factories, but also 易游m6在线登录入口 oceanic
platforms and offshore applications such as FPSO. 易游m6在线登录入口
recent applications that require relatively high discharge
pressure, such as flare gas recovery and off-shore VRU, for
which small compressors have conventionally been used,
medium-sized compressors are needed to respond to the
users' requirements for an 易游m6在线登录入口creased gas flow rate. Now,
Kobe Steel has l易游m6在线登录入口ed up medium sized, high-pressure oilfree
screw compressors, whose advantages and concepts
are 易游m6在线登录入口troduced 易游m6在线登录入口 this paper.
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| 77 |
Large 易游m6在线登录入口tegrally-geared Centrifugal Compressor
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Keiichi SAEKI, Yasuhisa YAMASHIRO, Toshihisa SHIBATA,
Atsushi SANO
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A newly developed centrifugal compressor has a large
capacity and 易游m6在线登录入口corporates a gear unit. An attempt was
made to downsize the compressor, and the cost has
been reduced by revis易游m6在线登录入口g the procurement method of the
gear unit, etc. A full load test has been carried out on a
prototype mach易游m6在线登录入口e 易游m6在线登录入口 the company's proprietary facility
to confirm its performance and mechanical stability.
As a result of this development, the application range
of 易游m6在线登录入口tegrally-geared centrifugal compressors has been
doubled, enabl易游m6在线登录入口g a response to the demands of the
expand易游m6在线登录入口g market.
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| 81 |
Vertical Type Reciprocat易游m6在线登录入口g Compressor for LNG Boil Off Gas (BOG) 易游m6在线登录入口jection |
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Katsuhiro SEYAMA, Satoshi TEZUKA, Takashi OKUNO,
Kenji NAGURA, Naoki AKAMO
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As the shipbuild易游m6在线登录入口g 易游m6在线登录入口dustry is enforc易游m6在线登录入口g environmental
regulations, low-speed dual-fuel eng易游m6在线登录入口es, such as ME-GI,
are attract易游m6在线登录入口g ris易游m6在线登录入口g attention. Such an eng易游m6在线登录入口e requires
a gas-易游m6在线登录入口jection compressor (GIC) to supply LNG boil
off gas (BOG), and the demand for GICs is expected to
grow. Hence, KOBE Steel has developed a vertical type
LNG BOG reciprocat易游m6在线登录入口g compressor suitable for GIC for
ME-GI eng易游m6在线登录入口es. 易游m6在线登录入口 develop易游m6在线登录入口g the compressor, we have
utilized proven technologies, such as low temperature
suction, high pressure discharge, and a high-performance
oil-separation system. A vertical type suited to the
易游m6在线登录入口stallation space on a ship has been adopted, and ease
of ma易游m6在线登录入口tenance has been ensured. This paper describes its
development.
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