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Satoshi Yamane, Akito Tanaka, Hikaru Yamamoto, Toru Nakajima, Yasuyosh ...
Session ID: 101
Published: 2007
Released on J-STAGE: May 30, 2007
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The authors compared numerical simulation of temperture profile of weld pool in finite-element analysis during double-electrode welding process with experimentally measured results.
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Yasuyuki Maekawa, Kenji Oshima, Satoshi Yamane, Yasuyoshi Kaneko
Session ID: 102
Published: 2007
Released on J-STAGE: May 30, 2007
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In the robotic one side thin plate welding process without of backing plate, for obtaining the good quality of the weld, it is important to control the weld pool shape and the cooling time so as to prevent the melting metal from burning through. In this paper authors propose the switch back welding method to control the weld pool. The numerical simulation and the experimental result have proved that the switch back welding method is effective and satisfactory for controlling the weld pool shape.
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Seiji Sasabe, Tetsu Iwase, Yasunori Hattori, Tadaaki Miono
Session ID: 103
Published: 2007
Released on J-STAGE: May 30, 2007
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In this work, MIG-brazing of aluminum alloy and newly developed Hot-dip aluminized steel sheets on lap joint was investigated. This paper has reported the effect of post-heat-treaments on the lap joint strength and thickness of intermetallic compounds on the interfaces.
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Hitoshi Nishimura, Jing-bo Wang, Seiji Katayama, Masami Mizutani
Session ID: 104
Published: 2007
Released on J-STAGE: May 30, 2007
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It is well know that Mg evaporated during pulsed MIG arc welding of aluminum alloy of 5000 series to form fume or smut. In this report, the autors reported the results achived by analyzing Mg contents at the tip of droplets which were got at different pulsed period. Also, a novel method was used to observe the evaporation of Mg from droplet surface by using high speed video.
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Bead Formation Phenomena and Weld Toe Shape Control
Muneo Matsushita, Tokihiko Kataoka, Rinsei Ikeda, Moriaki Ono, Koichi ...
Session ID: 105
Published: 2007
Released on J-STAGE: May 30, 2007
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It is recognized that joint fatigue strength is influenced by stress concentration derived from toe shape. This report reports the development of "Plasma-Arc Hybrid Welding Technology", which is the combination of plasma and gas metal arc welding, enabling stable bead formation and toe shape control as well as efficient single pass welding.
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Enhancement of Fatigue Strength by Means of Toe Shape Control for Lap-Fillet Weld Joint of High Strength Steel
Muneo Matsushita, Tokihiko Kataoka, Rinsei Ikeda, Moriaki Ono, Koichi ...
Session ID: 106
Published: 2007
Released on J-STAGE: May 30, 2007
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Plasma-arc hybrid welding was performed on the lap-fillet joint of high strength steel sheet and its joint fatigue strength was investigated. Toe shape was measured to determine stress concentration factor. Thus, relationship between joint fatigue strength and toe shape was clarified.
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Observations of arc phenomena in plasma GMA welding of mild steels
Manabu TANAKA, Takahiro TAMAKI, Kazuhiro NAKATA, Toshio OHNAWA, Tomoyu ...
Session ID: 107
Published: 2007
Released on J-STAGE: May 30, 2007
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We present the observed results of arc phenomena with metal transfers and weld bead formations in plasma GMA welding of mild steels.
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Wire melting and penetration characteristics on aluminum alloy
OHNAWA Toshio, UEYAMA Tomoyuki, TANAKA Manabu, NAKATA Kazuhiro
Session ID: 108
Published: 2007
Released on J-STAGE: May 30, 2007
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In this report we indicate basic results of experiments of wire melting and penetration characteristics on Aluminum alloy by Plasma GMA Welding method
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Satoru Asai, Tsuyoshi Ogawa, Kenji Oota, Toshiyuki Minemura
Session ID: 109
Published: 2007
Released on J-STAGE: May 30, 2007
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The application of Plasma-MIG hybrid welding process to the welding of copper was studied.
It was confirmed that the balance between Plasma current and MIG current was effect on the arc stability by bead on test. And, the optimum welding conditions were selected for the welding of copper with copper filler wire. As a basis of test results, the fillet welding of the dissimilar materials between copper and carbon steel tried to be applied by Plasma –MIG hybrid process. Consequently,
it was confirmed that both the preheat effect of plasma heat and high deposition rate of MIG effectively acted on the weldability the dissimilar materials which have the different thermal conductivity.
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Satoshi Yamane, Tomoya Ishikawa, Hikaru Yamamoto, Toru Nakashima, Yasu ...
Session ID: 110
Published: 2007
Released on J-STAGE: May 30, 2007
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The authors thus employed the switch back welding method for welding V groove joints, from 2mm to 4mm root gap, without using backing plates.
In the weaving frequency of 10Hz, 5Hz and 2.5Hz, the relationship between the pulsed welding current and the back bead shape are investigated. The suitability of the welding conditions for each root gap was verified by observation of the arc, molten pool and external appearance of back beads.
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So Maruyama, Noriaki Iwabuchi, Shigeru Abe, Yasuyosi Kaneko
Session ID: 111
Published: 2007
Released on J-STAGE: May 30, 2007
CONFERENCE PROCEEDINGS
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In order to make each robot work efficently and to obtain the good welding quality,it is important to optimize the assignment of tasks of robots. In the paper,we propose an optimization or the welding assignment of some welding robots with the genetic algorithm. The position of welding works and robot arms is managed by multi dimensional data structures to shorten of processing time for the collison detection.
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Masahiro Shimada, Shigeru Nakayama, Masatsugu Takeichi, Yutaka Nakazaw ...
Session ID: 112
Published: 2007
Released on J-STAGE: May 30, 2007
CONFERENCE PROCEEDINGS
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Reporting on a newly developed "force control grinding robot system" for
automatization of weld bead grinding.
The system plans grinding tool path based on measured weld bead profile, then excutes grinding with force control.
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HIROHISA NODA, MASAKAZU SHIBAHARA, KOJI MASAOKA, HAYATO NAGAKI, SHINJI ...
Session ID: 113
Published: 2007
Released on J-STAGE: May 30, 2007
CONFERENCE PROCEEDINGS
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High current pulsed MAG welding was investigated in order to get the full penetration welding of T joints without back gouging. However, hot cracks were generated according to the welding conditions and the groove geometries in case that the plate thickness is 25mm over.
3D finite element method for hot crack using temperature dependent interface element (3D-TIFEM) can predict the formation and extension of hot crack in case of T joints. As experimental and computed results, the hot crack is hard to occur in condition of comparatively much heat input and back bead.
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TAKESHI NAKAGAWA, MASARU KONDO
Session ID: 114
Published: 2007
Released on J-STAGE: May 30, 2007
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When certain amount of hydrogen penetrates in weld, cold crack might occur near room temperature. Measurement method for diffusible hydrogen with predetermined test piece is standardized in JIS Z 3118, but cannot estimate quantity of diffusible hydrogen in actual welded joint.
Therefore, some sampling containers were produced experimentally and measurement method for diffusible hydrogen in welded joint was investigated with them.
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HIROYUKI HIRATA, TOMOHIKO OMURA, MITSUO MIYAHARA, KAZUHIRO OGAWA, TAKE ...
Session ID: 115
Published: 2007
Released on J-STAGE: May 30, 2007
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The effect of microstructure on hydrogen embrittlement of stainless steel weld metal was investigated. It was clarified that the susceptibility of hydrogen embrittlement was enlarged by increase of strain induced martensite. The other hand, that was not influenced by the delta-ferrite remained during solidification.
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Masahiko Hamada, Shuji Okaguchi, Yu-ichi Komizo
Session ID: 116
Published: 2007
Released on J-STAGE: May 30, 2007
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This report discusses the effect of boron addition on the toughness and microstructure of weld metal with the tensile strength from 700 to 1100 MPa. In the tensile strength range over 800MPa, weld metal without boron had higher absorbed energy than weld metal without boron. The weld metal without boron had more amount of acicular ferrite than the weld metal with boron in this tensile strength range.
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Kazuyoshi Saida, Tetsuro Ago, Kazutoshi Nishimoto, Kazuhiro Ogawa, Kaz ...
Session ID: 117
Published: 2007
Released on J-STAGE: May 30, 2007
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In order to develop the new filler metal for ultra high strength steels, rhe microstructural anlysis was carried out for the triplex stainless steel weld metal with ferrite+austenite+martensite phases. The kinetics of formation of retained austenite in the weld metal was analyzed by simulating the solidification segregation and martensitic phase transformation.
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Masato Michiuchi, Masanori Miyagi, Shin-ya Sato, Hiroyuki Kokawa, Zhan ...
Session ID: 118
Published: 2007
Released on J-STAGE: May 30, 2007
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The grain boundary engineering, which attracts much attention as a new method for improving material performance, was applied to austenitic stainless steels. The resulting steels indicated a very low connectivity of corrosion-prone boundary networks and a high corrosion resistance during ferric sulfate-sulfuric acid test.
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Study of solidification microstructure on austenitic weld metal (6)
Takahiro Osuki, Mitsuharu Yonemura, Kazuhiro Ogawa, Hiroyuki Hirata, Y ...
Session ID: 119
Published: 2007
Released on J-STAGE: May 30, 2007
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Verification of the modified numerical motel to predict the solidification microstructure of weld metal which is taken into account for d/g phase and NbC eutectic growth was investigated with using in-situ observation experiment of solidification process of weld metal by synchrotron radiation. Crystallization and growth behaviors of NbC on SUS347H weld metal was investigated by the developed numerical model.
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Microstructure control of titanium weld (report 1)
hidenori terasaki, yu-ichi komizo
Session ID: 120
Published: 2007
Released on J-STAGE: May 30, 2007
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In order to evolve the mechanical property of titanium weld-metal by controlling microstructure, understanding the microstructure formation including solidification and solid-state phase transformation is essential. In the present work, mechanism of solid-state phase transformation (beta-alpha phase transformation) under rapid cooling rate of welding was mainly discussed.
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Hitomi Nishibata, Masato Uchihara, Tamotsu Sasaki, Suguhiro Fukushima, ...
Session ID: 121
Published: 2007
Released on J-STAGE: May 30, 2007
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The weld abilities as materials for auto body of ultra fine-grained steel were examined.
It was thought that this steel has enough weld abilities to use as materials for auto bodies.
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Kazuhiro Kojima, Tadayuki Otani, Shigeru Ohkita, Susumu Tsukamoto, Gor ...
Session ID: 201
Published: 2007
Released on J-STAGE: May 30, 2007
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The effect of some alloying elements on porosity formation was investigated. Full penetration laser welding was carried out on 12mm thickness steels, With increasing C in the base metal, the porosity decreased more significantly. On the other hand, S enhanced the porosity formation.
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Nobuyuki Abe, Masahiro Tsukamoto, Naoyuki Nakamura, Junji Morimoto, Ju ...
Session ID: 202
Published: 2007
Released on J-STAGE: May 30, 2007
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Diode Laser,Fine Annealing,Barium Titanate,Dielectric Property
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Yoshinori Funada, Nobuyuki Abe, Masahiro Tsukamoto
Session ID: 203
Published: 2007
Released on J-STAGE: May 30, 2007
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In order to investigate an applicability of direct diode laser processing, the internal round edges of the inconel diaphragms with a thickness of 0.1mm used for welded bellows were tried to be welded with an elliptical beam from the diode laser. The welding was successful by optimizing the welding condition such as an irradiation angle.
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In-Su Woo, Bo-Young Jeong
Session ID: 204
Published: 2007
Released on J-STAGE: May 30, 2007
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The objective of this study is development of welding procedure to elevate the productivity and prevent the fracture of plate.
The main factor in deterioration laser welding quality with high carbon steel are hardening and making porosity at welded joint. We can improve the welding quality by the low carbon welding consumable, heat treatment and enforcing reduction in thickness.
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KENJI SAITA, YASUNOBU MIYAZAKI
Session ID: 205
Published: 2007
Released on J-STAGE: May 30, 2007
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Thickened aluminum was created near the interface by laser welding lap joint with no gap with use of aluminum coated steel sheet. this thickened aluminum was estimated Fe-Al intermetallic compound and resulted from the coated metal at the interface.
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Solidification process in SKD61
Tadafumi hashimoto, Hidenori Terasaki, Yu-ichi Komizo
Session ID: 206
Published: 2007
Released on J-STAGE: May 30, 2007
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In order to establish the YAG laser repair welding technique for precision die and mold, the solidification process was in-situ analyzed by Time-Resolved X-ray Diffraction system and the high temperature laser scanning microscope.
Typically solidification cracks were occurred during repair welding in SKD61.
The solidification mode also discussed from phase diagram by thermo-dynamic calculations.
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Yousuke kawahito, keisuke kinosita, masami mizutani, seiji katayama
Session ID: 207
Published: 2007
Released on J-STAGE: May 30, 2007
CONFERENCE PROCEEDINGS
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As fiber lasers have good beam quality, the beam light can be focused enough to reach super-power density similar to that in electron beam welding. This report showed that the power density produced what kind of influence on the welding results when bead-on-welding was exploited for stainless steel by using a 10 kW fiber laser beam. Moreover the latest data in high-speed observation results of the fiber laser welding phenomena was reported flowing the previous reports.
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Seo-Jeong Park, Jong-Do Kim, Woong-Seong Chang
Session ID: 208
Published: 2007
Released on J-STAGE: May 30, 2007
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This pontencialty that fiber laser has will be expected to be used for the automobile industry in the next generation. The present study performed the dissimilar welding between GA steel and Mg alloy by using fiber laser with the maxium output power 300W and investigated the characteristics of welding and behavior of key hole.
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Zhongjie LIU, Guojian XU, Muneharu KUTSUNA
Session ID: 209
Published: 2007
Released on J-STAGE: May 30, 2007
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2kW Fiber laser and 2.4 kW CO2 laser facilities were used to investigate those characteristics of laser welding and laser-MAG hybrid welding. The effect of defocusing distance and welding speed on the weld bead and plasma interaction were investigated. Fiber laser can achieve better weld bead than CO2 laser even at high welding speed in laser welding. It is well known that the plasma produced by laser affects penetration and bead width in laser-MAG hybrid welding. However, the plasma produced during fiber laser-MAG hybrid welding is small. On the contrary, the plasma produced during CO2 laser-MAG hybrid welding is very strong. The volume of plasma produced during hybrid welding is affected by laser-arc distance in laser-MAG hybrid welding. High energy density short wavelength fiber laser can couple with the arc completely than using long wavelength CO2 laser in laser-arc hybrid welding when the MAG power changed.
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Hisashi Matsuoka, Katsura Owaki, Hiroto Yamaoka, Seiji Katayama
Session ID: 210
Published: 2007
Released on J-STAGE: May 30, 2007
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In the welding of thin plates using the fiber laser,the spatter formation damage the optical system and there is a problem of welding construction instability. Then, the situation of the weld pool was observed by using the high speed camera and the laser light source, and the situation of the spatter formation in each construction condition was discussed.
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Muneharu Kutsuna, Hitoshi Ozaki, Mitsuhiro Yoshida, Shigeyuki Nakagawa ...
Session ID: 211
Published: 2007
Released on J-STAGE: May 30, 2007
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Laser Roll Welding of zinc coated steel and aluminum alloy by using a 2kW fiber laser was investigated, and the process parameters were studied. Otherwise, the influences of the process parameters on the weldability, the formation of intermetallic compound layer and the mechanical properties of joints.
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Tsuyoshi Matsumoto, Seiji Sasabe, Yasunori Hattori, Tadaaki Miono
Session ID: 212
Published: 2007
Released on J-STAGE: May 30, 2007
CONFERENCE PROCEEDINGS
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This report discribes the improvement for good joint efficiency on the dissimilar metal joints of 6000 series aluminum alloy to steel in the laser-braze-welding by using hot-dip aluminized steel sheet.
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Laser Roll Welding of Titanium and Aluminum Alloy (Report3)
Shingo Hayashi, Hitoshi Ozaki, Muneharu Kutsuna
Session ID: 213
Published: 2007
Released on J-STAGE: May 30, 2007
CONFERENCE PROCEEDINGS
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In conventional laser roll welding,brazing flux has been using for removing oxide films of aluminum alloy.In this study,joint of titanium and aluminum alloy was welded by laser roll welding without using brazing-flux,then effect of welding condition on the microstructures at interface and joint properties was invested.
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Kouji Nishimoto, Yoshihiro Okumoto, Tomoki Harano, Ken Atagi, Hiroo Fu ...
Session ID: 214
Published: 2007
Released on J-STAGE: May 30, 2007
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Recently, combinations of dissimilar materials are desired for better
functionality and performance, higher quality and reliability and weight reduction in industrial products.
In this study, laser pressure welding of Zn-coated steel and pure aluminum was carried out, and the relation between the intermetallic compound layer, joint strength and welding condition was examined.
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Guojian Xu, Akihiko Tsuboi, Takemitsu Ogawa, Takeshi Ikeda, Muneharu K ...
Session ID: 215
Published: 2007
Released on J-STAGE: May 30, 2007
CONFERENCE PROCEEDINGS
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The welding conditions, thickness of inter-metallic compound (IMC) near the interface and interface temperature on welding characteristics of the SPCC steel and A5052 aluminum alloy were investigated using a 3.0 kW diode laser-roll welding system. The optimal welding conditions are travel speed of 0.5-1.0 m/min, pressure stress of 200-220 MPa and laser power of 2.4-2.8 kW. Thereat, uniform thickness of IMC is 8.0-10.0 micrometer, and, heating temperature in the interface is over 1173 K.
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Laser-Assisted Metal-Plastic (LAMP) Direct-Joining (The Third Report)
seiji katayama, yousuke kawahito, yusuke niwa, akio tannge, syuuji kub ...
Session ID: 216
Published: 2007
Released on J-STAGE: May 30, 2007
CONFERENCE PROCEEDINGS
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Joints of the metal and plastic have been often used in several industries. We have newly developed a noble Laser-Assisted Metal and Plastic (LAMP) joining method unique in the world. This report showed that LAMP joing between polyethylene terephthalate (PET) and stainless steel produced desirable high-strength joints.
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Takuto YAMASHITA, Masahiro TSUKAMOTO, Yukihiro SOGA, Hitoshi NAKANO, T ...
Session ID: 217
Published: 2007
Released on J-STAGE: May 30, 2007
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Our study is to melt an edge of thin metal wire by All Around Laser Focusing (AALF) method. Using this method, laser focus on all side of an edge of thin metal wire. The metal is melted by this local heating.
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Kazutoshi Nishimoto, Kazuyoshi Saida, Masashi Sakamoto, Wataru Kono
Session ID: 218
Published: 2007
Released on J-STAGE: May 30, 2007
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The multipass laser overlay welding of alloy 690 was conducted in argon and under water by using YAG laser with La added filler metals. The effect of La addition on microcracking susceptibility in the multipass laser overlay-weld metal of alloy 690 was investigated.
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Effect of Direct Irradiation of Laser Beam on Wire Melting
Jing-bo Wang, Yoshiaki Takenaka, Hitoshi Nishimura, Kouji Fujii, Seiji ...
Session ID: 219
Published: 2007
Released on J-STAGE: May 30, 2007
CONFERENCE PROCEEDINGS
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Laser-MIG hybrid welding of aluminum alloy has been conducted by setting laser beam and wire separately, conventionally, to avoid interference of laser beam and arc. In this report, the authors reported a method by which laser beam was directly irrated across the wire in order to reduce arc current at a same wire feeding rate.
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Noboru Kiji, Eiichi Tamura, Tomokazu Nakagawa, Naohiro Furukawa, Masan ...
Session ID: 220
Published: 2007
Released on J-STAGE: May 30, 2007
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Behavior of brittle crack arrest in T-joint structure was investigated using large-size specimen.
Effect of un-welded zone of fillet welded joint on brittle crack arrest was confirmed.
In addition, primary effect of material property on full penetration T-joint was studied.
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Takanori Kitamura, Keisuke Samejima, Toshio Terasaki, Shinsuke Takemur ...
Session ID: 221
Published: 2007
Released on J-STAGE: May 30, 2007
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This paper deals with examining the relation between strength of steel plate and pattern of laser weld bead by the experiment and the numerical analysis. And it is clarified the appropriate method of making lap joint.
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Takumi Ishii, Satoshi Nakagawa, Tokihiko Kataoka, Rinsei Ikeda
Session ID: 222
Published: 2007
Released on J-STAGE: May 30, 2007
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CO2 gas shielded arc welding
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Takumi Ishii, Satoshi Nakagawa, Tokihiko Kataoka, Rinsei Ikeda
Session ID: 223
Published: 2007
Released on J-STAGE: May 30, 2007
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CO2 gas shielded arc welding
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Junko KANBAYASHI, Koutarou INOSE, Yasumasa NAKANISHI
Session ID: 224
Published: 2007
Released on J-STAGE: May 30, 2007
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In the weld joint of the existing structure, a lot of weld joints by the partial penetration exist although the full-penetration welds should be.
Then, the penetration size to ensure the base metal strength was found and the repairing parts and the heat input of the repair welding would be reduced.
From the tensile test results of cross-joint welds, it was found that the strength of the weld joints had the enough strength equivalent to the base metal, when the penetration was one fourth of the thickness of the base metal.
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Osamu Yasuda, Shinji Takaba, Yasumitsu Morishita, Hayato Nagaki, Kazus ...
Session ID: 225
Published: 2007
Released on J-STAGE: May 30, 2007
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Fatigue cracks which pass through the deck plate or weld metal from weld root are reported in the case of steel plate deck bridges. Fatigue tests for Fatigue Proof steel (FCA) has been experimented for the purpose of arresting the crack from weld root which were 75% penetration for U-rib thickness in the deck plate.
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Osamu Yasuda, Yasumitsu Morishita, Shinji Takaba, Tatuya Yamano, Kazus ...
Session ID: 226
Published: 2007
Released on J-STAGE: May 30, 2007
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Fatigue Proof steel (FCA) has been applied to bridges (steel plate girders) for the first time in the world. Non-load cruciform fatigue tests for welding joint and CT tests for base metal have been carried out. Also welding procedure test for this steel shall be reported.
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Study on steel welded joint with shot peening scavenging
Masayosi Hasegawa, Hiroaki Suzuki, Ken Miura
Session ID: 227
Published: 2007
Released on J-STAGE: May 30, 2007
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Board thickness used steel ball shot materials of average particle size 0.6mm in a weld zone after MAG arc welding a rolling steel sheet (SM490A) for welding of 6mm and it processed shot peening and scavenging did a weld and I shall have done hot galvanizing afterwards and examined fatigue strength about the thing which there was not.
As a result,the strength of the coupling which it did not plate only by shot peening processing was improved remarkably, but it became clear I compared it with the thing which I did not plate,and to fall when it performed hot galvanizing.
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Hiroki Inoue, Guojian Xu, Muneharu Kutsuna, Kazuo Amano, Sano Yuji
Session ID: 228
Published: 2007
Released on J-STAGE: May 30, 2007
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In the study, the effect of Laser peenenig process on the fatigue strength, Vickers hardness, and residual stress of aluminum alloy MIG welded joint. The following results were confirmed: (1)fatigue strength of aluminum alloy welded joint were improved by laser peening; (2)surface hardness of aluminum alloy welded joint were improved as high as that of the base metal; (3)compressive residual stress were developed at the weld toe of aluminum alloy welded joint.
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Manabu TANAKA, Shinichi TASHIRO, Masakazu SHIBAHARA, Kazushi TANAKA, Y ...
Session ID: 301
Published: 2007
Released on J-STAGE: May 30, 2007
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The whole region of oxygen plasma jet, namely, a hafnium electrode as a cathode buried in the water-cooled copper sheath, an arc plasma and a copper nozzle as an anode is treated in a unified numerical model. Calculations are made for the two-dimensional distributions of temperature and fluid flow velocity in the whole region of the oxygen plasma jet for a 400 A in arc current.
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