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Dai NAKAMA, Kazuyoshi KATOH
Session ID: 101
Published: 2008
Released on J-STAGE: April 18, 2008
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Alumina particle in aluminum alloy composite material was made by the friction surfacing. Effect of the surfacing conditions on structure and mechanical properties of deposit were investigated.
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TAKANAO TANAKA, DAISUKE NAGAE
Session ID: 102
Published: 2008
Released on J-STAGE: April 18, 2008
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To inprove the mechanical properties of stellite-deposited layer on SNCM815, we utilized a salt bath as a means of quenching. As a result, the microstructure and the mechanical properties have improved.
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- Effects of Welding variables on the White spot formation -
Heekeun Lee, Jinyong Kim, Manju Huh
Session ID: 103
Published: 2008
Released on J-STAGE: April 18, 2008
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White spots occurred on the autogenous GTAW welds of Fe-36% Ni alloy plates. This paper covers the analysis results of the white spots formation as changing welding variables.
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Minhyo SHIN, Kazuhiro NAKATA
Session ID: 104
Published: 2008
Released on J-STAGE: April 18, 2008
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The effect of process parameters of the fiber laser and MAG arc hybrid welding on weld bead formation of 12 mm thickness SM490 has been studied. In order to evaluate a relationship between the parameters and weld characteristics, groove angle, gap width, arc current and distance of the two heat sources were changed. Sound beads without spatter and porosity could be achieved by the hybrid welding.
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Jing-bo Wang, Hitoshi Nishimura, Seiji Katayama, Masami Mizutani
Session ID: 105
Published: 2008
Released on J-STAGE: April 18, 2008
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In laser-MIG arc hybrid welding of aluminum alloy, at which a laser beam was directly irradiated on wire surface, the effect of laser parameters on wire melting characteristics of A4043 wire was discussed by comparing with A5356 wire. It was found that A4043 wire was more difficult to be evaporated by laser irradiation than A5356 did because of the fact that there was only Si in A4043 wire.
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Hitoshi Nishimura, Jing-bo Wang, Seiji Katayama, Masami Mizutani
Session ID: 106
Published: 2008
Released on J-STAGE: April 18, 2008
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In laser-arc hybrid welding of aluminum alloy with filler addition except for the wire for MIG arc welding, the melting characteristics of the filler added was studied. It was found that sound bead appearance could be obtained among a wide range of filler feeding rates. Also, it was found this method useful for increasing gap tolerance of butt joints.
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Lin Zhao, Susumu Tsukamoto, Goro Arakane
Session ID: 107
Published: 2008
Released on J-STAGE: April 18, 2008
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In this paper, the effect of the oxygen on the distribution of the wire feeding elements was investigated by changing the oxygen content in the shielding gas in CO2 laser and pulsed GMA hybrid welding. The experimental results indicate that the distribution of the alloying elements in the weld is more homogenous with the increase of the oxygen content.
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Lina Yu, Kazuhiro Nakata
Session ID: 108
Published: 2008
Released on J-STAGE: April 18, 2008
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The weldability of thixo-molded Mg alloy sheets welded by using a new Fiber Laser Welding (FBLW) with different welding parameters was studied. The experimental results show that the magnesium alloys can get better welding appearance at higher welding speed (6 or 10 m/min) with 5kw laser power. Quantities of porosity defect occurred in the fusion zone, and the defect decreased with increasing the welding speed, together with narrower width of fusion zone. Furthermore, N2 is the major gas in the porosity both in the base metals and in the weld metals, while AE42 alloy includes higher content of H2 in the weld metal than AS41 alloy, which is proportional to the content in the base metal. The presence of gas inclusion in the base metal is the main factor contributing to the formation of porosity.
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naoyuki matsumoto, yousuke kawahito, seiji katayama, masami mizutai
Session ID: 109
Published: 2008
Released on J-STAGE: April 18, 2008
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High-tensile strength steel is used for various structural materials, but their laser welding phenomena is not clarified sufficiently. In this study, welding results of high-tensile strength steel with high power fiber laser are investigated with high speed video observation to understand welding phenomena.
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Characteristic of Direct Diode Laser
HIROFUMI MIYAJIMA, HIROFUMI KAN, KATSUHIKO SATO, MASAKI WATANABE, TOMO ...
Session ID: 110
Published: 2008
Released on J-STAGE: April 18, 2008
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A direct diode laser that uses laser diode light directly has been ecpected for the thermal processing . In this report, the characteristics of high power direct diode laser which was newly developed is described.
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Laser Weldability of Steel Sheets for automobile body
MASANORI YASUYAMA, KIYOYUKI FUKUI, HIROFUMI MIYAJIMA, HIROFUMI KAN, KA ...
Session ID: 111
Published: 2008
Released on J-STAGE: April 18, 2008
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The weldability and joint's performance for automobile steel sheets
were studied using newly developed high power direct diode laser.
The weld shape suggests the existence of keyhole in welding.It was shown to obtain the characteristic equal with the conventional YAG laser.
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Eiji Ashida, Xudong Zhang, Seiji Katayama, Masami Mizutani
Session ID: 112
Published: 2008
Released on J-STAGE: April 18, 2008
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A gas-jet nozzle was used to improve the penetration in laser welding,and the relationship between the gas flow condition and the penetration was investigated.
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Yuta Yamamoto, Sosyu Kirihara, Yoshinari Miyamoto
Session ID: 113
Published: 2008
Released on J-STAGE: April 18, 2008
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Three-dimensional micro welding is a novel freeform fabrication method for metals. Micro beads are welded continuously by TIG micro welder and built up under the control of computer system, eventually forming a metal object. In this study, we fabricated Functionally Graded Materials in the system of WC-Co/SUS304.
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Kensuke Yoshiyama, Satoshi Yamane, Yasuyoshi Kaneko, Kenzi Ohshima
Session ID: 114
Published: 2008
Released on J-STAGE: April 18, 2008
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Although the switch back welding method which was adapted for gap variation in narrow gap welding was applied and stable back bead was obtained, it is not solved what kind of welding phenomenon has occurred. Then, numerical simulation investigates the heat distribution of weld pool and the validity of switch back welding at the narrow gap welding is checked.
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Manabu Koizumi, Satoshi Yamane, Yasuyoshi Kaneko, Kenji Ohshima
Session ID: 115
Published: 2008
Released on J-STAGE: April 18, 2008
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By presuming welding voltage using a neural network, unusual voltage decreases sputter generated owing to, and aims at performing quality welding.
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Tetsuo Yoshida, Satoshi Yamane, Toru Nakajima, Hikaru Yamamoto, Kenji ...
Session ID: 116
Published: 2008
Released on J-STAGE: April 18, 2008
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The digital cooperative control system which applied the computer network was developed, and it aims at performing high quality welding by using this system.
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Hiroshige Inoue, Daisuke Ohmura, Isamu Kimoto, Shota Shibasaki
Session ID: 117
Published: 2008
Released on J-STAGE: April 18, 2008
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Though solid wires are generally applied to TIG welding, the flexibility of the composition design is not so easy. We developed the flux/metal cored wires for TIG welding. In this presentation, we will report the weldability of them.
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Makoto Takahashi, Yuichiro Enatsu, Toyoyuki Sato
Session ID: 118
Published: 2008
Released on J-STAGE: April 18, 2008
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One of the problems for Tandem GMA welding with mild steel is large amount of spatter. In our experiment, we examined shielding gas compositions which affect spatter amounts. By using the appropriate gas composition for each electrode, we could decrease spatter amounts.
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The Establishment of Standard Application Condition
TADAHISA TSUYAMA
Session ID: 119
Published: 2008
Released on J-STAGE: April 18, 2008
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I studied a application of Tandem Electogas Arc Welding Method on built box column thick corner joint. I grope for the standard application condition that high mechanical performance was provided. As a result, I confirmed the optimum condition range where a weld with no defect and high mechanical performance was provided.
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KEI YAMAZAKI, KEIICHI SUZUKI, FUSAKI KOSHIISHI
Session ID: 120
Published: 2008
Released on J-STAGE: April 18, 2008
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In globular transfer of CO2 gas shielded arc welding, low spatter and fume welding process has been studied by focusing on the wave form control of welding current and the chemical compositions of solid wire. As a result, spatter genaration rate is reduced by 40%,fume genaration rate is reduced by 20% in comparison of that the conventional CO2 arc welding.
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Yoshinari Ishida, Shinji Kodama, Kenichi Asai, Manabu Mizumoto, Takash ...
Session ID: 121
Published: 2008
Released on J-STAGE: April 18, 2008
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The stainless steel flux-cored wire for zinc-based alloy coated
steel sheet was developed. In order to improve the usability of the
welding wire, the influence of slag components on the spatter
generation and the bead appearance was evaluated. In addition, a
relatively-thin wire was examined to stabilize the droplet transfer
in low current welding.
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Tooru Iijima, Yutaka Mizo, Kazuyuki Kobayashi, Manabu Mizumoto, Hajime ...
Session ID: 122
Published: 2008
Released on J-STAGE: April 18, 2008
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Development of Submerged arc welding in Vertical Up position
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A study on welding consumables for 9%Ni steel
Manabu Mizumoto, Ryuichi Motomatsu, Hajime Nagasaki, Tooru Iijima, Yut ...
Session ID: 123
Published: 2008
Released on J-STAGE: April 18, 2008
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We started the development of Submerged arc welding materials in vertical up position to plan high efficiency of the welding in site.Application steel is 9% Ni steel for the LNG tanks.As a result of wire and flux examination, we developed the materials that good bead shape and defect characteristics-resistant were good.
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Uceu Suhuddin, Yutaka Sato, Hiroyuki Kokawa
Session ID: 201
Published: 2008
Released on J-STAGE: April 18, 2008
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Effect of tool shoulder diameter on texture formation during friction stir welding of Al alloy 6016, 2mm in thickness, was examined. The small shoulder diameter resulted in shear defomation texture along the pin surface in the stir zone. An increase in shoulder diameter changed from shear along the pin surface into that along the shoulder surface. The large diameter left static recrystallization texture.
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Daisuke Watanabe, Mitsuo Fujimoto
Session ID: 202
Published: 2008
Released on J-STAGE: April 18, 2008
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Friction spot joining (FSJ) is now apply for automotive industries mainly for lap joints of thin plate.
I studied the FSJ tool geometry factor which effects tensile strength because we need to design the best FSJ tool geometry to get large tensile strength and good joint condition.
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Mitsuo Fujimoto, Daisuke Watanabe
Session ID: 203
Published: 2008
Released on J-STAGE: April 18, 2008
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Effects of the thread of the tool in Friction Spot Joining was investigated. Enough joint strength was obtained with A6061 by the tool with/without thread. Plastic flow of the rotating direction was suggested for the main factor of the joint mechanism by the thread-less tool.
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Hidetoshi Fujii, Kouichi Imagawa, Yasufumi Yamaguchi, Shoji Kiguchi, K ...
Session ID: 204
Published: 2008
Released on J-STAGE: April 18, 2008
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Friction Stir Processing was performed for cast iron to improve the mechanical properties such as hardness. The effect of the tilt angle was examined to optimize the welding conditions.
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Yoshiro KONISHI, Hidetoshi FUJII, Kazuhiro NAKATA, Kiyoshi NOGI
Session ID: 205
Published: 2008
Released on J-STAGE: April 18, 2008
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Friction stir welding was performed with a laser as a preceding heat source for a carbon steel to increase welding speed and to decrease the load under various conditions. The effect of the heat input on the microstructures and mechanical properties of joints was investigated.
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Katashi Miyagawa, Keitaro Miyagawa, Masami Tsubaki, Toshiaki Yasui, Ma ...
Session ID: 206
Published: 2008
Released on J-STAGE: April 18, 2008
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In friction stir welding, temperature at weld interface influences generated intermetalic compound. In this study, temperature at weld interface, which are calculation value and measured value, was compared, and effect between temperature and intermetalic compound is considered.
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Ryoji Ohashi, Mitsuo Fujimoto
Session ID: 207
Published: 2008
Released on J-STAGE: April 18, 2008
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This is basic sturdy on Friction Spot Joining tool for steel. Tool used for experiment was made of Silicon Nitride and had threaded probe. Endurance test of Tool was done with mild steel and lifetime of tool and reason of wear were investigated. As a results, coating on tool is very effective way to improve.
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Sergey Mironov, Ryoji Ohashi, Mitsuo Fujimoto, Yutaka Sato, Hiroyuki K ...
Session ID: 208
Published: 2008
Released on J-STAGE: April 18, 2008
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Microstructural development in DP590 steel during friction spot joining was examined. The martensitic structure was observed in the vicinity of the exit hole of the welding pin. It was suggested that the martensitic transformation was subjected to N-W crystallographic orientation relationship.
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Yu Zhang, Yutaka Sato, Hiroyuki Kokawa, Seung Hwan Park, Satoshi Hiran ...
Session ID: 209
Published: 2008
Released on J-STAGE: April 18, 2008
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Friction stir welding was applied to commercial-purity titanium, and then the microstructure was systematically examined in the weld.
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Yoshimitsu KANO, Kazuyoshi KATOH
Session ID: 210
Published: 2008
Released on J-STAGE: April 18, 2008
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Lap welding of SPCC steel plate of 1 mm in thickness was done by friction spot welding. The microstructures and mechanical properties of lap joint were investigated.
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Ting Huang, Yutaka Sato, Hiroyuki Kokawa, Michael Miles, Kohkonen Kent ...
Session ID: 211
Published: 2008
Released on J-STAGE: April 18, 2008
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Multibody joining, that is a new solid-phase joining process using consumable tool, was applied to DP980 steel, and then microstructure associated with hardness was examined in the weld.
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Masakazu Kikuchi, Mitsuru Nakamura, Takashi Umemura
Session ID: 212
Published: 2008
Released on J-STAGE: April 18, 2008
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Frction Welding's Characteristics between Cemented Carbides and High Speed Steels
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Sato Yutaka, Akihiro Sugimoto, Kokawa Hiroyuki, Ki-Su Kwon, Chang-Woo ...
Session ID: 213
Published: 2008
Released on J-STAGE: April 18, 2008
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Effect of microstructure, especially grain size and crystallographic texture, on formability in friction stir processed AZ31B magnesium alloy was examined.
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TAKESHI ISHIKAWA, HIDETOSHI FUJII, KAZUO GENCHI, SHUNICHI IWAKI, SHIGE ...
Session ID: 214
Published: 2008
Released on J-STAGE: April 18, 2008
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Some studies on the friction stir welding of high temperature materials have recently been reported, although their practical use has not yet occurred due to some problems to be solved such as decreases in the corrosion resistance and joint efficiency during a high-speed joining. The purpose of this study is to clarify the effect of the welding speed on the joint efficiency. As a result, it has been clarified that at a rotational speed of 600 rpm, the friction stir welding of 304 austenitic stainless steel is possible without any defects up to the joining speed of 1200mm/min, and the tensile strength of the joint exceeds that of the parent material up to the joining speed of 1000mm/min. In addition, the corrosion resistance is significantly improved at the higher welding speeds.
Thus, an increase in the welding speed can improve productivity and the product quality by decreasing corroded region. These results are expected to extend to an actual application to products by further improving the technology.
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Yingchun Chen, Takuya Tsumura, Kazuhiro Nakata
Session ID: 215
Published: 2008
Released on J-STAGE: April 18, 2008
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AC4C aluminum alloy and zinc-coated steel were friction stir lap welded, and the effect of insert depth of tool on microstructure and mechanical properties of the joints were investigated. Experimental results show that the insert depth of tool has a significant effect on mechanical properties of joints. For normal insert joints (the probe of tool does not touch the surface of steel), the joints fracture at the interface. For deep insert joints (the probe is inserted into the steel), the joints fracture at the steel base material side and the failure load is equal to that of steel base metal. The change of fracture location is attributed to the disappearance of the heavy lamellar intermetallic compounds (IMC) layer at the joining interface by the stir behavior of tool. The effect of insert depth of tool on the morphology and distribution of IMC layer was discussed.
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Yoshiaki Morisada, Hidetoshi Fujii, Toru Nagaoka, Masao Fukusumi, Masa ...
Session ID: 216
Published: 2008
Released on J-STAGE: April 18, 2008
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Microstructural control of tool steel was studied. Nanometer-sized microstructure was successfully fabricated by the combination of laser treatment and friction stir processing.
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Toshiaki Yasui, Masaya Kuwahara, Masami Tsubaki, Masahiro Fukumoto
Session ID: 217
Published: 2008
Released on J-STAGE: April 18, 2008
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Dissimilar metal welding between aluminum and steel by friction stirring achieve high welding speed and high joining efficiency. In this welding, the tool probe plunged into the aluminum and the probe surface slightly grinded the steel surface during welding. The tool movements effect on the material flow during the welding. We investigated the material flow by measuring the three-dimensional forces acting on the weld joint and the temperature of weld interface during welding. We also observed the material flow by X-ray CT technique. From these results, we evaluated material flow in the dissimilar metal welding by friction stirring.
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Kinya Aota, Kenji Ikeuti
Session ID: 218
Published: 2008
Released on J-STAGE: April 18, 2008
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Friction stir seam welding of aluminum by rotating tool without probe was studied. Aluminum thickness is 0.5mm. It was possible to weld without purobe hole at end of the welding.
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Masatoshi Aritoshi, Takeshi Nakajima, Kunihiro Tani, Mitsuji Ueda, Tor ...
Session ID: 219
Published: 2008
Released on J-STAGE: April 18, 2008
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Tensile shear fatigue strength of friction stir spot welded joint of noncombustible magnesium alloy sheets is investigated. No significant effects of sheet thickness on fatigue life were revealed. Observation at fracture surface showed that fracture occurred at button region.
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Shohei Horie, Kenji Shinozaki, Motomichi Ymamoto, Adrian Gerlich, Tosh ...
Session ID: 220
Published: 2008
Released on J-STAGE: April 18, 2008
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This paper examined local melting in Mg-Al binary alloy Friction Stir Spot Welding.
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Lina Yu, Kazuhiro Nakata
Session ID: 221
Published: 2008
Released on J-STAGE: April 18, 2008
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The weldability of thixo-molded AS41 Mg alloy sheets welded by using Friction Stir Welding (FSW) under different welding conditions was studied. The appropriate FSW condition range of several kinds of Mg alloys is given, and it seems that the appropriate FSW condition range increases with decreasing the Al content in the Mg alloys. Grains of base metal have been deformed greatly after friction stirring, and the hardness of SZ is higher than that of base metal. The tensile strength and elongation of all-SZ specimen of AS41 alloy increased with decreasing the welding speed and increasing the rotation speed.
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Yoji Ogawa, Tomio Sato, Hidetoshi Ueno
Session ID: 222
Published: 2008
Released on J-STAGE: April 18, 2008
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SOme percent of calcium is conmined into magnesium alloy to improve against combustion affair. TIG arc Welding of Noncombustible Magnesium Alloy was carried out to develope suitable welding wire composit to keep noncombustible quality.
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Kan WATANABE, Toshikatsu ASAHINA, Kaoru HASUMI
Session ID: 223
Published: 2008
Released on J-STAGE: April 18, 2008
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In this study, pure titanium (Grade 2) and 5052 aluminum alloy has been lap-welded by pulsed YAG laser using pure zirconium and pure nickel sheets as insert metals. Welded joints were estimated by hardness distribution, tensile tear test, and EPMA line analyse on fusion zone.
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Masayuki SERINO, Shuhei NAGATA, Tomiko YAMAGUCHI, Kazumasa NISHIO
Session ID: 224
Published: 2008
Released on J-STAGE: April 18, 2008
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In this study, we assumed thatstud bolts were used for welding of aluminum bronze and the structural steel and investigated the weldability of aluminum bronze and stainless steel. In particular, influence of straight polarity and/or reverse polarity on a weld characteristic was investigated.
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Toshihiko Fukuda, Masaki Kumagai, Keizo Namba
Session ID: 225
Published: 2008
Released on J-STAGE: April 18, 2008
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In this study, MIG welding process between aluminum and steel sheets was selected, where GA steel was included for the parent materials. Properties of joints were researched in appearances of welds, the new tests developed in order to focus on interface properties between weld metal and steel sheets, and also observation of micro structures.
This paper sketched out properties of lap joints between aluminum and GA sheets as one part of our studies.
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Koji Nishimoto, Tomoki Harano, Yoshihiro Okumoto, Ken Atagi, Hiroo Fuj ...
Session ID: 226
Published: 2008
Released on J-STAGE: April 18, 2008
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In previous report, laser pressure welding of GA Steel and A1050 was examined. The influence of the intermetallic layer on the joint strengths was evaluated, and the welding conditions for good bonding-ability were established.
In this study, the TEM observation of the compound layer was carried out to examine the above reason for the production of high strength joints even in the case of the thick compound layer.
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Study on Dissimmilar Laser Brazing of Titanium Alloys and Stainless Steels (Report 2)
Hiroaki MORI, Miku MORITA, Kazuyoshi SAIDA, Kazutoshi NISHIMOTO, Naoyu ...
Session ID: 227
Published: 2008
Released on J-STAGE: April 18, 2008
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In the case of dissimilar laser brazing of titanium alloys and stainless steels with silver-base brazing materials, molten brazing materials enter into the gap of butt joints by using the flux. The contact angles of molten brazing materials and these base matrials for each temperatures had been measured. The filling behavior of molten brazing materials into the gap was calculated by the software "FLOW-3D" with measeured contact angles. The behavior calculated was consistent with the experimental one.
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