• Title/Summary/Keyword: Electron beam welding

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Weldability of Pure Titanium Thin plate for LPG Re-Condenser by Nd:YAG Laser - Physical Constant and Welding Parameter - (LPG 재응축기용 순티타늄 박판의 Nd:YAG 레이저 용접성(I) - 순티타늄의 물성과 용접변수 -)

  • Kim, Jong-Do;Gwak, Myeong-Seop;Lee, Chang-Je;Kim, Chang-Su
    • Proceedings of the KWS Conference
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    • 2007.11a
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    • pp.363-365
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    • 2007

  • Titanium and its alloys have excellent corrosion resistance, high strength to weight ratios and high temperature creep properties, which make them using many various fields of application. Responding to these needs, welding processes for titanium are also being used including TIG, MIG, resistance welding, plasma arc welding, diffusion welding, electron beam welding and laser welding. In this study, It is possible to get sound beads without humping bead and spatter with the decrease of peak power according to increase of pulse width and change of welding speed for heat input control at pulsed Nd:YAG laser welding of titanium plates for Lap welding.

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A Study on Electron Beam Weldmetal Cross Section Shapes and Strength of Al 5052 Thick Plate (Al 5052 함금 후판재의 전자빔 용접부 단면 형상과 강도에 관한 연구)

  • Kim, In-Ho;Lee, Gil-Young;Ju, Jeong-Min;Park, Kyoung-Tae;Chun, Byong-Sun
    • Journal of Welding and Joining
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    • v.27 no.3
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    • pp.73-79
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    • 2009

  • This present paper investigated the mechanical properties and the microstructures of each penetration shapes classifying the conduction shape area and the keyhole shape area about electron beam welded 120(T)mm thick plated aluminum 5052 112H. As a result the penetration depth is increased linearly according to the output power, but the aspect ratio is decreased after the regular output power. In the conduction shape area, the Heat affected zone is observed relatively wider than the keyhole shape area. In the material front surface of the welded specimen, the width is decreased but the width in the material rear surface is increased. After the measuring the Micro Vikers Hardness, it showed almost similar hardness range in all parts, and after testing the tensile strength, the ultimate tensile strength is similar to the ultimate tensile strength of the base material in all the specimens, also the fracture point was generated in the base materials of all the samples. In the result of the impact test, impact absorbed energy of the Keyhole shape area is turned up very high, and also shown up the effect about four times of fracture toughness comparing the base material. In the last result of observing the fractographs, typical ductile fraction is shown in each weld metal, and in the basic material, the dimple fraction is shown. The weld metals are shown that there are no other developments of any new chemical compound during the fastness melting and solidification.

  • https://doi.org/10.5781/KWJS.2009.27.3.073 인용 PDF KSCI

STATUS OF WELDING FOR POWER PLANT FACILITIES

  • Hur, Sung-do
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.342-348
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    • 2002

  • The welding technology for production of power plant facility as for other industries has been progressing forward automation and mechanization for cost reduction and shortening of cycle time. The welding for boiler tube is automated or mechanized as the parts and subassemblies of tubes are conveyed automatically in the shop. The temperature of boiler stearn is being progressively increased for higher plant efficiency. The welding of nuclear component is characterized by heavy thickness and narrow gap Submerged Arc Welding. Narrow gap Gas Metal Arc Welding and Electron Beam Welding is applied to turbine diaphragm. To improve the resistance of solid particle erosion of turbine blade and nozzle partition, HVOF spray technology and boriding process has been applied.

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