QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
PRINT ISSN: 0288-4771

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 32 (2014), No. 1

  • Novel Dissimilar Spot Welding of Aluminum Alloy and Steel Sheets by Friction Stirring

    pp. 1-7

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2207/qjjws.32.1

    Friction Stir Spot Welding (FSSW) has been applied to a dissimilar metal lap joint of an aluminum alloy and steel by stirring only the upper aluminum alloy sheet. Therefore, FSSW cannot be used to weld a lap joint composed of three or more sheets and a lap joint with an adhesive interlayer. In the present work, we propose a novel spot welding process for dissimilar metal lap joints using a new tool with the tip made of spherical ceramics. When this process is applied to the lap joint of the aluminum alloy and steel, the tool can be plunged into the lower steel sheet, then a steel projection is formed in the aluminum alloy sheet. The height of this steel projection increases with the plunge depth, and accordingly, the weld strength increases; the tensile shear strength and the cross tensile strength reached about 3.6 kN/point and 2.3 kN/point, respectively.
  • Development of Manufacturing Technology of Radial Plate in Superconducting Coil for Fusion Reactor by Diffusion Bonding by Hot Isostatic Pressing (HIP)

    pp. 8-14

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2207/qjjws.32.8

    The radial plates (RPs), which is used in Toroidal field (TF) coil in ITER, are quite large, such as 13 m tall and 9 m wide, but thin, such as 10 cm thick, and are made of stainless steel. Even though they are very large structures, they require very high manufacturing tolerances and high mechanical strength at 4 K. The similar requirements will be required in the next generation fusion reactor. Therefore, the authors intend to develop efficient manufacturing methods in parallel with ITER TF coil RP manufacture. The authors therefore performed trial manufacture of the RP segments using a diffusion bonding method, namely Hot Isostatic Pressing (HIP). As a result of trials, it was clarified that even when HIPping is applied, the mechanical characteristic of base metal is not deteriorated. The machining period can be reduced by about 1/3 compared with the traditional manufacturing method. On the other hand, mechanical strength at 4 K is degraded due to weak bonding, that is no grain growth through joint, by HIPping. However, additional test indicates promising possibility of much better joint by higher temperature and joint surface treated HIPpings. These results justified that RP segment manufacturing is not only possible, but it is a technically valid manufacturing method that satisfies all requirements.
  • Clarification of Defect Formation Mechanism in Friction Stir Welding by X-ray Radiography

    pp. 31-37

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2207/qjjws.32.31

    Defect formation mechanism during friction stir welding (FSW) was investigated by three-dimensional visualization of material flow around a tool. The three-dimensional flow patterns in various FSW conditions were obtained using two pairs of x-ray transmission real-time imaging systems. It revealed that the tilt of the horizontal material flow around the tool and the stagnation of the material flow at retreating side of the tool were tightly connected with the defect formation mechanism. Additionally, the material flow rates during FSW were directly calculated by the results of the three-dimensional visualization. The material flow rate at advancing side was obviously decreased in the defect formation process conditions.
  • Laser Brazing of Dissimilar Joint of Austenitic Stainless Steel and Pure Copper

    pp. 38-46

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2207/qjjws.32.38

    In many industries, there are applications that require the joining of stainless steel and copper components; therefore, the welding of dissimilar stainless steel/copper joints is a common process. For this investigation, the optimal brazing conditions and suitable filler metals for laser brazing of stainless steel/copper lap joints were studied. Tensile shear force increases with increases in the laser spot diameter or in the laser irradiation angle, which is associated with increased bonding width; however, as bonding width approaches 2 mm, tensile shear force reaches a saturated value due to fracturing at the HAZ of the Cu base plate. In order to obtain joints with high tensile shear strength, laser brazing was optimized by using Cu-Si-based filler metal under the following conditions: laser power: 4 kW; spot diameter: 3mm; laser irradiation angle: 80 degrees; irradiation position shift: 0.6 mm; brazing speed: 0.30 m/min; and filler metal feed speed: 0.30 min. Concerning filler metals, it was found that the Ni-Cu type showed relatively large tensile shear force even at high welding speeds in comparison with those of the Cu-Si, Cu, Cu-Ni, Ni-Cu and Ni types, respectively.
    x

    Readers Who Read This Article Also Read

    1. Oblique laser irradiation technique for vertical welding of thick steel plates employing hot-wire laser welding QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol.33(2015), No.4
    2. Phenomena in GTA and GHTA Welding under like Mars Atmosphere QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol.32(2014), No.2
    3. Analysis of dynamic plasma behaviors in gas metal arc welding by imaging spectroscopy QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol.33(2015), No.2

Article Access Ranking

22 Mar. (Last 30 Days)

  1. Dependence of Carbon Concentration and Alloying Elements on the Stability of Iron Carbides ISIJ International Advance Publication
  2. Comprehensive Optimization Control Technology of Rolling Energy and Oil Consumption in Double Cold Rolling ISIJ International Advance Publication
  3. Experiments on Removal of Hydrophilic Fine Particles in Bubbly Flow ISIJ International Vol.59(2019), No.2
  4. Effects of Impurities and Processing Conditions in Al–1%Mn Alloys on the Formation of Thermally Stabilized Substructures MATERIALS TRANSACTIONS Vol.59(2018), No.11
  5. Temperature Field Distribution of a Dissected Blast Furnace ISIJ International Advance Publication
  6. Coating Film Profiles Generated by Fluctuating Location of the Wiping Pressure and Shear Stress ISIJ International Vol.59(2019), No.2
  7. Evolution of Blast Furnace Process toward Reductant Flexibility and Carbon Dioxide Mitigation in Steel Works ISIJ International Vol.56(2016), No.10
  8. Effect of EAF Slag Temperature and Composition on its Electrical Conductivity ISIJ International Vol.59(2019), No.2
  9. Fundamentals of Silico-Ferrite of Calcium and Aluminium (SFCA) Iron Ore Sinter Bonding Phase Formation: Effects of Basicity and Magnesium on Crystallisation during Cooling ISIJ International Vol.59(2019), No.2
  10. Effect of Nut Coke Addition on Physicochemical Behaviour of Pellet Bed in Ironmaking Blast Furnace ISIJ International Advance Publication

Search Phrase Ranking

22 Mar. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. galvanizing
  5. tuyere abrasion
  6. 鉄と鋼
  7. tuyere erosion
  8. isij
  9. lme
  10. tuyere failure