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QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 41 (2023), No. 4

ISIJ International
belloff
ONLINE ISSN:
PRINT ISSN: 0288-4771
Publisher: JAPAN WELDING SOCIETY

Backnumber

  1. Vol. 41 (2023)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  2. Vol. 40 (2022)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  3. Vol. 39 (2021)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  4. Vol. 38 (2020)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  5. Vol. 37 (2019)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  6. Vol. 36 (2018)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  7. Vol. 35 (2017)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  8. Vol. 34 (2016)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  9. Vol. 33 (2015)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  10. Vol. 32.2 (2014)

    1. No.2

  11. Vol. 32 (2014)

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    2. No.3
    3. No.2
    4. No.1

  12. Vol. 31 (2013)

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    2. No.3
    3. No.2
    4. No.1

  13. Vol. 30 (2012)

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    2. No.3
    3. No.2
    4. No.1

  14. Vol. 29 (2011)

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    2. No.3
    3. No.2
    4. No.1

  15. Vol. 28 (2010)

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    4. No.1

  16. Vol. 27 (2009)

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    2. No.3
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    4. No.1

  17. Vol. 26 (2008)

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  18. Vol. 25 (2007)

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    4. No.1

  19. Vol. 24 (2006)

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  20. Vol. 23 (2005)

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    3. No.2
    4. No.1

  21. Vol. 22 (2004)

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    3. No.2
    4. No.1

  22. Vol. 21 (2003)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  23. Vol. 20 (2002)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  24. Vol. 19 (2001)

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    2. No.3
    3. No.2
    4. No.1

  25. Vol. 18 (2000)

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    4. No.1

  26. Vol. 17 (1999)

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  27. Vol. 16 (1998)

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  28. Vol. 15 (1997)

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    3. No.2
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  29. Vol. 14 (1996)

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  30. Vol. 13 (1995)

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    4. No.1

  31. Vol. 12 (1994)

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  32. Vol. 11 (1993)

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  33. Vol. 10 (1992)

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  34. Vol. 9 (1991)

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    4. No.1

  35. Vol. 8 (1990)

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    4. No.1

  36. Vol. 7 (1989)

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    4. No.1

  37. Vol. 6 (1988)

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  38. Vol. 5 (1987)

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    4. No.1

  39. Vol. 4 (1986)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  40. Vol. 3 (1985)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  41. Vol. 2 (1984)

    1. No.4
    2. No.3
    3. No.2
    4. No.1

  42. Vol. 1 (1983)

    1. No.3
    2. No.2
    3. No.1

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QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 41 (2023), No. 4

Surface Modification with Cu on Zr-Based Metallic Glass Using Laser Cladding and Improvement of Solder Wettability

Takeshi TERAJIMA, Kazuki SHINSHI

pp. 257-262

DOI:

10.2207/qjjws.41.257

Abstract

Zr55Al10Ni5Cu30 metallic glass (bulk amorphous alloy) have unique properties such as highly resistant to corrosion, high strength and elastic deformation over whole deformation range, so that it is expected to be the next-generation machine materials. To develop further industrial applications, joining technology for the metallic glass is necessary. In this study, surface modification with Cu on Zr55Al10Ni5Cu30 metallic glass using laser cladding and the consequent solderability improvement were studied. As a result, the interface between Cu thin film and Zr55Al10Ni5Cu30 metallic glass were continuously welded by the laser cladding. XRD showed that there are no crystalline and reaction layer in the weld interface. Furthermore, it was found, by XPS, that the Cu modified layer on the Zr55Al10Ni5Cu30 metallic glass surface inhibited the formation of a strong oxide film. Consequently, the Cu modified layer played an important role in improving the solderability to the Zr55Al10Ni5Cu30 metallic glass.

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Surface Modification with Cu on Zr-Based Metallic Glass Using Laser Cladding and Improvement of Solder Wettability

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Tensile Strength of Girth Weld Joint of Linepipe with Softened HAZ

Shoma ONUKI, Masaki MITSUYA, Mitsuru OHATA

pp. 263-272

DOI:

10.2207/qjjws.41.263

Abstract

In seismic-active area, the buried pipeline is subjected to the axial tensile load exceeding the yield stress of pipe material due to the lateral flow induced by soil liquefaction. Designing a girth weld joint that does not fracture at girth weld but base metal which has high elongation capacity is feasible to ensure adequate ground displacement absorbing capacity of the girth weld joint. However, as for fine grain steel, the heat-affected zone (HAZ) is softened by welding heat input, and then, the zone of softened HAZ can be the origin of fracture under tensile load. The apparent strength of softened HAZ is affected by the plastic constraint from the surrounding weld metal and base metal during tensile loading, and the fracture location depends on the apparent strength of HAZ. This study investigates the tensile strength and fracture location of girth weld joints with softened HAZ in the static tensile test. The effect of geometric and mechanical heterogeneity of HAZ, strength overmatching of weld metal, and the width-thickness ratio of tensile test specimen on tensile strength are elucidated using parametric finite element analysis. Subsequently, an equation is proposed to predict the tensile strength and fracture location of the welded joint. Using the proposed equation, the condition of geometric and mechanical heterogeneity of the weld to confirm the girth weld joints that fracture at base metal under tensile load is clarified. The proposed equation can be used to design a girth weld joint with liquefaction earthquake resistance.

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Tensile Strength of Girth Weld Joint of Linepipe with Softened HAZ

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Optimization of welding conditions for friction stir spot welding of A6063S-T5 with composite coated films using a triangular prism-shaped tool

Terumichi MURAKOSHI, Toshiya SHIBAYANAGI

pp. 273-288

DOI:

10.2207/qjjws.41.273

Abstract

Friction Stir Welding (FSW), which was developed at TWI in 1991, is a solid-phase welding process capable of joining linear and point welds, and is being put to practical use in the automotive, aerospace, and other industries for the purpose of weight reduction and multi-materials. In this paper, the effects of each factor on joint strength in friction stir spot welding are clarified using statistical methods, and optimized joint conditions are proposed. Specifically, the optimal joining structure is experimentally clarified for aluminum materials with composite coatings by utilizing the design of experiment method in terms of the degree of influence of tool geometry and tool motion. Only the shape of the tool's probe is triangular prism because it is known to be effective in bonding composite films to the material.

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Optimization of welding conditions for friction stir spot welding of A6063S-T5 with composite coated films using a triangular prism-shaped tool

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Trial Manufacture and Performance Evaluation of Fatigue Crack Growth Restraining Sheets Using a High Water Content Gel

Ichihiko TAKAHASHI

pp. 289-301

DOI:

10.2207/qjjws.41.289

Abstract

A simple technique of restraining fatigue crack growth utilizing wedge effects of corrosion products was newly proposed and experimentally tested. Crack growth restraining sheets with a high water content gel were manufactured by way of trial and applied to notched plate specimens of steel, and the efficacy of the sheets to restrain crack growth was evaluated by fatigue tests. In the fatigue tests, the crack growth restraining sheet was renewed at proper timing to maximize its performance. In order to find a local humid (or wet) corrosive environment, which is most suitable for the crack growth restraint by wedge effects of corrosion products on the crack surfaces, water components absorbed in the gel and effects of a cathode layer as promoting factors of the corrosive reaction were comparatively examined. As a result, it was found that all the proposed crack growth restraining sheets were effective and extend the failure life in the range of 2.1 ~ 9.6 times as compared with the bare base metal specimen. Especially, the efficacy of the gel sheets with 3% salt water and synthetic sea water was remarkable (4.1~9.6 times extension in failure life), and the cathode layer (copper-leaf tape) produced certain additional positive effects in those gel sheets. From fracture mechanical analyses with FE analyses, it was found that the crack restraining effect of the gel sheet greatly varies depending on the water gel content and the existence of cathode layer. In situ observations around the growing cracks and macro- and microscopic observations of the fracture surfaces were also performed for a comparative study between the different types of crack growth restraining sheets.

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Trial Manufacture and Performance Evaluation of Fatigue Crack Growth Restraining Sheets Using a High Water Content Gel

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