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QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 41 (2023), No. 2

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

Backnumber

  1. Vol. 41 (2023)

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

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  28. Vol. 15 (1997)

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  30. Vol. 13 (1995)

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  31. Vol. 12 (1994)

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  32. Vol. 11 (1993)

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  35. Vol. 8 (1990)

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  36. Vol. 7 (1989)

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  37. Vol. 6 (1988)

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  39. Vol. 4 (1986)

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  40. Vol. 3 (1985)

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  41. Vol. 2 (1984)

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  42. Vol. 1 (1983)

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    2. No.2
    3. No.1

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23 Sep. (Last 30 Days)

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 41 (2023), No. 2

Short time Resistance Spot Welding of 1.2GPa Ultra-High Strength Steel using High Frequency Power Supply

Yohsuke ABE, Nobuyori YOSHIOKA, Yoshihito KINOSHITA, Satoshi YAMANE

pp. 178-184

DOI:

10.2207/qjjws.41.178

Abstract

The task of 1.2GPa ultra-high strength steel sheet in short time's high current spot welding has been clarified. High current and short time spot welding system and high frequency power supply has been developed. In order to prevent spatter, new double pulse welding method in which primary energization, cooling and secondary energization has been proposed. By using this novel welding method, nugget diameter and tensile shear strength satisfied the target and spatter did not occur. New method of 1.2GPa ultra-high strength steel sheet in short time and high current spot welding has been established.

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Friction stir spot welding of A6063S-T5 with composite coated films

Terumichi MURAKOSHI, Yuki TAKASHIMA, Toshiya SHIBAYANAGI

pp. 185-194

DOI:

10.2207/qjjws.41.185

Abstract

A6063S-T5 is a material that is frequently used in construction materials, and in many cases, the surface of the material is coated with a composite coated films for durability and design purposes．However, if the composite coated films is interfered with as a foreign substance in the joint while the material is still coated, it may easily have an adverse effect on the joint strength． Therefore, it is usually necessary to remove the coated films before joining or to coat the part after joining．In this paper, the effect of composite coated films on the joining process of friction stir spot welding is clarified, and an efficient joining method for materials with composite coated films is proposed．It was shown that the effect of the composite coated films could be removed by using a triangular prism-shaped tool, and that the bonding area and strength could be controlled．

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Vacuum free self fusion solidification bonding of aluminum by 60/40 brass insert metal

Hiroshi KAWAKAMI, Yoshiki YAMANAKA

pp. 195-207

DOI:

10.2207/qjjws.41.195

Abstract

The self fusion solidification bonding process occurs the isothermal fusion and the isothermal solidification by the reaction diffusion between the base metal and the dissimilar insert metal. The bonding process is carried out below the melting points of the base metal. 60/40 brass was used as the insert metal for the self fusion solidification bonding of aluminum in this study. The periodic motion under the load control was applied to the bonding interface at the bonding temperature. The joint by 60/40 brass insert metal was obtained at the bonding temperature of 893 K. The phases by the isothermal fusion and solidification in the bond were evaluated by the chemical composition of the phase and the ternary phase equilibrium diagram.

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Effect of Mill Scale on Laser Cutting Quality of Various Thick Steel Plates

Keigo YAMANE, Hiroshi KAWAKAMI, Hitoshi OZAKI, Shinji NUMATA, Naoki KOBAYASHI, Norihiro KUROSAWA

pp. 208-216

DOI:

10.2207/qjjws.41.208

Abstract

Laser cutting provides more precise and higher quality cuts than other thermal cutting processes, and is adaptable to automation requirements. On the other hand, laser cutting with oxygen assist gas of thick steel plates is a complex process in which various factors affect laser cutting quality compared to the thin plates. When laser cutting of the plate with mill scale is performed, the mill scale on the surface of plate generally plays a role in supporting stable laser cutting, although self-burning may also occur due to peeling of the mill scale. Therefore, this paper focuses on the mill scale and investigates the effects of the adhesion, thickness, and surface roughness of the mill scale on the laser cutting quality. As a result, it was found that the laser cutting quality is higher when the adhesion of the mill scale is high, the thickness of the mill scale is between 20 μm and 40 μm, and the surface roughness is small.

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23 Sep. (Last 30 Days)

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