QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
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PRINT ISSN: 0288-4771

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 38 (2020), No. 1

  • Hot Cracking Susceptibility of Commercial Filler Metals for Alloy 617 by Varestraint Test

    pp. 1-10

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    DOI:10.2207/qjjws.38.1

    Solidification cracking and liquation cracking susceptibility of four kinds of alloy 617 commercial filler metals were evaluated by Varestraint test, in order to clarify a fundamental effect of each solute element in the alloy. Fracture surface of cracking in alloy 617 multipass welds by GTA welding exhibited a possibility of occurrence of both solidification cracking and liquation cracking. Brittle temperature ranges (BTR) of the liquation cracking at each alloy were almost same, however the BTRs of solidification cracking indicated significant difference. Complex carbide composed carbon, titanium and niobium was formed in the weld metal in the case of the smallest BTR for the solidification cracking, in other words alloy 617 including a lot of titanium and niobium indicated a good susceptibility for the solidification cracking.
    Numerical simulation of solidification segregation of alloy 617 was carried out to reveal the solidification behavior at terminal stage of the alloy. The solidification segregation analysis suggested that solidification cracking susceptibility was attributed the carbide formation depending on the solidification segregation of carbon, titanium and niobium. In the alloy containing titanium and niobium, the carbide formation occurred at the terminal stage of the solidification. Therefore, solidification completed temperature increased because the amount of carbon in residual liquid decreased after the carbide formation.
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  • In-situ measurement of weld quality during MAG welding using laser ultrasonic

    pp. 11-18

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    DOI:10.2207/qjjws.38.11

    Laser ultrasonic technique (LUT) is applicable for measurement under high temperature condition because of the non-contact and remoteness. In this study, LUT was applied to detection the welding defect such as solidification crack and/or lack of penetration at single bevel groove during Gas Metal Arc (GMA) welding process. Nanosecond pulse laser (1064nm, 60mJ/pulse 100Hz) was used to generate ultrasonic, and was scanned using a galvanometer mirror. Nd:YAG laser interferometer (532nm, 1W) was used for detection the surface micro vibration caused by arrival of ultrasonic wave. After acquiring the B-scope, which is composed of multi transmit- and receive-points, the synthetic aperture focusing technique (SAFT) is applied. SAFT image obtained by in-process measurement was evaluated to confirm the presence or absence of welding defect indication. As a result, it was possible to indicate the solidification crack and the lack of penetration in the joint even during the welding process. Furthermore, it was able to indicate the penetration depth change (2mm difference) due to the welding condition change during process. These results suggest that in-process measurement using LUT is very effective technique for detecting weld defects.
    x

    Readers Who Read This Article Also Read

    1. Study on Characteristics of Cold Tandem Mills Tetsu-to-Hagané Vol.67(1981), No.15
    2. Grain Growth in Single- and Dual-Phase Steels Tetsu-to-Hagané Vol.70(1984), No.15
    3. Hot Cracking Susceptibility of Commercial Filler Metals for Alloy 617 by Varestraint Test QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol.38(2020), No.1
  • Fatigue crack propagation under the condition where the superimposed stress history with different frequency components given intermittently

    pp. 19-24

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    DOI:10.2207/qjjws.38.19

    In this study, fatigue crack propagation under the condition where the superimposed stress history with different frequency components was given intermittently was investigated by numerical simulation and fatigue crack propagation test. The numerical simulation of fatigue crack propagation used in this study can consider the opening and closing behavior of fatigue crack and implement stress history extraction algorithm that contributes to fatigue crack propagation under superimposed stress history with different frequency components. An advanced fracture mechanics approach based on the RPG (Re-tensile Plastic zone Generating) stress criterion to identify the effective stress intensity factor range was applied to estimate the fatigue crack propagation history. Fatigue crack propagation test under superimposed stress history containing different frequency component appearing intermittently were also conducted.Validity of our applied numerical simulation method was investigated by comparing numerical simulation results with experimental ones. As a result, the validity of our proposed numerical simulation procedure to estimate the fatigue crack propagation history under such a complicated applied stress history was confirmed.

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