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

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 39 (2021), No. 3

  • Stud Shape and Joint Strength for Low Carbon Steel Joints fabricated by Friction Stud Welding with Low Load Force Requirement

    pp. 141-150

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    DOI:10.2207/qjjws.39.141

    This paper describes the stud shape and joint strength of low carbon steel joints fabricated by friction stud welding with low load force requirement. To reduce the load force during the welding process, the stud side with the circular hole at the weld faying surface part was used. The outer diameter of a cylindrically shaped stud side had 12.0mm and that was welded to the circular solid bar with a diameter of 24.0mm as the work side. The joint was made with a friction speed of 27.5s-1, a friction pressure of 60MPa, and a forge pressure of 60MPa, which was determined as the low force condition for obtaining good joint in the previous study. When joints were made by a cylindrically shaped stud with a hole diameter of 6.0mm and its depth of 0.5mm, all joints at a friction time of 0.6s, i.e. the friction torque reached to the initial peak, had the same tensile strength as that of the base metal with the base metal fracture. All joints with flash from the initial weld interface had the fracture on the base metal, the bend ductility of over 15 degrees with no cracking at the initial weld interface through an impact shock bending test, and a high fatigue strength of the base metal. That is, the sound joint could be successfully achieved, and that could be obtained with the same friction stud welding condition of the circularly shaped solid stud. As a conclusion, the joining technique for the friction stud welding method with low load force requirement was proposed in accordance with using a cylindrically shaped stud that has the circular hole with the shallow depth at the weld faying surface part.
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  • Observation of Stability and Cleaning Action in AC-GTA under like Mars atmosphere

    pp. 151-157

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    DOI:10.2207/qjjws.39.151

    In 2010, Barack Obama, the former president of the United States, announced sending humans to the Red Planet in the 2030s. Outposts and habitats will be set up in the future by welding technique. In this study, effectiveness of previous AC-GTA welding was investigated in a like Mars atmosphere consisting only CO2 gas with pressure range from 600 to 1000Pa. In order to observe the AC-GTA phenomena, the arc appearances were filmed by a high-speed video camera. Furthermore, the arc voltage and the welding current waveforms were recorded to evaluate the AC-GTA stability. It was found that the cathode spots distribution area spreads and the AC-GTA stability decreases in the less pressure. In conclusion, the AC-GTA welding in the Mars atmosphere can be applicable by considering the ambient pressure and the EP time ratio.
  • Effect of aging treatment on fatigue behavior of Nb-added ferritic stainless steel type 429 welds in 3% NaCl solution

    pp. 158-162

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    DOI:10.2207/qjjws.39.158

    The effect of aging treatment on fatigue behavior of Nb-added ferritic stainless steel type 429 welds in 3% NaCl solution was investigated. Two filler metals with different chemical compositions, Filler I and II, had been used for the MIG butt welding of type 429. After aging treatment at 700℃ for 100 hours was applied to the smooth specimens of the welds, the fully reversed axial fatigue tests were performed in 3% NaCl solution. In the case of the welds with Filler I, there was almost no change in corrosion fatigue strength even after aging treatment. On the other hand, in the case of the welds with Filler II, the corrosion fatigue strength decreased after aging treatment. It was concluded that the combination of aging treatment and heat history of welding using Filler II caused the sensitization of the base metal of the welds and increased the sensitivity to the corrosive environment.
  • Simulation of Nucleation and Growth of Austenite in Duplex Stainless Steels

    pp. 163-170

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    DOI:10.2207/qjjws.39.163

    The microstructure of duplex stainless steels is formed by dendrite growth in the primary ferrite-phase and by subsequent solid-state transformation to the secondary austenite-phase. In this study, formation of austenite by solid-state transformation in duplex stainless steels was evaluated. The nucleation and initial growth of austenite was simulated by the software TC-PRISMA. The formation temperatures of austenite in previous works were corresponding to the calculation obtained by adjusting the interfacial energy. Moreover, the microstructure formation process both in grain boundary and intragranular was simulated using a multiphase field method (MICRESS software). The growth of austenite was assumed to be under paraequilibrium considering the diffusion control of nitrogen and its morphology was assumed to be an acicular growth. The microstructure morphologies were relatively similar to those obtained by the experiments. The simulation method in this study can analyze complex microstructural morphology as well as predict the composition distributions. This method is considered to be highly effective in designing duplex stainless steels and in evaluating the microstructure morphology in welding process.

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