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• 2019/08/19　 Welding Engineering Information
  Arc Welding　The 167th talk ： Ryuhei Takagi
• 2019/08/12　 Welding Engineering Information
  Arc Welding　The 166th talk ： Ryuhei Takagi
• 2019/08/05　 Welding Engineering Information
  Arc Welding　The 165th talk ： Ryuhei Takagi
• 2019/07/15　 Welding Engineering Information
  Arc Welding　The 164th talk ： Ryuhei Takagi
• 2019/07/08　 Welding Engineering Information
  Arc Welding　The 163rd talk ： Ryuhei Takagi

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