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• 2019/10/14　 Welding Engineering Information
  Arc Welding　The 172nd talk ： Ryuhei Takagi
• 2019/10/07　 Welding Engineering Information
  Arc Welding　The 171st talk ： Ryuhei Takagi
• 2019/09/16　 Welding Engineering Information
  Arc Welding　The 170th talk ： Ryuhei Takagi
• 2019/09/09　 Welding Engineering Information
  Arc Welding　The 169th talk ： Ryuhei Takagi
• 2019/09/02　 Welding Engineering Information
  Arc Welding　The 168th talk ： Ryuhei Takagi

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