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• 2019/02/18　 Welding Engineering Information
  Arc Welding　The 149th talk ： Ryuhei Takagi
• 2019/02/11　 Welding Engineering Information
  Arc Welding　The 148th talk ： Ryuhei Takagi
• 2019/02/04　 Welding Engineering Information
  Arc Welding　The 147th talk ： Ryuhei Takagi
• 2019/01/21　 Welding Engineering Information
  Arc Welding　The 146th talk ： Ryuhei Takagi
• 2019/01/14　 Welding Engineering Information
  Arc Welding　The 145th talk ： Ryuhei Takagi

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