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• 2018/12/10　 Welding Engineering Information
  Arc Welding　The 141th talk ： Ryuhei Takagi
• 2018/12/03　 Welding Engineering Information
  Arc Welding　The 140th talk ： Ryuhei Takagi
• 2018/11/19　 Welding Engineering Information
  Arc Welding　The 139th talk ： Ryuhei Takagi
• 2018/11/12　 Welding Engineering Information
  Arc Welding　The 138th talk ： Ryuhei Takagi
• 2018/11/05　 Welding Engineering Information
  Arc Welding　The 137th talk ： Ryuhei Takagi

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