소결체의 Nd:YAG 레이저 용접 시 보호가스가 용접강도에 미치는 영향

Effect of Shielding Gases on the Welding Strength in Nd:YAG Laser Welding of Sintered Material

  This study includes the effects of shielding gas types and flow rate on Nd:YAG Laser weldability of sintered material. The types of shielding gas were evaluated for He, Ar and N₂. Bending strength, porosity rate, hardness and D/W ratio testing of laser weld are carried out to evaluated the quality for fusion area. As a results, Ar gas was showed the best welding strength even the porosity rate is the most value, and increased the flow rate was also improvement the bending strength. Therefore we could know that bending strength is not only affect the porosity rate but also melting degree.