소결밀도에 따른 분말 소결금속과 탄소강의 이종금속 레이저 용접성 고찰

The Study of Laser Weldability of two different Metal, Carbon Steel and Sintered Materials, Depends on the Sintered Density

  Sintered specimen which used for a blade of diamond tool was manufactured in order to verify CO₂ laser weldability depend on sintered temperature. Five kind of specimen were prepared and the range of temperature is from 600℃ to 1000℃ at intervals of 100℃. As a result of the sintered density test, the porosity rate appeared in the range of 2.1%~21.4%. After welding, the most segments had exceeds the minimum fracture stress (600㎫, The Standard Safety of Europe) at the welding strength test except on the sintered at 600℃. In case of the sintered at 700℃, even satisfied the safety allowable stress but cannot get the good quality for bead appearance because of humping defect. In the conclusion, we could know that it showed not only relatively soundness bead but also enough welding strength when the sintered blade of diamond tool is included less than 4% of porosity rate.