Development of a Chamber for the Pin-Hole Laser Welding

We have been studied about an irradiation test using a capsule for a fuel performance test in the test reactor. An irradiation fuel has a pin and it fill up with helium gas through a pin hole. After fill of helium gas, a pin hole should be sealed by welding. Therefore, the vacuum/pressure chamber is needed for seal welding and also, is needed the welding device. The method of normal seal welding is TIG spot in shot time and high current condition. But we developed the seal welding chamber using a fiber laser. This welding chamber will be used for the fabrication of LVDT(Linear Variable Differential Transformer) and instrumented irradiation fuel. This paper describes about the design of welding chamber, the fabrication of chamber and test of pin-hole welding