To conduct a nuclear fuel irradiation test, the inside of the nuclear fuel rod must be assembled along with the test fuel, several different parts, and sensors, and then filled with high-pressure and high-purityhelium gas. Therefore, it is necessary to develop helium gas filling techniques that can achieve exact TIG (Tungsten Inert Gas) spot welding at a pin-hole of the nuclear fuel rod to fill helium gas into the nuclear fuel test rod. However, previous apparatuses do not have repeatability for TIG spot welding as they lack an electrode position control jig to exactly fix a TIG electrode in a high-pressure chamber, and they consume a large amount of helium gas. Therefore, a TIG spot welding apparatus was developed to easily and accurately conduct TIG spot welding and significantly reduce the gas consumption. In addition, the optimum welding conditions of this welding apparatus were established through various weld tests.

Abstract
 1. 서론
 2. 헬륨가스 충진 시스템
  2.1 TIG 용접기
  2.2 TIG 점용접 챔버
  2.3 헬륨가스 충진용 점용접 지그
 3. 점용접 실험
  3.1 용접방법
  3.2 용접 조건
  3.3 시료 분석
 4. 실험결과 및 고찰
  4.1 용접 전류량
  4.2 용접 시간
  4.3 전극 각도 및 헬륨가스 압력
  4.4 Pin-hole 직경
  4.5 Pin-hole과 전극간의 이격거리
 5. 결론
 후기
 References

• 정창용(한국원자력연구원 하나로이용연구본부 중성자응용기술부) | Chang-Young Joung
• 홍진태(한국원자력연구원 하나로이용연구본부 중성자응용기술부) | Jin-tae Hong
• 김가혜(한국원자력연구원 하나로이용연구본부 중성자응용기술부) | Ka-Hye Kim
• 허성호(한국원자력연구원 하나로이용연구본부 중성자응용기술부) | Sung-Ho Heo