Safety Discussion and Precaution Measures about Laser Beam Welding of Pyrotechnic Actuator

Structure of pyrotechnic actuator used in AP1000 nuclear power plant squib valve was introduced, and laser beam welding danger of pyrotechnic actuator was analyzed. Sulfur-Free Black Powder charged in pyrotechnic actuator was test by Differential Scanning Calorimetry (DSC) method, and temperature at charging position of pyrotechnic actuator was measured during laser beam welding process, results of test and measure show that temperature at charging position is less than autoignition point of powder. To prevent accidents caused by spark splash, laser beam welding workshop was rebuilt, welding fixtures were designed, and safety precaution measures were added in welding technics, these measures can improve safety of laser beam welding process effectively.