Taking the solenoid valve and the thruster as an example

the vacuum electron beam welding process of the typical structure of the annular joint is described.The main factor affecting weld quality is porosity defect during welding.The main causes of welding porosity are unreasonable use of silicone oil

vacuum in the chamber

unreasonable position of the cutter slot and cavity after root cleaning.After adopting reasonable welding process measures

the blowhole in the joint can be well controlled

which ensures the mechanical properties of the weld and meets the requirements of the design.