The frame of flat pack container house is consist of cold rolled steel channel. These channels is welded together. The welding property of steel is the ability to adapt to welding process and welding method. Argon arc welding is the method Haicheng uses. Some parts is connected by screws. The screw is welded on the steel kit by stud welding. Some welding process is automatic welding. In this way improve the welding precision and welding efficiency.