Welding process have a variety of hazards: ultraviolet, infrared, light, welding fumes and organic gas etc.. Usually welder to use hand-held immutable light welding mask at the instant of arc will cover the eyes, in the welding process, often make the eyes in the moment by the harmful rays of radiation. Auto darkening welding mask to solve this problem, you can maximize provide eye protection for welding. Automatic variable light welding mask is using the liquid crystal piece, in under the control of the electronic controller of induction welding arc signal, LCD panel in a very short period of time, by the bright state into the dark state. In order to protect the eyes from harm, at the same time, do not need to use mechanical action to move the lens. The automatic welding face mask is mainly composed of three parts, which are the face mask, the window and the head. The shield shell is the main body of light pollution and the welding solute splash during the welding. It is responsible for the installation and positioning of windows. The window mechanism is the visible and invisible substance that is affected by the UV radiation and the damage to the eye during soldering. The head wear mechanism is mainly the position of the fixed mask in the human body, so that the user is more convenient and efficient to complete the work.