Abstract: [Problem] To provide a method and a device for sanitizing hands quickly and easily in view of the current state of hand hygiene. [Solution] A sanitization method which is characterized by involving both irradiation of ultraviolet light of a wavelength of between 190 to 230 nm and a treatment using an alcoholic sanitizer; a sanitization method which is characterized in that the alcoholic sanitizer comprises water and an alcoholic agent selected from any one of ethanol, propanol, or a mixture thereof, and the amount of alcoholic agent is greater than the amount of water; and a sanitization device which includes a sanitizer supply unit for depositing the alcoholic sanitizer on an object to be sanitized and an ultraviolet irradiation unit that irradiates the object to be sanitized with ultraviolet light of a wavelength of between 190 to 230 nm.

Abstract: A power supply system for consumable electrode arc welding alternately switches between the reverse polarity and the straight polarity. The formation of an arc is detected. A polarity change control signal is generated when the arc duration reaches a predetermined time or when the quantity of charge reaches a predetermined value. The predetermined value of the welding current or voltage is reduced either immediately before or after the change in polarity.

Abstract: A method of controlling the output of a power source in consumable electrode arc welding in which a short circuiting phase and an arcing phase alternately take place between a consumable electrode and a workpiece in a shielding gas atmosphere, the method being characterized by repetition of a cycle of operation consisting of: a first stage of maintaining the output welding current at a first value of a relatively low level upon establishment of a short circuit across a gap between a consumable electrode and a workpiece; a second stage of maintaining the welding current at a second value of a relatively high level succeedingly to the first stage; a third stage of lowering the welding current to a third value of a low level upon detection of necking as a premonition of rupture of short circuiting molten metal between the electrode and workpiece; a fourth stage of, upon generation of an arc across a gap between the electrode and workpiece subsequent to the third stage, maintaining the welding current at a fourth

Abstract: A method of controlling the output of a power source in consumable electrode are welding in which a short circuiting phase and an arcing phase alternately take place between a consumable electrode and a workpiece in a shielding gas atmosphere, the method being characterized by repetition of a cycle of operation consisting of: a first stage of maintaining the output welding current at a first value of a relatively low level upon establishment of a short circuit across a gap between a consumable electrode and a workpiece; a second stage of maintaining the welding current at a second value of a relatively high level succeedingly to the first stage; a third stage of lowering the welding current to a third value of a low level upon detection of necking as a premonition of rupture of short circuiting molten metal between the electrode and workpiece; a fourth stage of, upon generation of an arc across a gap between the electrode and workpiece subsequent to the third stage, maintaining the welding current at a fourth