The invention discloses a
welding method of compounding ultrasonic and nonconsumable
electrode voltaic arc. Under the
welding condition of protection of nonconsumable
electrode gas, the ultrasonic is conducted into
welding arc through the conductive
electrode and the voltaic arc obviously contracts after
ultrasound is carried on. The invention not only has the advantages of stable
welding process and high welding and forming quality which normal TIG welding has, but also can improve
weld penetration of single-pass welding and therefore the method can realize high quality welding under normal welding condition. The invention converts the
high frequency electrical signals of
ultrasound supply into
mechanical vibration through an energy conversion device and the
mechanical vibration is amplified by an amplitude
transformer, and then is transmitted to an electrode studded in the amplitude
transformer so as to generate supersonic vibration of corresponding frequency on the electrode. The input power of the
ultrasound can be adjusted at will between 1W to 1000W and then welding is carried out by the method of normal
gas metal arc welding. When voltaic arc is applied to
processing pieces, the energy is concentrated, thereby effectively improving utilization ratio of voltaic arc during welding.