Special features of welding by a low-ampere arc with tungsten electrodes

When the arc is powered by a single-phase rectifier with a condenser voltage multiplier using tungsten electrodes with a diameter of 1-2,5 mm, the arc ignites and burns in argon and nitrogen with a current of 4-10 A. Stable arc burning at a reverse polarity provides full penetration of aluminum sheets with a thickness of 0,18-0,5 mm without outflow of a molten pool. In welding of end connections made of low-carbon steel, stainless steel, copper, brass, aluminum with a thickness of 0,06-0,2 mm, with a gap larger than sheet thickness, in argon and nitrogen of high grade, the weld is formed by cylindrical and rectangular electrode at the current of 2,5-9 A. At these low currents Intensive wandering of the active spots are detected.