Method and apparatus for electric arc welding

The device for melting the metal the deposition from the welding wire of march to two juxtapositions the main boards forces arc welder of between the welding tub, wherein the main forces to form of a welding way and a converging the wall of, wherein the device comprises: A welding wire outlet contact; aA switch power supply, wherein the welding wires according marched forward and define the retaining contact with the welding tubs an electrode is stretched out; And a length circuit of for detecting stretched out; And, and is of the swinging the function of detecting opposite to the adjusting the welding current the control device.