The invention belongs to the field of
welding methods, and discloses a dual-center negative pressure
electric arc wire filling
welding method. Two identical hollow tubular cathodes are arranged, and two sets of
welding power sources and control systems are connected with the cathodes. Gas in an
electric arc center area is extracted away through a gas extractor, so that pressure of the area is lowered, a certain
pressure difference exists between the gas in the
electric arc center area and gas outside electric arcs, the two arcs are compressed at the same time under the action of barometric pressure, and a high-energy-density constrained electric arc is formed.
Welding wires are vertically fed from the position between two electrodes, electric arc heat is absorbed for melting to form molten drops, and the molten drops are transited to a melting
pool. According to the welding method, the current
bearing capacity is increased, and the welding speed is increased. By means of the formed high-energy-density electric arc, penetrability on a workpiece is increased, the interference action of the two electric arcs is weakened, part of electric arc heat is extracted away through gas extracting, the heat influence area range is narrowed, and
welding deformation is relieved. The position between the two electrodes is filled with the welding wires, the interference action of the two electric arcs can be balanced, and the welding defects such as
undercut and melting
pool collapsing brought by high-energy beam welding can be overcome.