Current control method during necking detection of fusion electrode electric arc welding

• Main Authors: AKIHIRO IDE, ERA TETSUO
• Format: Patent
• Language: Chinese; English
• Published: 08.05.2013
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

The invention provides a current control method during necking detection of fusion electrode electric arc welding. Detection is performed on a precursory phenomenon which generates arcs again from a short circuit state, that is molten drop necking. If the necking is detected, then the welding current electrified in short circuit loads is enabled to be reduced, and then from a moment that the arc is generated again to a moment of delay period (Tdr), the welding current is increased and is electrified in the arc loads; and when the welding speed (Ws) is smaller than a reference speed (Wt), the delay period (Tdr) is set to be a fixed vale (Tdi) no matter what the value of the welding speed (Ws) is, and when the welding speed (Ws) is larger than the reference speed (Wt), the delay period (Tdr) changes on the basis of the welding speed (Ws). As a result, since the delay period (Tdr) is optimized on the basis of the welding speed (Ws), good welding quality can be obtained even if the welding speed (Ws) changes. And