Laser-GMA electric arc composite heat source wire filling self-adaptive welding method

Abstract

The invention discloses a laser-GMA electric arc composite heat source wire filling self-adaptive welding method. At present, according to a method for achieving welding self-adaption by directly adjusting welding current, unstable electric arc is caused by unstable current, and the stability and the welding quality of the welding process are affected. The device comprises a control system (13), wherein the control system is connected with a wire feeder (12), a laser (14) and a laser sensor (15), the wire feeder feeds an additional filler welding wire (3) to the position of a welding groove (7), the left side of the additional filler welding wire is provided with a GMA electric arc (2), the right side of the additional filler welding wire is provided with a laser beam (4), and the laser sensor is used for detecting stripes (5) to measure the change of a welding groove in real time. On the premise that the GMA electric arc power is not increased, welding wire melting is achieved by additionally filling welding wires and utilizing surplus heat in the welding process, and closed-loop feedback control is formed by the filling amount of the additional filler welding wire, the groove change and the point welding point coordinate position. The method is used as the laser-GMA electric arc composite heat source wire filling self-adaptive welding method.

Description

Technical field[0001]The present invention relates to the field of laser processing techniques, and more particularly to a laser-GMA arc composite heat source filling adaptive welding method.Background technique[0002]Laser-GMA (GMA is a referusion of the melted gas protection welding arc, including the MIG and MAG) arc composite heat source welding technology has a high-speed deep-welded welding technology advantage, usually using small slope design in medium thin plate welding, at this time, assembly gap The amount of change in the fill area of ​​the groove is large, and under high-speed welding conditions, since the size of the laser-GMA arc composite heat source weld is relatively small, the position of the gap is relatively prone to the weld is not filled, in addition, The positioning solder joint is also large to the weld surface formation and welding roots, and it is susceptible to the size of the positioning solder joint when fixed welding parameter welding. On the one hand, ...

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Problems solved by technology

[0002] Laser-GMA (GMA is the abbreviation of gas metal shielded welding arc, including MIG and MAG) arc composite heat source welding technology has the technical advantages of high-speed deep penetration welding. Small groove design is usually used in medium and thin plate welding. At this time, the assembly gap It has a great influence on the variation of the groove filling area, and under high-speed welding conditions, due to the relatively small size of the laser-GMA arc composite heat source weld, the position with a large gap is prone to the phenomenon that the weld is not filled. In addition, Positioning solder joints also have a great influence on the shape of the weld surface and the penetration of the welding root. When welding with fixed welding parameters, it is easily affected by the size of the positioning solder joints. Appearance; on the other hand, due to the presence of tack welds, it is easy to cause the root weld to fail to penetrate. When solving the problem of weld formation caused by groove changes and tack welds, existing related technologies mainly use laser sensors to adjust the groove size. Changes and welding current establish closed-loop feedback control, adjust the welding current according to the groove change in time to change the amount of deposited metal, and realize self-adaptive adjustment of the welding process. There is a fatal flaw in the method of realizing welding self-adaptation by adjusting the welding current indirectly, that is, the large and small changes of the current will easily lead to the instability of the arc, which will affect the stability of the welding process and the welding quality. The welding process adaptive method also has the outstanding problem of arc instability in traditional arc welding

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