Fusion welding process high-dynamic wire feeding control method based on piezoelectric actuator

Abstract

The invention discloses a high-dynamic wire feeding control method in a fusion welding process based on a piezoelectric actuator, which is characterized in that a'emergency brake 'principle is used for reference, molten drops are assisted to be separated from welding wires in a manner of applying external force to the molten drops, and novel equipment different from'feeding-withdrawing' reciprocating wire feeding control is provided to promote molten drop transition; meanwhile, the welding wire excites the molten pool, and the effect of stirring the molten pool is achieved. The device comprises a welding workpiece, an electric arc welding gun, a piezoelectric actuator controller, a bottom radial actuator, a top radial actuator, an axial piezoelectric actuator, a welding wire and a welding power source. According to the device, through independent programming of the piezoelectric actuator, one-pulse-one-drop shot drop transition and smooth and non-splashing short-circuit transition are achieved, molten drop transition, base metal melting, welding current decoupling and molten pool stirring in the welding process are achieved, and the effects of refining crystal grains and improving the welding strength are achieved. The method is applied to high-efficiency welding of gas metal arc welding, precise welding of thin plates and rapid forming and manufacturing processes.

Description

Technical field [0001] The present invention relates to a high dynamic wire feed state control method and mechanism based on a combined piezo actuator, is a melt welding or cladding application field. Background [0002] Melt welding is the main welding technology of all kinds of metal welding, and the specific common methods include melting pole gas shielded welding (GMAW), non-melting pole gas shielded welding (GTAW), laser welding, electron beam welding and other methods. In addition to the GMAW welding process that necessarily involves wire feeding and melting behavior, other methods also use a large number of wire filling welding, involving the control of wire feeding and melting behavior. In particular, for GMAW processes, such as attached Figure 1 As shown, during the welding process, a high-temperature arc is established between the welding wire and the workpiece, and the arc melts the welding wire and the base material at the same time, and the arc length can be maintain...

AI Technical Summary

Problems solved by technology

Therefore, the traditional melting electrode arc cannot obtain stable and controllable droplet transfer under low current, and the processes such as precision welding of a large number of thin plates and arc additive manufacturing need to use a small current to control the heat input of the arc to the base metal

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