Pulsation wire filler welding method and system based on frequency modulation and phase control type pulse laser

Abstract

The invention relates to a pulsation wire filler welding method and system based on frequency modulation and phase control type pulse laser. The method comprises the following steps: a pulsation wirefeeding power supply is connected to a pulsation wire feeding motor and a signal collecting unit; a controller controls a welding stick to fill and withdraw by the pulsation wire feeding motor and isconnected to the signal connecting unit, a control unit, a computer and a pulse laser generator successively; the control unit outputs a trigger signal; the computer controls the output power of the pulse laser, wherein the trigger signal is a withdrawn pulse Gbs, a phase shift pulse and a wire filler pulse Gfs successively in a period; when the pulsation wire feeding motor withdraws and fills thewire, the computer receives Gbs and Gfs successively; and the pulse laser generator outputs a transitional pulse, a low power pulse and a high power pulse correspondingly to fully melt the welding stick. Compared with the prior art, the method and system have the advantages of uniform welding, large depth of fusion and the like.

Description

Technical field [0001] The invention relates to the field of electronic measurement and control, in particular to a pulsating wire filler welding method and system based on a frequency-modulated phase-controlled pulse laser. Background technique [0002] In the laser welding process, on the one hand, it is necessary to ensure that the energy generated by the laser is absorbed by the workpiece to the maximum extent to obtain the maximum penetration effect; on the other hand, it is necessary to ensure that the surface of the workpiece after welding is smooth and uniform without collapse. In addition, sometimes it is necessary to improve the structure and performance of the weld area by controlling the heat input and filler of the entire weld. This requires matching the heat input and filler to complete the welding. In order to maximize the recombination effect, it has been found that by matching a pulsed laser output to the pulsed arc, the absorption and scattering effects of the w...

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Problems solved by technology

However, the control object of the above-mentioned patents is the characteristics of the TIG arc, and there is a process of welding wire melting in the laser wire filling welding process. The document "E.Assuncao, S.Williams, Comparison of continuous wave and pulsed wave laser welding effects, Optics and Lasers in Engineering "(2013) found that the penetration depth produced by pulsed laser is larger than that produced by continuous laser. If the welding wire is output continuously, but the laser is pulsed, there may be uneven melting

However, when pulsating wire feeding is used, due to the existence of wire feeding inertia, that is, the welding wire is in the wire filling state when the high-power laser is output, and the welding wire is drawn back when the laser is ready to enter low power. Due to the inertia of the wire, there will be a delay in the withdrawal of the welding wire, which may cause the welding wire to not be completely melted, and the phenomenon of sticking wire will occur, which will affect the welding effect

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