A swing laser-cmt hybrid welding method

Abstract

The invention discloses a swing laser-CMT hybrid welding method, and relates to the field of material machining engineering. According to the swing laser-CMT hybrid welding method, the stability of alaser keyhole and an electric arc and the stability of globular transfer in the laser-CMT hybrid welding process are improved, and the problems that defects are generated in the welding process, and the depth of fusion is decreased are solved; hybrid welding is conducted by using a swing laser and the CMT electric arc, the laser needs to conduct reciprocating rectilinear movement or circular arc movement and the like front and back in the welding direction, a CMT welding state is detected by adopting current and voltage detection equipment, the CMT welding state is analyzed by using LabVIEW software, a laser head is controlled to enable the laser to be matched with the CMT electric arc to conduct swinging, the laser is controlled to swing forwards accordingly in the welding wire forward feeding-in process, the laser is prevented from being blocked by a welding wire, and thus an air hole defect is prevented from being caused; and when the short-circuit process comes to an end and the welding wire is drawn back, the laser is controlled to swing backwards, the distance between the welding wire and the laser shortened, and a coupling effect is prevented from disappearing due to the toolong distance after arc starting.

Description

technical field [0001] The invention relates to an oscillating laser-CMT composite welding method, which belongs to the field of material processing engineering. Background technique [0002] Laser-arc composite heat source welding has obvious advantages such as good adaptability to weld assembly, small post-weld deformation, good welding consistency and stability, and has higher Controllability and degree of automation. In order to solve the problem of poor welding shape and large post-welding deformation of thin plates, laser-arc hybrid welding technology, especially laser-CMT hybrid welding technology, may be the best choice for thin plate welding, both from the perspective of technology and from the economic point of view. One of the preferred methods. [0003] CMT technology was developed by the Austrian FRONIUS company, which digitally coordinates the wire feeding and droplet transfer process. CMT arc welding has small current, small heat input, small spatter and sm...

AI Technical Summary

Problems solved by technology

[0007] Due to the paraxial recombination method and the limitation of the laser action position, the angle between the welding torch and the base metal is not greater than 50°. Therefore, when the welding wire is drawn back and the arc energy is small, the laser and arc are completely separated, and even lose recombination. Effect, image 3 It is a high-speed camera picture when the distance between the light filaments is 3mm, Figure 4 For the cross section of the weld, it can be seen that the distance between the arc and the laser is relatively large, and composite plasma cannot be formed. figure 1 and Figure 4 , it can be found that the penetration depth of the weld is reduced, the bottom of the weld is sharp, the width of the middle part is reduced, and the composite effect disappears

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