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A kind of multi-layer laser-tig composite welding device and method of aluminum alloy thick plate

A hybrid welding, aluminum alloy technology, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of low filling and cover welding efficiency, poor laser gap adaptability, and poor welding stability, etc. Improve the utilization of laser energy, prolong the coagulation time, and reduce the effect of heat input

Active Publication Date: 2022-05-24
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0004] In order to solve the problem of low welding efficiency caused by the need to clean and polish the weld bead and the nearby area to be welded after each layer of filling welding in the existing thick plate multi-layer laser-MIG welding method, and at the same time solve the problem of high weld porosity and bottoming Due to the problems of poor adaptability of the laser to the gap, low efficiency of filling and covering welding, and poor welding stability due to the reserved groove gap during welding, the invention provides a multilayer laser-TIG composite welding device and method for aluminum alloy thick plates , the device uses two TIG welding torches, two TIG power supplies and a hot wire power supply to generate three arcs with different functions, and these three arcs are recombined with the laser, so that the welding wire melts and flows into the molten pool formed by the laser beam middle

Method used

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  • A kind of multi-layer laser-tig composite welding device and method of aluminum alloy thick plate
  • A kind of multi-layer laser-tig composite welding device and method of aluminum alloy thick plate
  • A kind of multi-layer laser-tig composite welding device and method of aluminum alloy thick plate

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Embodiment 1

[0031] like figure 1 and 2 As shown, a multilayer laser-TIG hybrid welding device for aluminum alloy thick plates includes a first TIG power source 9, a second TIG power source 1 and a hot wire power source 8, wherein the negative electrode and the positive electrode of the first TIG power source 9 are respectively connected with the first TIG power source 9. A TIG welding torch 5 is connected to the aluminum alloy thick plate 10 to be welded, so that a molten pool arc 12 is formed between the first TIG welding torch 5 and the aluminum alloy thick plate 10 to be welded; A TIG welding torch 5 is connected to the welding wire 7, thereby forming a fuse arc 11 between the first TIG welding torch 5 and the bottom end of the welding wire 7; Welding aluminum alloy thick plates 10 are connected, thereby forming a heating arc 13 between the second TIG welding torch 2 and the aluminum alloy thick plate 10 to be welded. The surface of the thick alloy plate 10 emits a laser beam 4 .

...

Embodiment 2

[0041] This embodiment is an improvement on the basis of Embodiment 1. Its main structure is the same as that of Embodiment 1. The improvement is that the first TIG welding torch 5 is controlled by an ultrasonic horn 3 during the welding process. , vibrate back and forth along the welding direction.

[0042] In this embodiment, by adding the ultrasonic horn 3, the ultrasonic vibration generated can stir the molten pool, and at the same time prolong the solidification time of the molten pool, which is conducive to the escape of welding bubbles from the molten pool, and reduces the porosity of the weld seam of bottom welding. .

[0043] The ultrasonic vibration frequency of the ultrasonic horn 3 is preferably 5-900kHz, and the vibration amplitude is preferably 1-10um.

Embodiment 3

[0045] This embodiment is another improvement on the basis of Embodiment 1. Its main structure is the same as that of Embodiment 1. The improvement lies in that: before the bottom welding is performed, the aluminum alloy thick plate 10 to be welded needs to be welded. Process a Y-shaped or U-shaped groove, and at the same time, perform surface treatment on the welding workpiece. Surface treatment refers to removing impurities on the surface of the welding workpiece, and then connecting the welding workpiece with the groove of the aluminum alloy thick plate 10 to be welded and fixing it with a welding fixture .

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Abstract

A multi-layer laser-TIG composite welding device and method for aluminum alloy thick plates, including two TIG power supplies, two TIG welding torches, a hot wire power supply and a laser, and two TIG power supplies cooperate with the hot wire power supply to form different power , three arcs in different positions and different functions, and combined with the laser beam, so as to achieve a significant increase in the melting rate of the welding wire, improve the welding efficiency of filling and capping, and solve the problem of poor adaptability to the groove gap when laser melting welding workpieces The problem. When welding, the present invention has a TIG arc shielding gas behind the molten pool to protect the molten pool from oxidation, which can protect the welding pool from oxidation, and compared with the MIG arc, the welding in the TIG arc welding process is more stable and less likely to occur. Therefore, the cleaning and grinding process of the welding bead and the nearby area to be welded after each layer of filling welding can be eliminated, and the welding efficiency can be improved.

Description

technical field [0001] The invention relates to the welding field of aluminum alloy plates, in particular to a multi-layer laser-TIG composite welding device and method for aluminum alloy thick plates. Background technique [0002] Due to the good electrical and thermal conductivity of aluminum alloys, large coefficient of linear expansion, good fluidity in liquid state, and an oxide film on the surface of aluminum alloys, defects such as pores, undercuts, and poor weld formation often occur during welding. The traditional welding method of aluminum alloy thick plate generally adopts multi-layer multi-pass welding. The traditional welding method has large heat input, wide heat-affected zone, coarse grains, easy to produce welding deformation and residual stress, and poor mechanical properties of welded joints. [0003] A Chinese patent published on 2015.04.29 is a method for multi-layer laser-MIG hybrid welding of thick plates, which discloses bottoming welding of workpiece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/348B23K103/10
CPCB23K26/348B23K2103/10
Inventor 彭进许红巧龙伟民王星星
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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