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Aluminum alloy thick plate multi-layer laser-TIG hybrid welding device and method

A hybrid welding and welding method 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. It is not easy to weld spatter, prolong the solidification time, and stabilize the welding effect

Active Publication Date: 2020-09-18
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Aluminum alloy thick plate multi-layer laser-TIG hybrid welding device and method
  • Aluminum alloy thick plate multi-layer laser-TIG hybrid welding device and method
  • Aluminum alloy thick plate multi-layer laser-TIG hybrid welding device and method

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Embodiment 1

[0031] Such as figure 1 with 2 As shown, a multilayer laser-TIG composite welding device for aluminum alloy thick plates includes a first TIG power supply 9, a second TIG power supply 1 and a hot wire power supply 8, wherein the negative pole and positive pole of the first TIG power supply 9 are respectively connected to the first TIG power supply 9 A TIG torch 5 is connected to the aluminum alloy thick plate 10 to be welded, thereby forming a molten pool arc 12 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; The welding aluminum alloy thick plate 10 is connected, thereby forms heating arc 13 between the second TIG welding torch 2 and the aluminum alloy thick plate 10 to be welded, and between the first TIG welding torch 5 and the second TIG welding torch 2 there is a d...

Embodiment 2

[0041] This embodiment is an improvement made 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. , reciprocating vibration 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 weld porosity of the backing welding .

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

Embodiment 3

[0045] This embodiment is another improvement made on the basis of embodiment 1. Its main structure is the same as that of embodiment 1. The improvement is that before performing the bottom welding, it is necessary to weld the aluminum alloy thick plate 10 Process a Y-shaped or U-shaped groove, and at the same time, carry out surface treatment on the welded workpiece. Surface treatment refers to removing impurities on the surface of the welded workpiece, and then connect the welded workpiece to the groove of the aluminum alloy thick plate 10 to be welded and fix it with a welding fixture .

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Abstract

The invention provides an aluminum alloy thick plate multi-layer laser-TIG hybrid welding device and method. The device comprises two TIG electric sources, two TIG welding guns, a heater supply and alaser device. The two TIG electric sources are matched with the heater supply so three electric arcs different in power, position and effect are formed; the electric arcs are compounded with a laser beam, so the welding wire melting rate is significantly improved, the welding efficiency of filling and capping is improved, and the problem that in the process of melting a welding workpiece, the adaptability of a laser to an inter-groove gap is poor is solved. In the welding process, the rear side of a molten pool is provided with TIG electric arc shielding gas which is for preventing the moltenpool from oxidation, so a welding molten pool is protected from oxidation; and compared with MIG electric arcs, welding is more stable in the process of TIG electric arc welding, and the situation ofsevere welding splash is not easily caused, so the cleaning grinding procedure for a welding bead and a nearby zone to be welded can be removed after filling welding of each layer and the welding efficiency is improved.

Description

technical field [0001] The invention relates to the welding field of aluminum alloy plates, in particular to a multilayer 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 alloy, large linear expansion coefficient, good fluidity in liquid state, and an oxide film on the surface of aluminum alloy, defects such as pores, undercuts, and poor weld formation often appear 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, and coarse grains, which are prone to welding deformation and residual stress, and the mechanical properties of welded joints are poor. [0003] A Chinese patent with a publication date of 2015.04.29 is a multi-layer laser-MIG composite welding method for thick plates, which discloses the ba...

Claims

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Application Information

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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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