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Laser and arc hybrid welding method

A hybrid welding and arc welding technology, used in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of decreased mechanical properties of welds, uneven distribution of alloying elements, large unevenness, etc., to improve welding quality, Achieve the effect of uniformity and process parameter optimization

Inactive Publication Date: 2013-09-11
NEW METALLURGY HI TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing laser-arc hybrid welding weld seam alloy elements have large inhomogeneity, resulting in the decline of the mechanical properties of the weld seam
On the basis of the existing laser-arc hybrid welding technology, the present invention proposes an improved laser-arc hybrid welding method to improve the problem of uneven distribution of alloy elements in the laser-arc hybrid welding weld

Method used

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Effect test

Embodiment 1

[0033] For high-strength steel with a thickness of 12mm and 780MPa grade, that is, workpiece 6, CO 2 Laser-pulse MIGA welding composite welding method, using laser 1 and arc welding torch 2, where the laser power of laser 1 is 8kW, laser shielding gas 3 uses pure He, the gas flow rate is 50L / min, and the welding speed is 1.0m / min ;The droplet transfer form of pulse MIGA welding is one pulse transfer one droplet, the pulse frequency is 200Hz, the pulse current peak value is 470A, the voltage is 41V, the pulse current base value is 90A, the voltage is 36V, the pulse width is 2.5ms, the arc The welding shielding gas is He (the rest)-38%Ar-2%O 2, The angle between the arc welding torch and the laser beam is 35°, the distance 5 between the arc welding nozzle and the workpiece is 20mm, and the distance 4 between the laser and the arc center is 5mm. The welding direction is laser in front, and the flow direction of molten pool is as follows: figure 2 The arrow shows inward flow, a...

Embodiment 2

[0035] For high-strength steel with a thickness of 12mm and 780MPa grade, that is, workpiece 6, CO 2 The laser-pulse MIGA welding hybrid welding method adopts laser 1 and arc welding torch 2, wherein the power of laser 1 is 8kW, the laser shielding gas 3 is pure He, the gas flow rate is 45L / min, and the welding speed is 1.0m / min. The welding direction is the laser first, and the droplet transfer form of pulse MIGA welding is one pulse transfer one droplet, the pulse frequency is 200Hz, the pulse current peak value is 480A, the voltage is 41V, the pulse current base value is 100A, the voltage is 36V, and the pulse width is 2.5 ms, the angle between the arc welding torch and the laser beam is 35°, the distance between the arc welding nozzle and the workpiece is 20mm, the distance between the laser and the arc center is 5mm; the arc welding shielding gas is He (the rest)-38%Ar-10%O 2 When the molten pool flows as figure 2 Shown, while the weld alloy elements such as Figure 6 ...

Embodiment 3

[0037] For 11mm thick 490MPa grade low carbon steel, that is, workpiece 6, CO 2 The laser-pulse MIGA welding hybrid welding method uses laser 1 and arc welding torch 2, where the laser power is 7kW, the laser shielding gas 3 is pure He, the gas flow rate is 55L / min, the welding speed is 0.7m / min, and the welding direction is The laser is in front, the form of pulse MIG shielded welding droplet transfer is one pulse transfer one droplet, the pulse frequency is 200Hz, the peak value of pulse current is 480A, the voltage is 41V, the base value of pulse current is 100A, the voltage is 36V, the pulse width is 2.5ms, the arc The angle between the welding torch and the laser beam is 37°, the distance 5 between the arc welding nozzle and the workpiece is 18 mm, and the distance 4 between the laser and the arc center is 5 mm. The arc welding shielding gas is He and the rest-38%Ar-2%O 2 When , the molten pool flow direction is as figure 2 Shown is inward flow, resulting in weld alloy...

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Abstract

The invention provides a laser and arc hybrid welding method. The laser and arc hybrid welding method has the advantages that the uniformity of distribution of alloy elements of a laser and arc hybrid welding joint can be improved by the laser and arc hybrid welding method, a CO<2> laser source is used in the method, pure He is used as protective gas for laser welding, a laser and gas metal arc welding hybrid mode is adopted, inward flow of fluid in a molten pool is promoted by means of adjusting the welding direction, an angle between an arc welding gun and a laser beam, the distance from the center of laser to the center of an arc, the distance from an arc welding nozzle to a workpiece, the welding speed and the content of protective gas O<2> for arc welding, the uniformity of the distribution of the alloy elements of the welding joint is improved, and the alloy elements are uniformly distributed.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for uniform distribution of alloy elements in a laser-arc hybrid welding seam. Background technique [0002] Laser welding has strict requirements on the assembly clearance of workpieces, because defects such as air holes and undercuts are prone to occur during welding. In order to eliminate or reduce the above-mentioned defects of laser welding, on the basis of maintaining the advantages of laser processing, a laser-arc hybrid welding technology is proposed. In the late 1970s, British scholar W M Steen first proposed the concept of laser and TIG composite heat source welding. The main idea is to effectively use arc energy to obtain greater welding penetration at lower laser power. This method combines the advantages of laser and arc, that is, the high energy density of laser and the large heating area of ​​arc, and at the same time, the coupling characteristics of las...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02
Inventor 赵琳张岩田志凌赵子强林双平
Owner NEW METALLURGY HI TECH GRP