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Device and method for cold metal transfer welding online laser postheat treatment

A cold metal transition and post-heat treatment technology, applied in welding equipment, metal processing equipment, laser welding equipment, etc., can solve the problems of brittle fracture of welded joints, shallow penetration, mutual research in other material fields, etc. The effect of repeating tests, increasing penetration, and reducing weld defects

Active Publication Date: 2020-07-14
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The depth of penetration during cold metal transition welding is relatively shallow, and the cooling rate after welding is also relatively fast. This welding method is suitable for welding thin plates, and the welded joint is prone to brittle fracture
When the workpiece is thick, the strength is insufficient. Currently, CMT welding is mainly used for the connection of thin high-strength steel plates, and the connection of light metals such as aluminum and magnesium. Researchers have not conducted mutual research on other material fields.

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  • Device and method for cold metal transfer welding online laser postheat treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The cold metal transition welding online laser post-heat treatment device is used for 1.2mm thick steel plate welding, including welding torch 1, laser system and welding database 3,

[0027] The laser system includes laser 2, laser power supply and laser water cooler. The laser power supply is connected to the laser 2 through wires. The laser water cooler is used to cool down the laser 2 and laser power supply. The laser 2 is set behind the moving direction of the welding torch 1, 650mm away from the laser . The laser 2 is perpendicular to the surface of the workpiece, and the welding database 3 is connected to the welding torch 1 and the laser 2 respectively. The welding torch 1 adopts a CMT welding torch, and the inclination angle of the welding torch is 70° (left welding method).

[0028] Call the welding expert library, select the material as steel, and the thickness of the plate is 1.2.

[0029] Select the welding parameters recommended by the expert database: we...

Embodiment 2

[0032] The cold metal transition welding online laser post-heat treatment device is used for welding 1mm thick steel plate and 1.2mm thick aluminum plate. On the basis of the first embodiment, the laser 2 is arranged behind the moving direction of the welding torch 1, and the laser is moved back by 10mm, and the welding torch is 750mm away from the laser.

[0033] Call the welding expert database, select the material as steel, plate thickness 1; material 2 is aluminum, plate thickness 1.

[0034] Select the welding parameters recommended by the expert database: welding speed 780mm / min, wire feeding speed 3900mm / min, welding current 68A, welding voltage 10.9V, laser power 800W, defocus 16mm.

[0035] The obtained weld has uniform shape, large penetration depth and narrow fusion width.

Embodiment 3

[0037] The method of post-laser heat treatment for cold metal transition welding is carried out according to the following steps:

[0038] Step 1, connect the welding torch, laser system and welding database, the welding torch adopts CMT welding torch,

[0039] Step 2, turn on the welding torch power supply and the laser power supply of the laser system, and perform welding operations on the weld seam,

[0040] Step 3, after the molten pool formed by the weld is solidified, the laser located behind the welding torch scans the surface of the weld, so that the metal temperature on the surface of the weld rises above the phase transition temperature, and the weld is quenched to improve the quality of the weld joint , the angle between the welding torch and the horizontal direction is 60-80°, preferably 65-75°, the angle between the laser and the welding torch is 10-30°, preferably 10-20°, the projection of the welding torch on the molten pool and the laser on the melting pool Th...

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Abstract

The invention provides a device and method for cold metal transfer welding online laser postheat treatment. A laser power supply is connected with a laser device through a wire, a laser water cooler is used for cooling the laser device and the laser power supply, and the included angle between a welding gun and the horizontal direction is 60-80 degrees. The laser device is arranged on the rear portion of the moving direction of the welding gun, and the included angle between the laser device and the welding gun is 10-30 degrees. The distance between the projection of the weld gun on a weld pool and the projection of the laser device on the weld pool is 600-800 mm. A welding database is connected to the welding gun and the laser device. The weld penetration depth is increased, so that the device for cold metal transfer welding online laser postheat treatment is more suitable for welding thick materials. The structure of a weld joint is improved, and defects of the weld joint are reduced. Welding and a heat treatment device are integrated, and the production efficiency is improved. An expert database system provides welding parameters, and repeated tests for parameter adjustment areomitted.

Description

technical field [0001] The invention relates to the technical field of welding devices, and more specifically relates to a device and method for cold metal transition welding on-line laser post-heat treatment. Background technique [0002] Many materials cannot withstand the constant heat input during welding. The traditional short-circuit transition method has large spatter, poor weld formability and easy deformation, penetration, and weld leakage of welded thin plates. In order to avoid droplet penetration, to achieve a splash-free droplet transfer and a good metallurgical connection, it is necessary to reduce the heat input. Cold metal transfer welding technology (Cold Metal Transfer, CMT) is an improved MIG welding based on short-circuit transfer. As a relatively new welding technology, when the droplet is transferred, the current will be reduced to zero instantaneously, which can greatly reduce the input heat. At the same time, the droplet will fall off due to the wit...

Claims

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Application Information

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IPC IPC(8): B23K26/00B23K26/082B23K26/21B23K26/70
CPCB23K26/082B23K26/21B23K26/703
Inventor 罗震杜慧敏郭璟张禹
Owner TIANJIN UNIV