CN111408834B - Device and method for cold metal transition welding on-line laser post-heat treatment - Google Patents
Device and method for cold metal transition welding on-line laser post-heat treatment Download PDFInfo
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- CN111408834B CN111408834B CN201910013760.9A CN201910013760A CN111408834B CN 111408834 B CN111408834 B CN 111408834B CN 201910013760 A CN201910013760 A CN 201910013760A CN 111408834 B CN111408834 B CN 111408834B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
- B23K26/703—Cooling arrangements
Abstract
The invention provides a device and a method for on-line laser post-heat treatment of cold metal transition welding, wherein a laser power supply is connected with a laser through a lead, a laser water cooling machine is used for cooling the laser and the laser power supply, an included angle between a welding gun and the horizontal direction is 60-80 degrees, the laser is arranged behind the moving direction of the welding gun, the included angle between the laser and the welding gun is 10-30 degrees, the distance between the projection of the welding gun on a molten pool and the projection of the laser on the molten pool is 600 plus 800mm, and a welding database is respectively connected with the welding gun and the laser. The melting depth is increased, and the welding method is more suitable for welding of thicker materials; the structure of the welding seam is improved, and the defects of the welding seam are reduced; the welding and heat treatment device is integrated, so that the production efficiency is improved, welding parameters are provided by an expert database system, and repeated tests for adjusting the parameters are omitted.
Description
Technical Field
The invention relates to the technical field of welding devices, in particular to a device and a method for cold metal transition welding on-line laser post-heat treatment.
Background
Many materials cannot withstand the continual input of heat during the welding process. The traditional short circuit transition mode has large splashing and poor weld formability, and a welded sheet is easy to deform, weld through and weld leakage. In order to avoid droplet penetration, to achieve a splash-free droplet transfer and a good metallurgical bond, the heat input must be reduced. Cold Metal Transfer (CMT) is an improved gas Metal arc welding based on short circuit Transfer. As a newer welding technology, when molten drops are in transition, the current can be instantly reduced to zero, the input heat can be greatly reduced, and meanwhile, the molten drops fall off due to the drawing back of welding wires, so that no splashing is generated when the molten drops are in transition. The CMT welding technology has a unique molten drop transition mode, so that the heat input is obviously reduced, and the problem of sheet welding is well solved.
The fusion depth is shallow during cold metal transition welding, the cooling speed after welding is high, the welding method is suitable for welding thin plates, and a welding joint is easy to generate brittle fracture. The strength and the like of a workpiece are insufficient when the workpiece is thick, the current CMT welding is mainly used for connecting thin high-strength steel plates and connecting light metals such as aluminum and magnesium, and researchers do not research the fields of other materials. Laser heat treatment techniques are also known as laser quenching or laser phase change hardening. The laser heat treatment technology is also called laser quenching or laser phase change hardening, the surface temperature of the scanned metal or alloy is rapidly raised to be above a phase change point by scanning the surface of a workpiece through laser, but the temperature of a matrix is obviously lower than that of a heat treatment area, and when a laser beam leaves the surface of the workpiece, the temperature is rapidly reduced due to the action of heat conduction to achieve the quenching effect.
Disclosure of Invention
The invention overcomes the defects in the prior art, the existing CMT welding is only mainly used for connecting thin high-strength steel plates and connecting light metals such as aluminum magnesium and the like, and provides the device and the method for the cold metal transition welding on-line laser post-heat treatment, which have the characteristics of improving the joint quality, improving the production efficiency and reducing the operation difficulty.
The purpose of the invention is realized by the following technical scheme.
The device for the on-line laser post-heat treatment of cold metal transition welding comprises a welding gun, a laser system and a welding database,
the laser system comprises a laser, a laser power supply and a laser water cooling machine, wherein the laser power supply is connected with the laser through a lead, the laser water cooling machine is used for cooling the laser and the laser power supply, an included angle between a welding gun and the horizontal direction is 60-80 degrees, the laser is arranged behind the moving direction of the welding gun, an included angle between the laser and the welding gun is 10-30 degrees, the distance between the projection of the welding gun on a molten pool and the projection of the laser on the molten pool is 600-800mm, and the welding database is respectively connected with the welding gun and the laser.
The included angle between the welding gun and the horizontal direction is 65-75 degrees.
The included angle between the laser and the welding gun is 10-20 degrees.
The distance between the projection of the welding gun on the molten pool and the projection of the laser on the molten pool is 650-750 mm.
The welding gun adopts a CMT welding gun.
The cold metal transition welding on-line laser post-heat treatment method comprises the following steps:
step 1, connecting a welding gun, a laser system and a welding database,
step 2, starting a welding gun power supply and a laser power supply of a laser system, carrying out welding operation on a welding seam,
and 3, after a molten pool formed by the welding seam is solidified, scanning the surface of the welding seam by a laser positioned behind the welding gun so that the metal temperature on the surface of the welding seam is raised to be higher than the phase transition temperature, quenching the welding seam to improve the quality of a joint of the welding seam, wherein related welding parameters can be directly called in a welding database so as to be directly utilized in the welding gun and a laser system.
The angle of the welding gun to the horizontal is 60-80 degrees, preferably 65-75 degrees.
The angle between the laser and the welding gun is 10-30 degrees, preferably 10-20 degrees.
The distance between the projection of the welding gun on the molten pool and the projection of the laser on the molten pool is 600-800mm, preferably 650-750 mm.
The welding gun adopts a CMT welding gun.
The invention has the beneficial effects that: the melting depth is increased, and the welding method is more suitable for welding of thicker materials; the structure of the welding seam is improved, and the defects of the welding seam are reduced; the welding and heat treatment device is integrated, so that the production efficiency is improved, welding parameters are provided by an expert database system, and repeated tests for adjusting the parameters are omitted.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1 is a welding gun, 2 is a laser, and 3 is a welding database.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example one
The device for cold metal transition welding on-line laser post-heat treatment is used for welding a steel plate with the thickness of 1.2mm, comprises a welding gun 1, a laser system and a welding database 3,
laser system includes laser 2, laser power and laser water-cooling machine, and the laser power passes through the wire and links to each other with laser 2, and the laser water-cooling machine is used for cooling down for laser 2 and laser power, and laser 2 sets up at 1 moving direction's of welder rear, apart from laser 650 mm. The laser 2 is vertical to the surface of a workpiece, the welding database 3 is respectively connected with the welding gun 1 and the laser 2, the welding gun 1 adopts a CMT welding gun, and the inclination angle of the welding gun is 70 degrees (left welding method).
And (5) calling a welding expert library, and selecting steel as a material with the plate thickness of 1.2.
Selecting welding parameters recommended by an expert database: the welding speed is 400mm/min, the wire feeding speed is 400mm/min, the welding current is 139A, the welding voltage is 10.4V, the laser power is 800W, and the defocusing amount is 26 mm.
The obtained welding line is uniform in forming and large in penetration.
Example two
The device for the cold metal transition welding on-line laser post-heat treatment is used for welding a 1mm thick steel plate and a 1.2mm thick aluminum plate. In the first embodiment, the laser 2 is set behind the moving direction of the welding torch 1, the laser is moved backward by 10mm, and the welding torch is 750mm away from the laser.
Taking a welding expert library, and selecting steel as a material with the plate thickness of 1; the material 2 was aluminum and had a thickness of 1.
Selecting welding parameters recommended by an expert database: the welding speed is 780mm/min, the wire feeding speed is 3900mm/min, the welding current is 68A, the welding voltage is 10.9V, the laser power is 800W, and the defocusing amount is 16 mm.
The obtained welding line has uniform forming, large fusion depth and narrow fusion width.
EXAMPLE III
The cold metal transition welding on-line laser post-heat treatment method comprises the following steps:
step 1, connecting a welding gun, a laser system and a welding database, wherein the welding gun adopts a CMT welding gun,
step 2, starting a welding gun power supply and a laser power supply of a laser system, carrying out welding operation on a welding seam,
and 3, after a molten pool formed by the welding seam is solidified, scanning the surface of the welding seam by a laser positioned behind a welding gun to enable the metal temperature on the surface of the welding seam to rise above the phase transition temperature, quenching the welding seam to improve the quality of a welding seam joint, wherein the included angle between the welding gun and the horizontal direction is 60-80 degrees, preferably 65-75 degrees, the included angle between the laser and the welding gun is 10-30 degrees, preferably 10-20 degrees, the distance between the projection of the welding gun on the molten pool and the projection of the laser on the molten pool is 600-800mm, preferably 650-750mm, and related welding parameters can be directly called in a welding database so as to be directly utilized in the welding gun and a laser system.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and is not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (3)
1. Device of cold metal transition welding online laser aftertreatment, its characterized in that: the welding system comprises a welding gun, a laser system and a welding database, wherein the laser system comprises a laser, a laser power supply and a laser water-cooling machine, the laser power supply is connected with the laser through a lead, the laser water-cooling machine is used for cooling the laser and the laser power supply, an included angle between the welding gun and the horizontal direction is 60-80 degrees, the laser is arranged behind the moving direction of the welding gun, an included angle between the laser and the welding gun is 10-20 degrees, the distance between the projection of the welding gun on a molten pool and the projection of the laser on the molten pool is 650-750mm, and the welding database is respectively connected with the welding gun and the laser;
the cold metal transition welding on-line laser post-heat treatment method comprises the following steps:
step 1, connecting a welding gun, a laser system and a welding database,
step 2, starting a welding gun power supply and a laser power supply of a laser system, carrying out welding operation on a welding seam,
and 3, after a molten pool formed by the welding seam is solidified, scanning the surface of the welding seam by a laser positioned behind the welding gun so that the metal temperature on the surface of the welding seam is raised to be higher than the phase transition temperature, quenching the welding seam to improve the quality of a joint of the welding seam, wherein related welding parameters can be directly called in a welding database so as to be directly utilized in the welding gun and a laser system.
2. The cold metal transition welding on-line laser post heat treatment device according to claim 1, characterized in that: the included angle between the welding gun and the horizontal direction is 65-75 degrees.
3. The cold metal transition welding on-line laser post heat treatment device according to claim 1, characterized in that: the welding gun adopts a CMT welding gun.
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| JP3704870B2 (en) * | 1997-02-26 | 2005-10-12 | 株式会社デンソー | Cold forging welding method |
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| CN101811231B (en) * | 2009-02-20 | 2011-08-17 | 机械科学研究院哈尔滨焊接研究所 | Method for welding with laser-cold metal transferred arc composite heat source |
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Inventor after: Guo Qijun Inventor after: Luo Zhen Inventor after: Du Huimin Inventor after: Guo Jing Inventor after: Zhang Yu Inventor before: Luo Zhen Inventor before: Du Huimin Inventor before: Guo Jing Inventor before: Zhang Yu |
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