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Laser-cold metal transferred arc coaxial composite additive manufacturing device and method

A technology of cold metal transition and additive manufacturing, which is applied in the direction of manufacturing tools, laser welding equipment, metal processing equipment, etc., and can solve problems such as poor spreadability, unstable welding process, and greater influence of welding direction

Pending Publication Date: 2018-09-07
上海涵涌科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using CMT welding alone, due to the relatively low temperature of the molten pool in CMT arc welding, defects such as unfused or slag inclusion are prone to occur when multi-layer multi-pass welding is used; and pure Ar-protected CMT arc welding stainless steel, When nickel-based alloy or high-strength steel, there are problems such as arc fluttering, insufficient stiffness, unstable welding process, etc., which have a negative impact on welding quality
[0004] In response to the above problems, the Chinese invention patent with the publication number CN101811231B discloses a laser-CMT composite welding process, aiming at the poor spreadability of the CMT arc welding seam and the shortcomings of the CMT arc welding with pure Ar protection, making full use of the CMT arc Based on the advantages of low heat input, small spatter, small weld deformation and high welding metallurgical quality, CMT arc welding and laser welding are combined, and the effect of laser in the composite heat source is used to overcome the shortcomings of the CMT arc welding method. high quality welding
But, according to its description and the accompanying drawings, the center distance L between the spot of the laser beam and the spot of the CMT arc is 0-8mm, or in other words, the CMT arc is located on the peripheral side of the laser beam. This hybrid welding method still exists as follows Disadvantages: 1. The asymmetry between the CMT arc heat source and the laser heat source is greatly affected by the welding direction, and it is difficult to be used for complex curved surfaces or three-dimensional welding; 2. The mutual position between the CMT arc spot and the laser beam focus spot The relationship is not easy to maintain stability in practical application, and has a great influence on the stability of the welding process

Method used

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  • Laser-cold metal transferred arc coaxial composite additive manufacturing device and method
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  • Laser-cold metal transferred arc coaxial composite additive manufacturing device and method

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Embodiment 1

[0053] Embodiment one, as figure 2 As shown, in this embodiment, the beam splitter 3 has two beam splitter surfaces 31 , and two 180° symmetrically distributed parabolic reflective focusing mirrors 4 are installed in the inner cavity 11 of the fixing base 1 . Therefore, after the incident laser beam 81 output by the laser is incident on the beam splitter 3 through the beam entrance 12, the beam splitter 3 divides the incident laser beam 81 into two reflected laser beams 82 which are symmetrically distributed; the two reflected laser beams 82 respectively pass through two After being reflected by the parabolic reflective focusing mirror 4, two focused laser beams 83 are formed; the two focused laser beams 83 are emitted from the beam exit 13 of the holder 1 and focused on the substrate, and act together with the CMT arc on the surface of the substrate, relying on Laser-CMT coaxial composite symmetrical heat source for welding or additive manufacturing.

Embodiment 2

[0054] Embodiment two, such as image 3 As shown, in this embodiment, the beam splitter 3 is a prismatic beam splitter 3 with three beam splitter surfaces 31 , and three parabolic reflective focusing mirrors 4 uniformly distributed in the circumferential direction of 120° are installed in the inner cavity 11 of the fixing base 1 . Therefore, after the incident laser beam 81 output by the laser is incident on the prism beam splitter 3 through the beam entrance 12, the prism beam splitter 3 divides the incident laser beam 81 into three reflected laser beams 82 uniformly distributed in the circumferential direction of 120°; the three reflected laser beams The beams 82 are respectively reflected by three parabolic reflective focusing mirrors 4 to form three focused laser beams 83; the three focused laser beams 83 are emitted from the beam exit 13 of the holder 1 and focused on the substrate, and interact with the CMT arc On the surface of the substrate, welding or additive manufac...

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Abstract

The invention provides a laser-cold metal transferred arc coaxial composite additive manufacturing device. The device comprises a laser device, a CMT welding power supply and a composite welding head,wherein the composite welding head comprises a fixing seat with an inner cavity, a CMT welding gun, a spectroscope installed in the inner cavity and at least two reflecting focusing mirrors; a lightbeam inlet and a light beam outlet are formed in the fixing seat, the spectroscope divides an incident laser beam into at least two beams of reflected laser beams, the reflecting focusing mirrors reflect the reflected laser beams into focused laser beams, the tail ends of the multiple beams of focused laser beams are provided with a focused laser light spot in a focusing mode, and form a hollow area, and the focused laser light spot, a welding gun nozzle of the CMT welding gun and the hollow area are coaxially arranged. According to the device, the CMT arc spot and the focused laser light spotare coaxially combined into a symmetric composite heat source, so that the welding process is not affected by the welding direction, and then the device is conveniently used for complex curved surface welding, three-dimensional welding, additive manufacturing of complex parts and the like.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a laser-cold metal transition arc coaxial composite additive manufacturing device and method. Background technique [0002] Laser-arc hybrid welding combines the advantages of laser and arc two independent heat sources, such as: laser heat source has high energy density, excellent directivity, and transparent medium conduction characteristics, arc plasma has high heat-electricity Conversion efficiency, low equipment cost, operating cost, mature technology and other advantages, so laser-arc hybrid welding largely avoids their respective shortcomings, such as: laser energy loss caused by high reflectivity of metal materials to laser , high equipment cost of laser equipment, low electro-optical conversion efficiency, etc., low energy density of arc heat source, poor discharge stability when moving at high speed, etc. At the same time, the organic combination of laser welding and ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02
CPCB23K26/348B23K28/02
Inventor 廖妤
Owner 上海涵涌科技有限公司