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A connection method based on laser additive manufacturing assisted by electromagnetic induction synchronous preheating

An electromagnetic induction and connection method technology, applied in the field of material processing engineering, can solve problems such as crack sensitivity, low laser utilization rate, and large cracks, and achieve the effects of improving microstructure, improving low laser absorption rate, and improving performance

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems such as large tendency of defects such as cracks and low laser utilization rate in welding of materials that are sensitive to laser welding cracks, such as Ti-Al intermetallic compound materials, superalloys, and aluminum alloys, and have serious laser reflection. Proposed a connection method based on laser additive manufacturing assisted by electromagnetic induction synchronous preheating

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  • A connection method based on laser additive manufacturing assisted by electromagnetic induction synchronous preheating

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specific Embodiment approach 1

[0020] Specific implementation mode one: a kind of electromagnetic induction synchronous preheating assisted connection method based on laser additive manufacturing in this embodiment, it is to carry out according to the following content:

[0021] Step 1: Process the position of the workpiece to be welded into a V-shaped groove, and clean and polish the surface of the groove and nearby positions, and fix the workpiece to be welded on the workbench with a fixture;

[0022] Step 2: Set process parameters:

[0023] Preheating part:

[0024] The induction current is 300A~1000A, the control preheating temperature is 100℃~200℃, and the distance d between the center of the induction coil and the center of the laser spot is 5mm~18mm;

[0025] Welding part:

[0026] The laser power is 300W~4000W, the spot diameter is 1mm~4mm, the welding speed is 3mm / s~40mm / s, the powder feeding speed is 2g / min~25g / min, the powder feeding carrier gas flow rate is 3L / min~12L / min , the shielding gas ...

specific Embodiment approach 2

[0029] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the process parameters of the preheating part are: the induction current is 500A-1000A, the control preheating temperature is 120°C-200°C, the center of the induction coil and the center of the laser spot The distance d is 8 mm to 18 mm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the process parameters of the preheating part are: the induction current is 800A-1000A, the control preheating temperature is 150°C-200°C, the center of the induction coil and the center of the laser spot The distance d is 10 mm to 18 mm. Others are the same as in the first embodiment.

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Abstract

The invention relates to a connecting method, in particular to a connecting method assisted by electro-magnetic induction synchronous preheating and based on laser additive manufacturing. The problems that Ti-Al system intermetallic compound materials, high-temperature alloy, aluminum alloy and the like are sensitive to laser welding cracks, materials serious in laser reflection are prone to defects like cracks during welding, and the laser utilization rate is small are solved. The method includes the steps that a workpiece to be welded is machined, ground and cleaned; process parameters are set, and welding is carried out. An electro-magnetic induction coil serves as a preheating heat source, the crack sensitivity tendency of the materials in the welding process is relieved, the defects that the materials are low in laser adsorption rate, large in energy consumption in the welding process and the like are effectively relieved, and the laser utilization rate is improved. Meanwhile, the welding joint and peripheral materials are heated in an induction mode, the temperature gradient of the area around the welding joint in the welding process is reduced, the micro structure after welding can be effectively improved, and the performance of a welding connector is improved.

Description

technical field [0001] The invention relates to a new method of laser welding of materials, specifically a method of synchronous preheating by electromagnetic induction during the connection method based on laser additive manufacturing, and belongs to the field of material processing engineering. Background technique [0002] Ti-Al intermetallic compound material alloy has excellent properties such as high specific strength, low density, good fracture toughness and strong creep resistance, and has become a research hotspot of high-temperature structural materials. As a traditional Ti alloy and high-density nickel-based superalloy Alternative materials are given great attention. In Ti-Al intermetallic compounds, Ti 3 Al, TiAl and TiAl 3 research is more extensive. [0003] At present, the welding of Ti-Al intermetallic compound materials in the literature is mostly concentrated in arc welding, diffusion welding and electron beam welding. It is found that the strength of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/24B23K26/12B23K26/60B23K26/32B23K26/70
CPCB23K26/123B23K26/24
Inventor 雷正龙张恒泉黎炳蔚李鹏郭涛陈彦宾
Owner HARBIN INST OF TECH
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