A connection method based on laser additive manufacturing assisted by tig arc synchronous preheating
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A connection method and arc technology, applied in laser welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of low laser utilization rate, crack sensitivity, large cracks, etc., and achieve low laser absorption rate, low cost, and easy control Effect
Inactive Publication Date: 2017-07-28
HARBIN INST OF TECH
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[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. A joining method based on laser additive manufacturing assisted by TIG arc synchronous preheating is proposed
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specific Embodiment approach 1
[0025] Specific embodiment one: a kind of TIG electric arc synchronous preheating auxiliary of the present embodiment is based on the connection method of laser additive manufacturing, and it is carried out according to the following steps:
[0026] 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;
[0027] Step 2: Set process parameters:
[0028] Preheating part:
[0029] The current is 20A~60A, the shielding gas flow rate is 5L / min~20L / min, the inclination angle of the welding torch is 5°~15°, and the distance d between the center of the arc and the center of the laser spot is 5mm~20mm;
[0030] Welding part:
[0031] 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~...
specific Embodiment approach 2
[0036] Specific Embodiment 2: The difference between this embodiment and Specific Embodiment 1 is that the laser emitting laser is a semiconductor laser, CO 2 Gas laser, YAG solid state laser or fiber laser. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0037] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the process parameters of the preheating part are: the current is 30A-60A, the shielding gas flow rate is 8L / min-20L / min, and the inclination angle of the welding torch is 8°- 15°, the distance d between the center of the arc and the center of the laser spot is 8mm to 20mm. Others are the same as in the first embodiment.
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Abstract
The invention provides a TIG (tungsten inert gas welding) arc synchronous preheating assisted connection method based on laser additive manufacturing, relates to a novel material laser welding method and solves the problems that Ti-Al intermetallic compound materials, high-temperature alloys, aluminum alloys and the like are sensitive to laser welding cracks, materials reflecting laser severely are likely to crack or have other defects during welding, the laser utilization rate is low and the like. According to the method, a to-be-welded workpiece is processed, polished and washed, a technological parameter is set, and welding is performed. TIG arc is taken as a preheating heat source, crack sensitivity proneness of the material is reduced in the welding process, and the defects of low laser absorption rate of the material, high energy consumption in the welding process and the like are effectively overcome; meanwhile, the TIG arc is stable, easy to control and low in cost, has a cathode atomization function and can effectively remove an oxide film on the surface of the material.
Description
technical field [0001] The invention relates to a new method of laser welding of materials, specifically a method of synchronous preheating of TIG electric arc in the process of adopting a 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 stren...
Claims
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