阅读说明：本技术 一种激光熔敷多股绞合焊丝及其制备工艺 (Laser deposited multi-strand stranded welding wire and preparation process thereof ) 是由 梁裕 李宏伟 高金良 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种激光熔敷多股绞合焊丝的制备工艺,包括如下步骤：将药芯粉末的原料分别进行热处理3-6h,热处理温度为150-220℃,冷却,混合均匀得到药芯粉末；采用钢带包裹药芯粉末,粗拉拔,再进行精拉拔,绞制得到激光熔敷多股绞合焊丝。本发明公开了上述激光熔敷多股绞合焊丝焊接工艺,包括如下步骤：将母材表面去污,接着进行热处理；将上述激光熔敷多股绞合焊丝进行预热,然后进行激光熔覆；激光熔覆过程中,采用上述预热后激光熔敷多股绞合焊丝以焊缝为中心线进行两侧对称熔敷；激光熔敷后打磨焊接接头表面,去除表面发黑区域。(The invention discloses a preparation process of a laser deposited multi-strand stranded welding wire, which comprises the following steps: respectively carrying out heat treatment on the raw materials of the flux-cored powder for 3-6h at the heat treatment temperature of 150-; and coating the flux-cored powder by using a steel belt, roughly drawing, finely drawing and stranding to obtain the laser deposited multi-strand stranded welding wire. The invention discloses a welding process of the laser deposited multi-strand stranded welding wire, which comprises the following steps of: decontaminating the surface of the parent metal, and then carrying out heat treatment; preheating the laser cladding multi-strand stranded welding wire, and then carrying out laser cladding; in the laser cladding process, the preheated laser cladding stranded welding wires are adopted to carry out bilateral symmetry cladding by taking the welding seam as a central line; and polishing the surface of the welding joint after laser cladding, and removing a blackened surface area.)

1. A preparation process of a laser deposited multi-strand stranded welding wire is characterized by comprising the following steps:

s1, respectively carrying out heat treatment on the raw materials of the flux-cored powder for 3-6h at the heat treatment temperature of 150-220 ℃, cooling, and uniformly mixing to obtain the flux-cored powder;

and S2, wrapping the flux-cored powder by using a steel belt, roughly drawing, finely drawing and stranding to obtain the laser deposited multi-strand stranded welding wire.

2. The process for preparing a laser-deposited stranded welding wire according to claim 1, wherein in S1, the flux-cored powder comprises the following raw materials in percentage by mass: 12-18% of silicon carbide, 2-8% of feldspar, 2-3% of ferromanganese, 10-16% of high-carbon ferrochromium, 1-4% of molybdenum powder, 1-5% of calcium fluoride, 0.5-1.8% of boron carbide, 1-2% of scandium-silicon-iron apatite and the balance of tungsten carbide.

3. The process of preparing a laser-deposited stranded welding wire of claim 2, wherein the silicon carbide has a grain size of 50 to 100 μm; the grain size of the tungsten carbide is 38-74 mu m; the mesh number of the high-carbon ferrochrome, the feldspar, the calcium fluoride, the boron carbide, the ferromanganese, the molybdenum powder and the scandium-silicon-iron limestone is 100-200 meshes.

4. The process of claim 1, wherein the mass ratio of steel strip to flux core powder in S2 is 5-7: 3-4.

5. The process of claim 1, wherein in S2, a drawing die with a 4-6mm diameter is used during the rough drawing process.

6. The process of claim 1, wherein the laser deposited stranded wire has a diameter of 1-2mm at S2.

7. A laser-deposited stranded welding wire produced by the process for producing a laser-deposited stranded welding wire according to any one of claims 1 to 6.

8. A laser deposited stranded wire welding process as defined in claim 7, comprising the steps of:

(1) decontaminating the surface of the parent metal, and then carrying out heat treatment;

(2) preheating the laser deposited stranded wire of claim 7 and then laser cladding; in the laser cladding process, the preheated laser cladding stranded welding wire is adopted to carry out bilateral symmetry cladding by taking a welding seam as a central line, the wire feeding speed is 0.8-1.2m/min, the cladding speed is 1.8-2.2m/min, the laser power is 7.5-8.5kW, and the diameter of a light spot is 4 mm;

(3) and polishing the surface of the welding joint after laser cladding, and removing a blackened surface area.

9. The welding process of claim 8, wherein in step (1), the heat treatment is performed to a base metal temperature of 200-300 ℃.

Technical Field

The invention relates to the technical field of stranded welding wires, in particular to a laser deposited multi-strand stranded welding wire and a preparation process and a welding process thereof.

Background

Laser has the characteristics of high brightness, strong directivity, strong monochromaticity and the like, and is increasingly applied to various fields as a novel surface treatment technology. The laser cladding principle is that a high-energy laser beam is used for melting a flux-cored wire on the surface of a base metal and forming a cladding layer which is metallurgically bonded with the base metal. The productivity and the product quality of a plurality of devices are determined by the service life of the devices, and the laser cladding technology can improve the service characteristics of the devices, so that the surfaces of the devices have the performances of wear resistance, high temperature resistance, impact resistance and the like, thereby prolonging the service life of the devices.

The laser cladding needs to be carried out by using a specific flux-cored wire for melting and filling, and the laser cladding materials widely applied at present mainly comprise: the flux-cored wire is made of nickel-based, cobalt-based, iron-based alloy, tungsten carbide composite materials and the like, but the existing flux-cored wire generally cannot meet the requirements of laser cladding operation, and the joint of the flux-cored wire is low in tensile strength, easy to wear and poor in mechanical property.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a laser deposited multi-strand stranded welding wire and a preparation process and a welding process thereof.

A preparation process of a laser deposited multi-strand stranded welding wire comprises the following steps:

s1, respectively carrying out heat treatment on the raw materials of the flux-cored powder for 3-6h at the heat treatment temperature of 150-220 ℃, cooling, and uniformly mixing to obtain the flux-cored powder;

and S2, wrapping the flux-cored powder by using a steel belt, roughly drawing, finely drawing and stranding to obtain the laser deposited multi-strand stranded welding wire.

Preferably, in S1, the flux core powder includes the following raw materials by mass percent: 12-18% of silicon carbide, 2-8% of feldspar, 2-3% of ferromanganese, 10-16% of high-carbon ferrochromium, 1-4% of molybdenum powder, 1-5% of calcium fluoride, 0.5-1.8% of boron carbide, 1-2% of scandium-silicon-iron apatite and the balance of tungsten carbide.

Preferably, the silicon carbide particle size is 50-100 μm; the grain size of the tungsten carbide is 38-74 mu m; the mesh number of the high-carbon ferrochrome, the feldspar, the calcium fluoride, the boron carbide, the ferromanganese, the molybdenum powder and the scandium-silicon-iron limestone is 100-200 meshes.

Preferably, in S2, the mass ratio of the steel strip to the flux core powder is 5-7: 3-4.

Preferably, in S2, a drawing die with a hole diameter of 4-6mm is used in the course of rough drawing.

Preferably, the laser deposited stranded welding wire has a diameter of 1-2mm in S2.

A laser deposited multi-strand stranded welding wire is prepared by adopting the preparation process of the preheated laser deposited multi-strand stranded welding wire.

The welding process of the laser deposited multi-strand stranded welding wire comprises the following steps:

(1) decontaminating the surface of the parent metal, and then carrying out heat treatment;

(2) preheating the laser deposited stranded wire of claim 7 and then laser cladding; in the laser cladding process, the preheated laser cladding stranded welding wire is adopted to carry out bilateral symmetry cladding by taking a welding seam as a central line, the wire feeding speed is 0.8-1.2m/min, the cladding speed is 1.8-2.2m/min, the laser power is 7.5-8.5kW, and the diameter of a light spot is 4 mm;

(3) and polishing the surface of the welding joint after laser cladding, and removing a blackened surface area.

Preferably, in the step (1), the heat treatment is performed so that the base material temperature is 200-.

The invention has the following technical effects:

(1) scandium-silicon-iron limestone can form dispersed phase particles distributed in a welding seam in the laser cladding process, cross sliding and uniform deformation of crystals are promoted, silicon carbide can improve the fluidity of metal, so that a welding wire is easy to form, the scandium-silicon-iron limestone is matched with the action of the scandium-silicon-iron limestone, even if a molten pool of laser cladding is cooled, solidified and crystallized quickly, solidification cracks are obviously inhibited, the surface of an obtained welding joint is uniform and well formed, the probability of cracks, air holes and other defects of a laser cladding layer is reduced, the wear coefficient of the surface of the laser cladding layer is improved, and the service life is prolonged;

(2) by preheating the welding material and the base material, the base material and the welding material have a large amount of energy before laser cladding welding, light spots can fully melt the surface of the base material to form a molten pool, a welding wire and the base material are fully smelted to form metallurgical bonding, the components are uniformly distributed, and the formability of a cladding layer is ensured;

(3) the welding wire is adopted to be subjected to laser cladding, the thickness of a cladding layer is 0.8-1.2mm, the surface is smooth, the defects such as cracks and air holes are avoided, the cladding layer and a base metal are combined to be metallurgically combined, the comprehensive performance is good, a room temperature tensile mechanical property test is carried out on a joint after cladding according to GB/T228-2002 metal material room temperature tensile test method, the tensile strength of the welded joint can reach 420MPa, the hardness of the cladding layer is 50-56HRC, the wear coefficient epsilon is 30-34, and the welding wire is suitable for mechanical parts or equipment with high requirements on wear resistance and mechanical property.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to specific examples.