Laser butt welding method for tantalum 10 tungsten alloy and TC4 alloy

Abstract

A laser butt welding method for a tantalum 10 tungsten alloy and a TC4 alloy comprises the following steps that the butt joint faces of a tantalum 10 tungsten alloy plate and a TC4 alloy plate are polished respectively; the polished plate is put into an ultrasonic container to be cleaned; wiping the cleaned plate by using a towel with alcohol, and airing for later use; the tantalum 10 tungsten alloy plate and the TC4 alloy plate are spliced on a welding platform of a collaborative robot laser welding machine, and it is guaranteed that the plates are located on the same horizontal plane; the starting point and the ending point of welding are determined through a magnifying lens on the welding plane; a collaborative robot laser welding machine is used for welding the tantalum 10 tungsten alloy plate and the TC4 alloy plate according to the following parameters that the beam deflection distance ranges from 0.05 mm to 0.08 mm, the laser power ranges from 2.4 Kw to 2.6 Kw, the welding speed ranges from 1.2 m / min to 1.5 m / min, the shielding gas flow ranges from 15 L / min to 18 L / min, and the light spot diameter ranges from 0.06 mm to 0.08 mm. The method is high in welding speed, small in heat affected zone and suitable for welding of large workpieces; and the welding tensile strength mechanical property can be guaranteed, and butt joint edges are better fused.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy welding, and in particular to a laser welding method for tantalum 10 tungsten alloy and TC4 alloy. Background Art

[0002] Tantalum 10 tungsten alloy has the characteristics of high temperature resistance, chemical stability and good processing performance. It is an indispensable and important material in the fields of aerospace, nuclear industry and high temperature technology, and has broad application prospects. However, tantalum tungsten alloy is expensive and has a high density. Large-scale use will increase the cost and product weight. The welding structure of tantalum tungsten alloy and TC4 alloy can reduce the cost and weight. The quicker way is to weld these two alloys into a combined material, which can achieve the effect of combining the advantages of tantalum tungsten alloy and titanium alloy.

[0003] At present, the existing technology mainly uses electron beam welding to weld tantalum 10 tungsten alloy and TC4 alloy, but electron beam welding requires a closed space and welding under vacuum. The welding size is relatively small and many large workpieces cannot be welded. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned technology, it is necessary to provide a laser butt welding method for tantalum 10 tungsten alloy and TC4 alloy.

[0005] A laser welding method for tantalum 10 tungsten alloy and TC4 alloy comprises the following steps: S1: Grinding the butt joint surfaces of the tantalum 10 tungsten alloy plate and the TC4 alloy plate respectively; S2: Put the two polished plates into an ultrasonic container for cleaning; S3: Wipe the two cleaned plates with a towel soaked in alcohol and let them dry for later use; S4: Splice the spare tantalum 10 tungsten alloy plate and TC4 alloy plate on the welding platform of the collaborative robot laser welding machine. When splicing the two alloy plates, fix and clamp the two alloy plates and ensure that they are on the same horizontal plane; S5: Adjust the collaborative robot laser welding machine and use the magnifying glass on the welding plane to determine the starting and ending points of the welding; S6: Use the collaborative robot laser welding machine to weld the tantalum 10 tungsten alloy plate and the TC4 alloy plate according to the following parameters. Among them, the deflection distance is 0.05-0.08mm, the laser power is 2.4-2.6Kw, the welding speed is 1.2-1.5m / min, the shielding gas flow rate is 15-18L / min, and the spot diameter is 0.06-0.08mm.

[0006] Preferably, in step S1, the butting surfaces of the tantalum 10 tungsten alloy plate and the TC4 alloy plate are polished in sequence using sandpapers of 200 mesh, 400 mesh, and 800 mesh.

[0007] Preferably, in step S2, a small amount of degreasing agent needs to be added during cleaning.

[0008] Preferably, in step S4, when the tantalum 10 tungsten alloy plate and the TC4 alloy plate are spliced, a gap of less than 0.1 mm is left.

[0009] Preferably, argon is used as the protective gas.

[0010] Compared with the prior art, the laser butt welding method of tantalum 10 tungsten alloy and TC4 alloy provided by the present invention has the advantages of fast welding speed, small heat-affected zone, beautiful welding shape, and relatively high depth. Large workpieces can be welded under argon protection; it can solve the problems of poor welding tensile strength and mechanical properties, non-fusion of butt edges, and welding thermal cracks during butt welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0012] Figure 1 It is a schematic diagram of the fixing method of the tantalum 10 tungsten alloy and the TC4 alloy of the present invention.

[0013] Figure 2 The schematic diagram of the welding starting point and welding end point is invented.

[0014] Figure 3 It is a schematic diagram of the weld between the tantalum 10 tungsten alloy and the TC4 alloy of the present invention.

[0015] Figure 4 This is the X-ray scanning test result of the welding sample of the present invention.

[0016] Figure 5 This is the mechanical tensile test result of the welding sample of tantalum 10 tungsten alloy and TC4 of the present invention.

[0017] Figure 6 Schematic diagram of the weld condition of the comparative welding sample.

[0018] Figure 7 This is the mechanical tensile condition of the comparative welding sample.

[0019] In the figure: Tantalum 10 tungsten alloy 1, TC4 alloy 2. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Comparative Example: The two prepared tantalum 10 tungsten alloy plates and TC4 alloy materials are fixed on the welding platform of the collaborative robot laser welding machine. The gap between the two alloy metals is less than 0.1mm when they are spliced. The two alloy plates are fixed and tightened to ensure that they are on the same horizontal plane. Adjust the collaborative robot laser welding machine and use the magnifying glass on the welding plane to determine the starting and ending points of welding. This is a collaborative robot teaching process. After adjusting parameters such as welding power and welding speed, the program is written and then welding is started. Welding is performed according to the following parameters: Welding model Beam deviation distance (mm) Laser power(Kw) Welding speed (m / min) Shielding gas pressure (L / min) Spot diameter (mm) HW6000-HS15 0 2.5-2.7 2-2.5 10-15 0.08-1.0 like Figure 6 As shown, the sample weld is analyzed. From the analysis of the weld surface, it can be seen that the shielding gas pressure may be insufficient, the surface is slightly oxidized, and the welding speed is too fast, causing the weld to be piled up.

[0022] After X-ray inspection, there are certain small pores and bubbles inside, and the edges are not welded through.

[0023] like Figure 7 As shown, the welded samples were cut into room temperature tensile samples for tensile testing as required. The test results were not ideal, the mechanical properties were unqualified, the yield strength was low, and fractures occurred in the welds. Example

[0024] A laser welding method for tantalum 10 tungsten alloy and TC4 alloy comprises the following steps: S1: Grinding the butt joint surfaces of the tantalum 10 tungsten alloy plate and the TC4 alloy plate respectively; S2: Put the two polished plates into an ultrasonic container for cleaning; S3: Wipe the two cleaned plates with a towel soaked in alcohol and let them dry for later use; S4: Splice the spare tantalum 10 tungsten alloy plate and TC4 alloy plate on the welding platform of the collaborative robot laser welding machine. When splicing the two alloy plates, fix and clamp the two alloy plates and ensure that they are on the same horizontal plane; S5: Adjust the collaborative robot laser welding machine and use the magnifying glass on the welding plane to determine the starting and ending points of the welding; S6: Use the collaborative robot laser welding machine to weld the tantalum 10 tungsten alloy plate and the TC4 alloy plate according to the following parameters. Among them, the deflection distance is 0.05-0.08mm, the laser power is 2.4-2.6Kw, the welding speed is 1.2-1.5m / min, argon is used as the shielding gas, the shielding gas flow rate is 15-18L / min, and the spot diameter is 0.06-0.08mm.

[0025] To explain more specifically, in step S1, the butting surfaces of the tantalum 10 tungsten alloy plate and the TC4 alloy plate are polished in sequence using sandpapers of 200 mesh, 400 mesh, and 800 mesh.

[0026] To explain more specifically, in step S2, a small amount of degreasing agent needs to be added during cleaning.

[0027] To explain more specifically, in step S4, when the tantalum 10 tungsten alloy plate and the TC4 alloy plate are spliced, the gap left is less than 0.1 mm.

[0028] Please see Figure 3 The welds of the tantalum 10 tungsten alloy plate and the TC4 alloy plate were inspected. It was observed that the weld sample was fully penetrated. From the analysis of the weld sample weld, there was no oxidation on the surface, the surface was uniform without obvious protrusions, and no accumulation occurred.

[0029] Please see Figure 4 , perform X-ray inspection on the welding samples, and send them for X-ray scanning inspection after welding to confirm whether there are defects such as cracks and bubbles inside the weld.

[0030] Please see Figure 5 , mechanical tensile test was carried out on the welding sample. 4 specimens were cut from the welding sample and mechanical tensile test was carried out respectively. After the mechanical tensile test, the tensile strength of the welding sample was able to reach 80% of the parent material. The welding test was successful and the welding of the two alloys was achieved.

[0031] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A laser butt welding method for tantalum 10 tungsten alloy and TC4 alloy, characterized in that: The following steps are included: S1: Grinding the butt joint surfaces of the tantalum 10 tungsten alloy plate and the TC4 alloy plate respectively; S2: Put the two polished plates into an ultrasonic container for cleaning; S3: Wipe the two cleaned plates with a towel soaked in alcohol and dry them for later use; S4: Splice the spare tantalum 10 tungsten alloy plate and TC4 alloy plate on the welding platform of the collaborative robot laser welding machine. When splicing the two alloy plates, fix and clamp the two alloy plates and ensure that they are on the same horizontal plane; S5: Adjust the collaborative robot laser welding machine and use the magnifying glass on the welding plane to determine the starting and ending points of the welding; S6: Use the collaborative robot laser welding machine to weld the tantalum 10 tungsten alloy plate and the TC4 alloy plate according to the following parameters. Among them, the deflection distance is 0.05-0.08mm, the laser power is 2.4-2.6Kw, the welding speed is 1.2-1.5m / min, the shielding gas flow rate is 15-18L / min, and the spot diameter is 0.06-0.08mm.

2. The laser butt welding method of tantalum 10 tungsten alloy and TC4 alloy according to claim 1, characterized in that: In step S1, the butt joint surfaces of the tantalum 10 tungsten alloy plate and the TC4 alloy plate are polished in sequence using sandpapers of 200 mesh, 400 mesh, and 800 mesh.

3. The laser butt welding method of tantalum 10 tungsten alloy and TC4 alloy according to claim 2, characterized in that: In step S2, a small amount of degreasing agent needs to be added during cleaning.

4. The laser butt welding method of tantalum 10 tungsten alloy and TC4 alloy according to any one of claims 1 to 3, characterized in that: In step S4, when the tantalum 10 tungsten alloy plate and the TC4 alloy plate are spliced, the gap left is less than 0.1 mm.

5. The laser butt welding method of tantalum 10 tungsten alloy and TC4 alloy according to claim 4, characterized in that: The protective gas used is argon.

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