Method for producing wide and heavy-coil titanium bronze alloy strip at low cost

Abstract

The invention belongs to the technical field of copper alloy production and processing technologies, and discloses a method for producing a wide and heavy-coil titanium bronze alloy strip with low cost. Comprising the steps that one side of a first hot-rolled titanium bronze alloy plate and one side (perpendicular to the rolling direction or parallel to the rolling direction) of a second hot-rolled titanium bronze alloy plate are in butt joint and fixed; welding the butt seam of the first hot-rolled titanium bronze alloy plate and the second hot-rolled titanium bronze alloy plate in a friction stir welding manner, and then performing stress relief annealing on the weld seam; and the process is repeated, the multiple hot-rolled titanium bronze alloy plates are welded into an integral structure, then cold rolling is conducted, and the titanium bronze alloy strip is obtained. The titanium bronze alloy plates are connected through friction stir welding, so that the titanium bronze alloy plates are wide in width and large in coil weight, continuous production is facilitated, and the production cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of copper alloy production and processing technology, and particularly relates to a method for producing wide-width and large-roll-weight titanium bronze alloy strips at low cost. Background Art

[0002] With the progress of science and technology and the development of modern industrial equipment, new requirements are put forward for the comprehensive performance of copper alloys, expecting them to have high strength while maintaining high electrical conductivity. Beryllium copper alloy is a representative of high-conductivity and high-strength copper alloys. However, beryllium copper alloy will produce toxic fumes during the production process, which will seriously endanger human health and environmental pollution. At the same time, the production of beryllium copper alloy has the disadvantages of long production cycle, low yield, high energy consumption and high product price. Therefore, scientists at home and abroad have gradually developed a series of elastic copper alloy materials with excellent performance in recent years to partially replace beryllium copper alloy. Among them, with the continuous in-depth research on Cu-Ti alloy by scientific workers, the research results show that Cu-Ti alloy has broad applications in electrical contact components due to its excellent yield strength, elastic limit, electrical conductivity, ductility and fatigue resistance.

[0003] During the melting process of Cu-Ti alloy, titanium is sensitive to elements such as oxygen and nitrogen, and is prone to defects such as inclusions and pores. At the same time, during the solidification process, it is prone to porosity, shrinkage cavities and macro / micro segregation, etc., making it difficult to prepare large-size and high-quality ingots, so the production of wide-width and large-roll-weight titanium bronze strips cannot be achieved. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a method for producing wide-width and large-roll-weight titanium bronze alloy strips at low cost. The present invention uses friction stir welding to connect titanium bronze alloy plates to achieve wide-width and large-roll-weight of titanium bronze alloy plates, which is conducive to continuous production and reduces production costs.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A method for producing wide-width and large-roll-weight titanium bronze alloy strips at low cost, including the following process: Butt-join and fix one side of the first hot-rolled titanium bronze alloy plate with one side of the second hot-rolled titanium bronze alloy plate (the side perpendicular to the rolling direction or the side parallel to the rolling direction); Weld the butt joint of the first hot-rolled titanium bronze alloy plate and the second hot-rolled titanium bronze alloy plate by friction stir welding, and then perform stress relief annealing on the weld; Repeat the above process to weld several hot-rolled titanium bronze alloy plates into an integral structure, and then perform cold rolling to obtain titanium bronze alloy strips.

[0006] Preferably, the method for low-cost production of wide-width and large-roll-weight titanium bronze alloy strips of the present invention further includes the following process: At the edge position of the side where the first hot-rolled titanium bronze alloy sheet and the second hot-rolled titanium bronze alloy sheet need to be butted, along the length direction of this side, a number of blind holes are spaced apart and opened. The blind holes are filled with iron powder, and then welding is carried out at the butting seam by friction stir welding.

[0007] Preferably, the diameter of the blind hole is 1 - 1.5 mm, the depth is 0.5 - 1 mm, the hole pitch is 4 - 6 mm, and the distance from the hole center to the plate edge is 1.5 - 2 mm.

[0008] Preferably, when welding at the butting seam by friction stir welding, the diameter of the stirring pin used is 1.5 - 3 mm.

[0009] Preferably, when welding at the butting seam by friction stir welding, the rotational speed of the stirring head is 750 - 1200 r / min, the processing speed is 80 - 100 mm / min, and the tilt angle of the stirring head is 1.5° - 2.5°. The tilt angle of the stirring head is the angle between the axis of the stirring head and the perpendicular line of the first hot-rolled titanium bronze alloy sheet. The first hot-rolled titanium bronze alloy sheet and the second hot-rolled titanium bronze alloy sheet are parallel and coplanar.

[0010] Preferably, when stress relief annealing is carried out on the weld seam, the annealing holding temperature is 440 - 460 °C, and the holding time is 1.5 - 2.0 h.

[0011] Preferably, when cold rolling is carried out, the deformation amount per pass is 8% - 12%, and the total deformation amount is 80% - 90%.

[0012] Preferably, in terms of mass percentage, the components of the first hot-rolled titanium bronze alloy sheet and the second hot-rolled titanium bronze alloy sheet are: Ti: 3% - 4.5%, and the rest is Cu.

[0013] Preferably, the processing process of the first hot-rolled titanium bronze alloy sheet and the second hot-rolled titanium bronze alloy sheet is as follows: Heat the forged titanium bronze alloy slab to the rolling start temperature of 800 - 900 °C, and then carry out hot rolling. The final rolling temperature is controlled at 590 - 610 °C, and the deformation amount is controlled at 38% - 42%.

[0014] The present invention also provides a titanium bronze alloy strip, which is processed by the method of the present invention described above.

[0015] The present invention has the following technical effects compared with the prior art: The method for low-cost production of wide-width and large-roll-weight titanium bronze alloy strips specifically uses friction stir welding to connect hot-rolled titanium bronze alloy plates into wide-width long-scale strips, solves the problem that it is difficult to prepare large-sized high-quality billets by existing melting technologies, provides guidance for increasing the roll weight of titanium bronze alloys, and in addition, the solid-phase connection technology of friction stir welding can effectively avoid welding defects such as porosity and cracks easily formed in the traditional fusion welding process, improves the welding quality, reduces the risk of weld cracking during the cold deformation process, and provides a process and method for the preparation of large-sized titanium bronze alloy strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Fig. 1(a) is the first schematic diagram of the friction stir welding method in the present invention; Fig. 1(b) is the second schematic diagram of the friction stir welding method in the present invention; Fig. 2(a) is the first schematic diagram showing the relationship between the welding direction and the rolling direction in the present invention; Fig. 2(b) is the second schematic diagram showing the relationship between the welding direction and the rolling direction in the present invention; Figure 3 is the first schematic diagram of the blind hole arrangement in the present invention; Figure 4 is the heat treatment process route diagram in the present invention; Figure 5 is the microstructure diagram of the hot-rolled state in Step 1 of Example 1 of the present invention; Figure 6 is the microstructure diagram after welding in Step 2 of Example 1 of the present invention; Figure 7 is the macroscopic view of cold rolling in Example 1 of the present invention; In the figure, 1 - clamping section, 2 - connected shoulder, 3 - stirring pin, 4 - titanium bronze alloy plate, 5 - butt joint, 6 - blind hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0018] Friction stir welding stands out as an advanced solid-phase joining technology. Its working principle is that friction stirring significantly raises the temperature in the weld nugget zone, causing the material to plasticize. The stirring pin agitates the material, resulting in plastic flow and mixing, thus forming a dense and defect-free weld. The welded joints obtained by this method have a high degree of homogenization and fine grain size, and their properties are significantly better than those of traditional welding, which can ensure sufficient strength during the cold rolling process and prevent problems such as cracks and broken belts.

[0019] To meet the requirements of producing wide-width and large-coil-weight titanium bronze alloy strips and overcome the deficiencies of the existing technology, the present invention proposes a method for producing wide-width and large-coil-weight titanium bronze alloy strips at low cost. Friction stir welding is used to connect titanium bronze alloy plates to achieve wide-width and large-coil-weight of titanium bronze alloy plates, which is conducive to continuous production and reduces production costs.

[0020] The method for producing wide-width and large-coil-weight titanium bronze alloy strips at low cost according to the present invention includes the following steps: Step 1: Heat the forged titanium bronze alloy slab to 800 - 850 °C and hold for a certain time. After the forged titanium bronze alloy slab is uniform, take it out of the furnace. Immediately after taking it out of the furnace, roll the forged titanium bronze alloy slab to obtain a hot-rolled titanium bronze alloy plate. The final rolling temperature of the hot rolling is controlled at 600 ± 10 °C, and the deformation amount is 40% ± 2%. Among them, in terms of mass percentage, the components of the forged titanium bronze alloy slab are: Ti: 3% - 4.5%, and the rest is Cu.

[0021] Step 2: Referring to Figure 1, Figure 2(a) and Figure 2(b), butt and fix one side of two hot-rolled titanium bronze alloy plates, and then use a stirring head to perform friction stir welding on the hot-rolled titanium bronze alloy plates along the butt joint.

[0022] Or, referring to Figure 3 , it is also possible to drill holes and add powder on the butt edges of the hot-rolled titanium bronze alloy plates. Among them, the drilled holes are blind holes. The diameter of the opened blind holes is 1 - 1.5 mm, the depth is 0.5 - 1 mm, the hole spacing is 4 - 6 mm, and the distance from the hole center to the plate edge is 1.5 - 2 mm. The added powder is pure iron powder. The butt joint methods include butt joint along the rolling direction (see Figure 2(a)) and butt joint perpendicular to the rolling direction (see Figure 2(b)). After butt joint and fixation, then use a stirring head to perform friction stir welding on the hot-rolled titanium bronze alloy plates along the butt joint. In this solution, drilling holes and adding iron powder before friction stir welding forms a Cu-Ti-Fe alloy with high strength and high conductivity by means of friction stir alloying processing. The grain size of the Cu-Ti-Fe alloy structure is finer, and it can promote the precipitation of Ti elements during the aging process, enhance precipitation strengthening, and improve the alloy properties.

[0023] During the above process, when the stirring head performs friction stir welding on the titanium bronze alloy plate, the rotational speed of the stirring head is 750 - 1200 r / min, the processing speed is 80 - 100 mm / min, the inclination angle of the stirring head is 2° ± 0.5°, as shown in Fig. 1(b). The inclination angle of the stirring head refers to the angle between the axis of the stirring head and the perpendicular line of the substrate, and post-weld heat treatment is carried out. This heat treatment is stress relief annealing, the annealing holding temperature is 450 ± 10 °C, and the holding time is 1.5 - 2.0 h. The stirring head used in friction stir welding includes a clamping section 1, a connected shoulder 2 and a stirring pin 3. The diameter of the shoulder is 12 mm, and the diameter of the stirring pin is 1.5 - 3 mm.

[0024] Step 3: Connect several hot-rolled titanium bronze alloy plates into an integral structure through the process of Step 2, and then cold-roll the welded plates to obtain titanium bronze alloy welded plates that do not break after cold rolling. The cold rolling is carried out at room temperature, and the cold rolling parameters are that the deformation per pass is 10% ± 2%, and the total deformation is 80% - 90%.

[0025] In the above parameters, the value after the "±" sign is the deviation of the corresponding parameter during actual execution, and the value before the "±" sign is the set value of the corresponding parameter during actual execution.

[0026] Example 1 The specific process flow of the method for low-cost production of wide-width and large coil-weight titanium bronze alloy strips in this example is as follows: Step 1: Heat the forged titanium bronze alloy slab to 850 °C and hold for 10 min. After taking it out of the furnace, immediately roll the forged titanium bronze alloy slab, and the rolling deformation is 40%.

[0027] Step 2: After the hot-rolled titanium bronze alloy plate cools, butt-join two plates perpendicular to the rolling direction and fix them on the welding table. Weld with the parameters of the rotational speed of the stirring head being 750 r / min, the processing speed being 80 mm / min, and the inclination angle of the stirring head being 2°. The post-weld heat treatment temperature is 450 °C, and the holding time is 1.5 h.

[0028] Step 3: Use sandpaper to polish the welded plate into a smooth surface, and cold-roll the polished plate. The cold rolling process parameters are that the deformation per pass is 10%, and the total deformation is 90%.

[0029] Example 2 The specific process flow of the method for low-cost production of wide-width and large coil-weight titanium bronze alloy strips in this example is as follows: Step 1: Heat the forged titanium bronze alloy slab to 800 °C and hold for 10 min. After taking it out of the furnace, immediately roll the forged titanium bronze alloy slab, and the rolling deformation is 40%.

[0030] Step 2: After the hot-rolled titanium bronze alloy plate is cooled, butt-join two plates perpendicular to the rolling direction and fix them on the welding table. Weld them with the parameters of a stirring head rotation speed of 750 r / min, a processing speed of 80 mm / min, and a stirring head tilt angle of 2°. The post-weld heat treatment temperature is 450 °C and the holding time is 1.5 h.

[0031] Step 3: Grind the welded plate into a smooth surface with sandpaper, and cold-roll the ground plate. The cold-rolling process parameters are a deformation per pass of 10% and a total deformation of 90%.

[0032] Example 3 The specific process flow of the method for producing wide-width and large-coil-weight titanium bronze alloy strips with low cost in this example is as follows: Step 1: Heat the forged titanium bronze alloy slab to 850 °C and hold for 10 min. Immediately after taking it out of the furnace, roll the forged titanium bronze alloy slab, and the rolling deformation is 40%.

[0033] Step 2: After the hot-rolled titanium bronze alloy plate is cooled, butt-join two plates perpendicular to the rolling direction and fix them on the welding table. Weld them with the parameters of a stirring head rotation speed of 900 r / min, a processing speed of 80 mm / min, and a stirring head tilt angle of 2°. The post-weld heat treatment temperature is 450 °C and the holding time is 1.5 h.

[0034] Step 3: Grind the welded plate into a smooth surface with sandpaper, and cold-roll the ground plate. The cold-rolling process parameters are a deformation per pass of 10% and a total deformation of 90%.

[0035] Example 4 The specific process flow of the method for producing wide-width and large-coil-weight titanium bronze alloy strips with low cost in this example is as follows: Step 1: Heat the forged titanium bronze alloy slab to 850 °C and hold for 10 min. Immediately after taking it out of the furnace, roll the forged titanium bronze alloy slab, and the rolling deformation is 40%.

[0036] Step 2: After the hot-rolled titanium bronze alloy plate is cooled, butt-join two plates perpendicular to the rolling direction and fix them on the welding table. Weld them with the parameters of a stirring head rotation speed of 1100 r / min, a processing speed of 100 mm / min, and a stirring head tilt angle of 2°. The post-weld heat treatment temperature is 450 °C and the holding time is 1.5 h.

[0037] Step 3: Grind the welded plate into a smooth surface with sandpaper, and cold-roll the ground plate. The cold-rolling process parameters are a deformation per pass of 10% and a total deformation of 90%.

[0038] Example 5 The specific process flow of the method for low-cost production of wide-width and large-roll-weight titanium bronze alloy strips in this embodiment is as follows: Step 1: Heat the forged titanium bronze alloy slab to 850°C and hold for 10 minutes. Immediately after taking it out of the furnace, roll the forged titanium bronze alloy slab, and the rolling deformation amount is 40%.

[0039] Step 2: After the hot-rolled titanium bronze alloy plate cools, butt two plates perpendicular to the rolling direction and fix them on the welding table. Weld them with the parameters of a stirring head rotation speed of 1200 r / min, a processing speed of 100 mm / min, and a stirring head inclination angle of 2°. The post-weld heat treatment temperature is 450°C, and the holding time is 1.5 h.

[0040] Step 3: Use sandpaper to polish the welded plate into a smooth surface, and cold-roll the polished plate. The cold-rolling process parameters are that the deformation amount per pass is 10%, and the total deformation amount is 90%.

[0041] Example 6 The specific process flow of the method for low-cost production of wide-width and large-roll-weight titanium bronze alloy strips in this embodiment is as follows: Step 1: Heat the forged titanium bronze alloy slab to 850°C and hold for 10 minutes. Immediately after taking it out of the furnace, roll the forged titanium bronze alloy slab, and the rolling deformation amount is 40%.

[0042] Step 2: After the hot-rolled titanium bronze alloy plate cools, butt two plates parallel to the rolling direction and fix them on the welding table. Weld them with the parameters of a stirring head rotation speed of 750 r / min, a processing speed of 80 mm / min, and a stirring head inclination angle of 2°. The post-weld heat treatment temperature is 450°C, and the holding time is 1.5 h.

[0043] Step 3: Use sandpaper to polish the welded plate into a smooth surface, and cold-roll the polished plate. The cold-rolling process parameters are that the deformation amount per pass is 10%, and the total deformation amount is 90%.

[0044] Example 7 The specific process flow of the method for low-cost production of wide-width and large-roll-weight titanium bronze alloy strips in this embodiment is as follows: Step 1: Heat the forged titanium bronze alloy slab to 850°C and hold for 10 minutes. Immediately after taking it out of the furnace, roll the forged titanium bronze alloy slab, and the rolling deformation amount is 40%.

[0045] Step 2: After the hot-rolled titanium bronze alloy plate cools, butt two plates perpendicular to the rolling direction and fix them on the welding table. Weld them with the parameters of a stirring head rotation speed of 750 r / min, a processing speed of 80 mm / min, and a stirring head inclination angle of 2°. The post-weld heat treatment temperature is 450°C, and the holding time is 1.5 h.

[0046] Step 3: Polish the welded sheet into a smooth surface with sandpaper, and then cold roll the polished sheet. The cold rolling process parameters are that the deformation per pass is 10% and the total deformation is 80%.

[0047] Example 8 The specific process flow of the method for producing wide-width and large coil weight titanium bronze alloy strips at low cost in this example is as follows: Step 1: Heat the forged titanium bronze alloy slab to 850 °C and hold for 10 min. Immediately after taking it out of the furnace, roll the forged titanium bronze alloy slab. The rolling deformation is 40%.

[0048] Step 2: After the hot-rolled titanium bronze alloy sheet cools, drill holes and add powder to two sheets. The diameter of the blind holes drilled is 1.5 mm, the depth is 1 mm, the hole pitch is 6 mm, the distance from the hole center to the sheet edge is 1.5 mm, and pure iron powder is added. Vertically align the two sheets with the rolling direction and fix them on the welding table. Weld them with the parameters of the stirring head rotation speed of 750 r / min, the processing speed of 80 mm / min, and the stirring head tilt angle of 2°. The post-weld heat treatment temperature is 450 °C and the holding time is 1.5 h.

[0049] Step 3: Polish the welded sheet into a smooth surface with sandpaper, and then cold roll the polished sheet. The cold rolling process parameters are that the deformation per pass is 10% and the total deformation is 80%.

[0050] Comparative Example 1 The specific process flow of this comparative example is as follows: Step 1: Heat the forged titanium bronze alloy slab to 850 °C and hold for 10 min. Immediately after taking it out of the furnace, roll the forged titanium bronze alloy slab. The rolling deformation is 40%.

[0051] Step 2: After the hot-rolled titanium bronze alloy sheet cools, perform arc fusion welding on two vertically fixed sheets.

[0052] Step 3: Polish the welded sheet into a smooth surface with sandpaper, and then cold roll the polished sheet. The cold rolling process parameters are that the deformation per pass is 10% and the total deformation is 90%.

[0053] Comparative Example 2 The specific process flow of this comparative example is as follows: Step 1: Heat the forged titanium bronze alloy slab to 850 °C and hold for 10 min. Immediately after taking it out of the furnace, roll the forged titanium bronze alloy slab. The rolling deformation is 40%.

[0054] Step 2: Wait for the hot-rolled titanium bronze alloy sheet to cool.

[0055] Step 3: Use sandpaper to polish the welded plate into a smooth surface, and then cold-roll the polished plate. The cold-rolling process parameters are that the deformation per pass is 10% and the total deformation is 90%.

[0056] Sample the materials obtained in Step 2 of each example and comparative example, and conduct tensile strength tests.

[0057] Tensile strength: The room temperature tensile test is carried out on an electronic universal mechanical property testing machine in accordance with "GB / T 228.1 2010 Metallic materials - Tensile testing - Part 1: Method of test at room temperature".

[0058] The technical solution of the present invention is described in detail through 8 examples and 2 comparative examples. Table 1 shows the process parameters and tensile strengths of each example and comparative example.

[0059] Table 1

[0060] The test results in Table 1 show that the welding efficiency of the welding process in the present invention can reach 80% - 85%, and the strength is reliable, which can be used as a connection process for increasing the coil weight of titanium bronze. From the above results, it can be determined that the present invention uses friction stir welding technology to achieve wide-width and large-coil-weight of titanium bronze alloy strips, and ensures that the welded joints do not break during subsequent continuous production, providing a process and method for the large-scale production of this new type of copper alloy, titanium bronze.

[0061] Figure 5 This is the microstructure diagram of the hot-rolled state in Step 1 of Example 1 of the present invention, that is, the microstructure before welding. Figure 6 This is the microstructure diagram after welding in Step 2 of Example 1 of the present invention. The comparison of the two figures shows that recrystallization occurs during the friction stir welding process. The recrystallized grains are equiaxed and fine, and its microstructure is excellent. Figure 7 This is the macroscopic diagram of cold rolling in Example 1 of the present invention. No fracture occurs in the sample during the rolling deformation process, and the welded sample can be cold-rolled smoothly.

[0062] Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or make equivalent substitutions, and any modification or equivalent substitution without departing from the spirit and scope of the present invention shall be covered by the scope of the present invention.

Claims

1. A method for producing wide and heavy titanium bronze alloy strip at low cost, characterized in that: The process includes the following: Butt-join and fix one side of the first hot-rolled titanium bronze alloy plate with one side of the second hot-rolled titanium bronze alloy plate; The first hot-rolled titanium bronze alloy plate and the second hot-rolled titanium bronze alloy plate are welded at the butt joint by means of stir friction welding, and then the weld is subjected to stress relief annealing; The above process is repeated to weld a number of hot-rolled titanium bronze alloy plates into an integral structure, and then cold-rolled to obtain titanium bronze alloy strips.

2. A method for producing wide width and heavy weight titanium bronze alloy strip at low cost according to claim 1, characterized in that: It also includes the following processes: At the edge of the side where the first hot-rolled titanium bronze alloy plate and the second hot-rolled titanium bronze alloy plate need to be butted, a plurality of blind holes (6) are provided at intervals along the length direction of the side, wherein the blind holes (6) are filled with iron powder, and then the butt joint is welded by stir friction welding.

3. A method for producing wide width and heavy weight titanium bronze alloy strip at low cost according to claim 2, characterized in that: The diameter of the blind hole is 1-1.5 mm, the depth is 0.5-1 mm, the hole spacing is 4-6 mm, and the distance from the hole center to the plate edge is 1.5-2 mm.

4. The method for producing wide width and heavy weight titanium bronze alloy strip at low cost according to claim 1, characterized in that: When friction stir welding is used for welding at the butt joint, the diameter of the stirring needle used is 1.5 to 3 mm.

5. The method for producing wide width and heavy weight titanium bronze alloy strip at low cost according to claim 1, characterized in that: When friction stir welding is used for welding at the butt joint, the rotation speed of the stirring head is 750-1200 r / min, the processing speed is 80-100 mm / min, the inclination angle of the stirring head is 1.5°-2.5°, and the inclination angle of the stirring head is the angle between the axis of the stirring head and the vertical line of the first hot-rolled titanium-bronze alloy plate. The first hot-rolled titanium-bronze alloy plate and the second hot-rolled titanium-bronze alloy plate are arranged parallel and coplanar.

6. The method for producing wide width and heavy weight titanium bronze alloy strip at low cost according to claim 1, characterized in that: When stress relief annealing is performed on the weld, the annealing holding temperature is 440~460℃, and the holding time is 1.5~2.0h.

7. The method for producing wide width and heavy weight titanium bronze alloy strip at low cost according to claim 1, characterized in that: During cold rolling, the deformation of each pass is 8%~12%, and the total deformation is 80%~90%.

8. The method for producing wide width and heavy weight titanium bronze alloy strip at low cost according to claim 1, characterized in that: In terms of mass percentage, the compositions of the first hot-rolled titanium bronze alloy plate and the second hot-rolled titanium bronze alloy plate are: Ti: 3%~4.5%, the rest is Cu.

9. The method for producing wide width and heavy weight titanium bronze alloy strip at low cost according to claim 1, characterized in that: The processing technology of the first hot-rolled titanium bronze alloy plate and the second hot-rolled titanium bronze alloy plate is as follows: The forged titanium bronze alloy slab is heated to a starting rolling temperature of 800-900°C, and then hot rolled. The final rolling temperature is controlled at 590-610°C, and the deformation is controlled at 38%-42%.

10. A titanium bronze alloy strip, characterized in that: The titanium bronze alloy strip is obtained by processing according to any one of claims 1 to 9.

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