A method for preparing a consumable electrode of Ti-1300F titanium alloy

Abstract

The application relates to the field of titanium alloy smelting, and discloses a preparation method of a Ti-1300F titanium alloy consumable electrode, which comprises the following steps: step 1, Ti and alloy elements are proportioned and uniformly mixed, and an electrode block with an arc-shaped cross section is obtained through pressing; wherein the alloy elements comprise Al, V, Fe, Cr and Mo; the weight percentage of Ti and each alloy element is as follows: the weight percentage of Al is 3.5%-5%, the weight percentage of V is 2.5%-4%, the weight percentage of Fe is 0.6%-1.5%, the weight percentage of Cr is 4.5%-6%, the weight percentage of Mo is 4%-6%, and the balance is Ti; step 2, the electrode blocks are stacked into a cylinder, and a consumable electrode is obtained through welding. The electrode block obtained by the application has good compactness, is free of porosity and virtual angle, and the electrode blocks are in close contact during stacking; the porosity and virtual angle phenomenon can be effectively inhibited, and the strength of the consumable electrode is improved; through welding at different speeds in different regions of the welding seam, the depths of the welding spot molten pools are consistent, the welding seam is free of spatter, and the strength of the consumable electrode is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of titanium alloy smelting, in particular to a preparation method of Ti-1300F titanium alloy consumable electrode. BACKGROUND

[0002] Ti-1300F titanium alloy is a new type of Ti-Al-Mo-V-Cr-Fe metastable beta type high-strength and high-toughness titanium alloy. Ti-1300F titanium alloy uses many types of intermediate alloy, and the particle sizes of the sponge titanium and various intermediate alloys are different, and the plasticities are different. The electrode block is difficult to form, the prepared electrode block is loose, the surface has cracks and virtual horns, and the strength of the consumable electrode is not enough.

[0003] When the VAR method is used to smelt large-size Ti-1300F titanium alloy, the strength of the consumable electrode cannot withstand the influence of the self-weight and the smelting lifting vibration, the un-melted electrode block will directly fall off, the dropping block phenomenon occurs, the composition uniformity of the Ti-1300F titanium alloy material is poor, and even inclusions appear, which affects the use performance; secondly, it may cause edge arc, leading to the breakdown of the crucible into water, and after reaching a certain condition, hydrogen explosion occurs, the furnace body is damaged, and even the workshop is destroyed, and serious safety accidents occur. Thirdly, in the welding process of the Ti-1300F titanium alloy consumable electrode, the high-activity titanium will react violently with oxygen, hydrogen, nitrogen and other gases at high temperature, and the unreasonable selection of the welding speed will cause the quality problems such as spatter and depression of the weld, and reduce the overall strength of the Ti-1300F titanium alloy consumable electrode. SUMMARY

[0004] In view of the problems in the prior art, the purpose of the present application is to provide a preparation method of Ti-1300F titanium alloy consumable electrode, which solves the problems of low strength and low safety of the existing Ti-1300F titanium alloy consumable electrode.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme.

[0006] A preparation method of Ti-1300F titanium alloy consumable electrode, comprising the following steps:

[0007] Step 1, blending and mixing Ti and alloying elements uniformly, and pressing to obtain an electrode block with an arc-shaped cross section;

[0008] Among them, the alloying elements include Al, V, Fe, Cr and Mo; the weight percentage of Ti and each alloying element: Al is 3.5% to 5%, V is 2.5% to 4%, Fe is 0.6% to 1.5%, Cr is 4.5% to 6%, Mo is 4% to 6%, and the balance is Ti;

[0009] Step 2, stacking the electrode blocks into a cylinder, and welding to obtain a consumable electrode.

[0010] Preferably, in step 1, Ti is added in the form of titanium sponge, iron-titanium alloy TiFe32 and titanium dioxide, V is added in the form of aluminum-vanadium alloy AlV85, Fe is added in the form of iron-titanium alloy TiFe32, Mo is added in the form of aluminum-molybdenum alloy AlMo60, Al is added in the form of aluminum-vanadium alloy AlV85, aluminum-molybdenum alloy AlMo60 and aluminum bean, and Cr is added in the form of metallic chromium.

[0011] Further preferably, in step 1, the particle size of titanium sponge is 5-12.7 mm, the particle size of aluminum-vanadium alloy is 0.25-6.3 mm, the particle size of aluminum bean is 5-11 mm, the particle size of iron-titanium alloy is 1-6 mm, the particle size of metallic chromium is 0.25-3 mm, the particle size of aluminum-molybdenum alloy is ≤0.8 mm, and the particle size of titanium dioxide is ≤45 μm.

[0012] Preferably, in step 1, the arc surface of the electrode block is semicircular, the diameter of the electrode block is 300-350 mm, and the height of the electrode block is 150-175 mm.

[0013] Preferably, in step 1, the pressing pressure is 3000-4000 mpa, and the pressure holding time is 10-15 s.

[0014] Preferably, in step 2, the weight of the consumable electrode is 1000-2000 kg.

[0015] Preferably, in step 2, the welding is vacuum plasma welding, and argon is filled in the vacuum plasma welding box before welding.

[0016] Further preferably, in step 2, the welding current is 550-600 A.

[0017] Further preferably, in step 2, the pressure of argon is 20000-30000 Pa.

[0018] Further preferably, in step 2, the welding speed of the first third of each welding length is 45-55 mm / min, the welding speed of the middle third is 70-80 mm / min, and the welding speed of the last third is 90-110 mm / min.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application can obtain an electrode block with good density, no loose and no virtual angle by pressing the titanium sponge with suitable particle size and the intermediate alloy, and the electrode blocks are in close contact when being stacked.

[0021] By setting the diameter and height of the electrode block and the semicircular cross section, the loose and virtual angle phenomenon can be effectively inhibited, and the strength of the consumable electrode is improved.

[0022] By setting a reasonable pressure range and pressure holding time, the electrode block density can be improved, and the loose and hollow corner phenomenon can be inhibited.

[0023] By welding different regions of the weld at different speeds, the weld pool depth of the welding point is consistent, which promotes the weld to have no spatter and the end part of the welding to have no pit; the overall strength of the consumable electrode is increased, so that the dropping phenomenon does not occur during the melting process, and safety problems are avoided.

[0024] By reasonably limiting the weight of the electrode, it is ensured that the consumable electrode will not break due to excessive weight. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only for illustration of the present application and should not be regarded as limiting the scope of the present application.

[0026] Example 1

[0027] Step 1: Ti and alloying elements are mixed and uniformly mixed, and an oil press is used to press to obtain an electrode block with a semicircular cross section.

[0028] The particle size and usage amount of Ti and alloying elements are shown in Table 1.

[0029] Table 1 Particle size and usage amount of Ti and alloying elements in Example 1

[0030] Raw material type Particle size Use amount / kg Titanium sponge 5-12.7mm 1385.2 Aluminum vanadium alloy AlV85 0.25-6.3mm 80 Aluminum bean 5-11mm 10 Iron titanium alloy TiFe32 1-6mm 80 Metallic chromium 0.25-3mm 91 Aluminum molybdenum alloy AlMo60 ≤0.8mm 120 Titanium dioxide ≤45μm 1.8

[0031] The particle sizes of the sponge titanium and the raw materials containing alloying elements are different, and by matching different particle sizes, the density of the pressed electrode block is improved, the porosity is reduced, and the density of the electrode block is improved. V element is added in the form of vanadium-aluminum alloy AlV85, the gas content of vanadium-aluminum alloy AlV85 is low, and the impurities such as Fe, Si, C and B meet the requirements of titanium alloy; Mo element is added in the form of aluminum-molybdenum alloy AlMo60, which makes the melted titanium alloy have smaller composition segregation and smaller burning loss, which is helpful to the homogenization of alloy composition.

[0032] The cross section of the pressed electrode block is semicircular, the diameter of the electrode block is 350mm, and the height is 170mm. The average pressing pressure is 3000mpa, and the pressure holding time is 15s. A total of 50 electrode blocks are pressed, and the weight of a single electrode block is 35kg.

[0033] Step 2: The electrode blocks are stacked into a cylinder with a length of 4750mm, and the total weight is 1750kg. After stacking, the electrode blocks are vacuum plasma welded by a vacuum plasma welding box.

[0034] The vacuum plasma welding chamber is filled with argon to a pressure of 30000 Pa before welding, the welding current is 600 A, and the welding voltage is 70 V. Under the above conditions, a good welding effect can be achieved. The vacuum plasma welding chamber has three welding guns, and the welding length of each welding gun is 1583 mm. The welding speed is 45 mm / min in the range of 0-525 mm, 80 mm / min in the range of 525-1050 mm, and 110 mm / min in the range of 1050-1583 mm. The average depth of the weld pool is 5 mm, and there is no spatter and no pit at the end of the welding process. The welding obtains a consumable electrode with a weight of 1750 kg.

[0035] Example 2

[0036] In step 1, Ti and alloying elements are mixed and uniformly mixed, and an oil press is used to press an electrode block with a semi-circular cross section.

[0037] The particle size and usage amount of Ti and alloying elements are shown in Table 2.

[0038] Table 2 Particle size and usage amount of Ti and alloying elements in Example 2

[0039] Raw material type Particle size Use amount / kg Titanium sponge 5-12.7mm 943.8 Aluminum vanadium alloy AlV85 0.25-6.3mm 39 Aluminum bean 5-11mm 8 Iron titanium alloy TiFe32 1-6mm 26 Metallic chromium 0.25-3mm 70 Aluminum molybdenum alloy AlMo60 ≤0.8mm 108 Titanium dioxide ≤45μm 2.9

[0040] The particle size of the sponge titanium and the raw material containing the alloying elements is different, and by matching the particle sizes of different sizes, the density of the pressed electrode block is improved, the porosity is reduced, and the density of the electrode block is improved. V element is added in the form of vanadium-aluminum alloy AlV85, the gas content of vanadium-aluminum alloy AlV85 is low, and the impurities such as Fe, Si, C and B meet the requirements of titanium alloy. Mo element is added in the form of aluminum-molybdenum alloy AlMo60, which makes the melted titanium alloy have smaller composition segregation and smaller burning loss, which is helpful to the homogenization of alloy composition.

[0041] The electrode block obtained by pressing has a semi-circular cross section, and the diameter of the electrode block is 300 mm and the height is 150 mm. The average pressing pressure is 4000 mpa, and the holding time is 10 s. A total of 50 electrode blocks are pressed, and the weight of a single electrode block is 23.7 kg.

[0042] In step 2, the electrode blocks are stacked into a cylinder with a length of 3750 mm, and then the electrode blocks are vacuum plasma welded by a vacuum plasma welding chamber.

[0043] The vacuum plasma welding chamber is filled with argon to a pressure of 30000 Pa before welding, the welding current is 600 A, and the welding voltage is 70 V. Under the above conditions, a good welding effect can be achieved. The vacuum plasma welding chamber has three welding guns, and the welding length of each welding gun is 1583 mm. The welding speed is 45 mm / min in the range of 0-525 mm, 80 mm / min in the range of 525-1050 mm, and 110 mm / min in the range of 1050-1583 mm. The average depth of the weld pool is 5 mm, and there is no spatter and no pit at the end of the welding process. The welding obtains a consumable electrode with a weight of 1750 kg.

[0044] The vacuum plasma welding box has three welding torches, and the welding length of each welding torch is 1250 mm. The welding speed is 55 mm / min in the range of 0-416 mm, 70 mm / min in the range of 416-832 mm, and 90 mm / min in the range of 832-1250 mm. The average depth of the welding pool reaches 5 mm, and there is no spatter and pit in the end part during the welding process; after the welding is completed, the consumable electrode is obtained, and the weight is 1185 kg.

[0045] The density of the pressed electrode block of the Ti-1300F titanium alloy consumable electrode prepared in Example 1 reaches 3.50 g / mm 3 -3.65 g / mm 3 The density of the pressed electrode block of the Ti-1300F titanium alloy consumable electrode prepared in Example 2 reaches 3.55 g / mm 3 -3.70 g / mm 3 , and the density of the existing consumable electrode block is 3.30 g / mm 3 -3.50 g / mm 3 The density of the pressed electrode block of Example 1 and Example 2 is obviously higher than that of the existing consumable electrode block, and the loose and virtual angle phenomenon of the electrode block is greatly reduced. The strength of the electrode block is positively correlated with the density, and the higher the density of the electrode block, the higher the strength. The overall strength of the consumable electrode obtained by vacuum plasma welding of the electrode blocks pressed in Example 1 and Example 2 is high, and there is no fracture and block dropping phenomenon in the melting process.

[0046] In Example 1 and Example 2 of the present application, different welding speeds are used for different regions of the welding seam, the depth of the welding pool is consistent, there is no spatter and pit in the end part during the welding process, and the strength of the consumable electrode is further improved.

[0047] Although the present application has been described in detail in the specification and specific embodiments, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application, all belong to the scope of protection required by the present application.

Claims

1. A method for preparing a Ti-1300F titanium alloy consumable electrode, characterized in that, Includes the following steps: Step 1: Prepare and mix Ti and alloying elements evenly, and press them to obtain an electrode block with an arc-shaped cross-section; Specifically, the arc surface of the electrode block is semi-circular, the diameter of the electrode block is 300-350mm, the height is 150-175mm, and the density of the electrode block after pressing is 3.50-3.70g / mm³. The alloying elements include Al, V, Fe, Cr and Mo; the weight percentage of Ti and each alloying element is as follows: Al 3.5%–5%, V 2.5%–4%, Fe 0.6%–1.5%, Cr 4.5%–6%, Mo 4%–6%, with the balance being Ti. Step 2: Stack the electrode blocks into cylinders and weld them together to obtain consumable electrodes; Specifically, the welding is vacuum plasma welding. Before welding, argon gas is filled into the vacuum plasma welding box. The welding current is 550-600A, the pressure of the argon gas is 20000-30000Pa, the welding speed of the first third of each welding length is 45-55mm / min, the welding speed of the middle third is 70-80mm / min, and the welding speed of the last third is 90-110mm / min.

2. The method for preparing the Ti-1300F titanium alloy consumable electrode according to claim 1, characterized in that, In step 1, Ti is added in the form of sponge titanium, iron-titanium alloy TiFe32 and titanium dioxide, V is added in the form of aluminum-vanadium alloy AlV85, Fe is added in the form of iron-titanium alloy TiFe32, Mo is added in the form of aluminum-molybdenum alloy AlMo60, Al is added in the form of aluminum-vanadium alloy AlV85, aluminum-molybdenum alloy AlMo60 and aluminum briquettes, and Cr is added in the form of metallic chromium.

3. The method for preparing the Ti-1300F titanium alloy consumable electrode according to claim 2, characterized in that, In step 1, the particle size of the sponge titanium is 5-12.7 mm, the particle size of the aluminum-vanadium alloy is 0.25-6.3 mm, the particle size of the aluminum granules is 5-11 mm, the particle size of the iron-titanium alloy is 1-6 mm, the particle size of the metallic chromium is 0.25-3 mm, the particle size of the aluminum-molybdenum alloy is ≤0.8 mm, and the particle size of titanium dioxide is ≤45 μm.

4. The method for preparing the Ti-1300F titanium alloy consumable electrode according to claim 1, characterized in that, In step 1, the pressing pressure is 3000-4000 MPa, and the holding time is 10-15 seconds.

5. The method for preparing the Ti-1300F titanium alloy consumable electrode according to claim 1, characterized in that, The weight of the consumable electrode in step 2 is 1000-2000 kg.