A method for recycling titanium and zirconium alloy auxiliary electrodes for vacuum consumable smelting

Abstract

The present invention belongs to the technical field of nonferrous metal material processing, and specifically relates to a method for recycling titanium and zirconium alloy auxiliary electrodes used in vacuum consumable smelting. The method comprises the following steps: sawing the ends of multiple auxiliary electrodes of the same brand and similar diameter; machining the surfaces and end faces of the sawn auxiliary electrodes to smooth them; sequentially turning external threads and internal threaded holes on the machined auxiliary electrodes; connecting the threaded auxiliary electrodes end to end in ascending order of diameter, tightening the threads, and batching them into 1×N complete auxiliary electrodes; transferring the batched auxiliary electrodes to a vacuum plasma welding box for further welding and reinforcement; and cleaning the surfaces and end faces of the auxiliary electrodes after cooling after welding before returning them to smelting production. The present invention recycles and reuses discarded auxiliary electrodes through a "mechanical thread assembly + vacuum plasma welding" method, improving the quality of electrode connections and being simpler, safer, and more economical.

Description

Technical Field

[0001] The invention belongs to the technical field of nonferrous metal material processing, and in particular relates to a method for recycling titanium and zirconium alloy auxiliary electrodes used for vacuum consumable smelting. Background Art

[0002] In the vacuum consumable melting of titanium or zirconium alloys, the auxiliary electrode is an important component connecting the electrode rod and the consumable electrode. It mainly plays the role of protecting the electrode rod and ensuring the quality of the smelted product. After the new auxiliary electrode is officially put into production, it will gradually be consumed as the number of melting increases. For the sake of melting safety, when the auxiliary electrode is consumed to a length of about 300mm, it needs to be replaced with a new auxiliary electrode before subsequent melting. The replaced auxiliary electrode is either purified and then used as return material, or directly scrapped. This will cause a great waste of resources and energy in the long run.

[0003] On the other hand, in the actual smelting production of titanium and zirconium alloys, if the reserve of auxiliary electrodes is insufficient and smelting is to be continued, the auxiliary electrodes must be remade according to the traditional "electrode preparation + smelting + forging" method. The processing cycle is very long, and this process will not only consume a lot of manpower, financial resources, and material resources, but will also seriously affect the production progress and interrupt the continuity of titanium and zirconium alloy smelting production.

[0004] The current existing method for recycling waste auxiliary electrodes of titanium and zirconium alloys mainly adopts the method of in-furnace welding to connect the waste auxiliary electrodes. Although this method can improve the utilization rate of waste auxiliary electrodes to a certain extent, it also faces the problems of difficulty and high risk of in-furnace welding operation and high energy consumption. In addition, the auxiliary electrodes produced by this method are also at risk of falling off during the subsequent smelting process due to insufficient strength of the welding joint surface, which affects the smelting quality and cannot meet the requirements of high-quality production of vacuum consumable smelting of titanium and zirconium alloys. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention innovatively proposes a method for recycling titanium and zirconium alloy auxiliary electrodes used in vacuum consumable melting. This recycling method improves the bonding strength between the electrodes, while also reducing operational difficulty, improving safety, and reducing energy consumption. This method makes recycling discarded auxiliary electrodes simpler, safer, and more economical, meeting the needs of titanium and zirconium alloy vacuum consumable melting production.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for recycling titanium and zirconium alloy auxiliary electrodes used for vacuum consumable melting comprises the following steps:

[0008] Step S1, selecting N discarded auxiliary electrodes of the same brand and similar diameter;

[0009] Step S2, sawing off the head and tail ends of the auxiliary electrodes, wherein only the tail of the auxiliary electrode with the smallest diameter is sawed off;

[0010] Step S3, machining the sawn auxiliary electrode surface and end face to smoothen them, remove impurities including molten metal, volatiles and dirt, and set them aside for use after machining;

[0011] Step S4: turning external threads and internal thread holes at both ends of the head and tail of the machined multiple auxiliary electrodes in sequence, wherein the auxiliary electrode with the smallest diameter only turns the internal thread hole at the tail, and the auxiliary electrode with the largest diameter only turns the external thread at the head;

[0012] Step S5: Connect the multiple auxiliary electrodes with threaded parts end to end in ascending order of diameter, tighten the threads, and place them on the electrode stacking platform to form a batch of 1×N complete auxiliary electrodes;

[0013] Step S6: Clamp the assembled auxiliary electrodes with a fixture and place them in a vacuum plasma welding box for further welding reinforcement. The auxiliary electrodes are sequentially subjected to the processes of evacuation, argon filling, welding, cooling, evacuation, and breaking in the welding box before being taken out of the furnace.

[0014] Step S7: remove the welded auxiliary electrode from the fixture and place it on the electrode storage platform for cooling;

[0015] Step S8: Clean the surface and end face of the cooled auxiliary electrode and put it into formal production.

[0016] Furthermore, in step S1, the number of the discarded auxiliary electrodes is 2≤N<8, the diameter of the discarded auxiliary electrodes is 250-500 mm, and the diameter difference between different electrodes is ≤10 mm.

[0017] Furthermore, in step S2 , the cutting slope of the plurality of discarded auxiliary electrodes that have been sawn is less than 2 mm.

[0018] Furthermore, the plurality of machined discarded auxiliary electrodes in step S3 must meet the following conditions: the diameter difference between different electrodes is ≤10 mm, the electrode length is greater than 200 mm, and the electrode surface roughness Ra is less than 12.7 μm.

[0019] Furthermore, in step S4, the diameter, length, and pitch of the external thread and the internal thread hole should be the same, the diameter of the external thread and / or internal thread hole = (1 / 4-1 / 3) * the diameter of the auxiliary electrode with the smallest diameter; the length of the external thread and / or internal thread hole = 30-50 mm; the pitch of the external thread and / or internal thread hole = 3-5 mm.

[0020] Furthermore, the spacing between the auxiliary electrodes tightened in step S5 is less than 1 mm.

[0021] Furthermore, the welding method in step S6 is specifically as follows: turn on the vacuum pump in the vacuum plasma welding box, and start leak detection when the vacuum degree is evacuated to below 5Pa; when the leak rate is met ≤0.93Pa / min, turn off the vacuum pump and start filling with argon; fill the argon pressure to 20-30kPa and start arcing: arcing height 5-15mm, arcing argon flow rate 20-40L / min, arcing current 400-550A; after successful arcing, start welding: welding height 80-150mm, welding argon flow rate 20-40L / min, welding current 400-550A, welding uses spot welding, and welds the middle seam of the electrode from head to tail in sequence, with a weld spot diameter of >30mm and a weld spot depth of >10mm; after welding, let it stand in the furnace to cool, and the cooling time is >2h; after the cooling time is reached, turn on the vacuum pump and start evacuating, and open the exhaust valve to break the air when it is evacuated below 10Pa; when the vacuum in the furnace rises to atmospheric pressure, take it out of the furnace.

[0022] Furthermore, the auxiliary electrode welded in step S7 is cooled to a temperature below 50° C. on the storage platform.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The method for recycling discarded auxiliary electrodes of the present invention adopts the method of "mechanical thread assembly + vacuum plasma welding" to recycle discarded auxiliary electrodes of the same brand. It does not require furnace butt welding, multiple smelting, forging, and polishing, which greatly reduces the operation difficulty, improves the operation safety, reduces energy consumption, and has a better electrode connection effect. It can better ensure the safety of subsequent smelting and the quality of ingot products, and overcomes the defects of traditional auxiliary electrode recycling and reuse methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a process flow chart of the auxiliary electrode recycling and reuse process of the present invention.

[0027] Figure 2 This is a schematic structural diagram of the assembled auxiliary electrode according to Example 1 of the present invention.

[0028] Explanation of the reference numerals: 1-1# electrode; 2-2# electrode; 3-3# electrode; 4-4# electrode; 5-thread; 6-welding point. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] Example 1

[0031] A method for recycling waste auxiliary electrodes used in vacuum consumable melting of TA15 titanium alloy, such as Figure 1 As shown, the following steps are included:

[0032] Step S1, selecting four TA15 discarded auxiliary electrodes with diameters of 300 mm, 302 mm, 306 mm, and 308 mm, and lengths of 350 mm, 350 mm, 400 mm, and 450 mm, respectively;

[0033] The discarded TA15 auxiliary electrode with a diameter of 300 mm and a length of 350 mm is recorded as 1# electrode, the discarded TA15 auxiliary electrode with a diameter of 302 mm and a length of 350 mm is recorded as 2# electrode, the discarded TA15 auxiliary electrode with a diameter of 306 mm and a length of 400 mm is recorded as 3# electrode, and the discarded TA15 auxiliary electrode with a diameter of 308 mm and a length of 450 mm is recorded as 4# electrode;

[0034] Step S2: saw off the auxiliary electrode at both ends in sequence, removing the threads and the clamping head at the head and the weld bead at the tail. After sawing, the cutting angle must be less than 2 mm. For the auxiliary electrode with a diameter of 300 mm (electrode #1), only the tail is sawn off.

[0035] Step S3: The surface and end surface of the remaining portion of the discarded auxiliary electrode are smoothed using a lathe to remove any molten material, spatter, and dirt. The surface roughness of the electrodes after machining is Ra < 12.7 μm. The electrode diameters are 295 mm (1# electrode), 297 mm (2# electrode), 301 mm (3# electrode), and 303 mm (4# electrode). The lengths are 300 mm (1# electrode), 250 mm (2# electrode), 300 mm (3# electrode), and 350 mm (4# electrode). The total length of the electrodes is 1200 mm.

[0036] Step S4: Turn the ends of the auxiliary electrodes into external threads and internal threaded holes. The diameter, length, and pitch of the external threads and the threaded holes are the same: external thread diameter d1 = internal threaded hole diameter d2 = 80 mm, external thread length L1 = internal threaded hole length L2 = 30 mm, and external thread pitch l1 = internal threaded hole pitch l2 = 3 mm. The auxiliary electrode with a diameter of 295 mm (electrode #1) has only the internal threaded hole turned at the tail end, while the auxiliary electrode with a diameter of 303 mm (electrode #4) has only the external threads turned at the head end.

[0037] Step S5: Connect the four auxiliary electrodes with threaded parts in ascending order of diameter (295mm, 297mm, 301mm, 303mm), tighten the threads in sequence, and place them on the electrode stacking platform to form a batch of 1×4 complete electrodes. The spacing between the tightened auxiliary electrodes is less than 1mm. Figure 2 As shown;

[0038] Step S6, clamping the assembled auxiliary electrode with a fixture and placing it in a vacuum plasma welding box for welding, turning on the vacuum pump to evacuate the vacuum degree in the welding box to below 5Pa and start leak detection, when the leak rate meets ≤0.93Pa / min, turning off the vacuum pump and starting argon filling; filling the argon pressure to 20kPa and starting the arc; arc starting height 12mm, arc starting argon flow 32L / min, arc starting current 400A; after successful arc starting, start welding: welding height 100mm, welding argon flow 26L / min, welding current 510A, welding using spot welding, welding 3 middle seams of the electrode in sequence along the longitudinal direction, 6 points in each seam, one every 60°, a total of 18 points, welding point diameter >30mm, welding point depth >10mm; after welding, let it stand in the furnace to cool; after the cooling time reaches 2.5h, start turning on the vacuum pump to evacuate the air, and open the exhaust valve to break the air when the vacuum in the furnace rises to atmospheric pressure;

[0039] Step S7: Remove the welded auxiliary electrode from the fixture and place it on the electrode storage platform to cool for more than 8 hours until the surface temperature drops below 50°C;

[0040] Step S8: Clean the surface and end face of the cooled auxiliary electrode. The cleaned auxiliary electrode can be put into use. This auxiliary electrode can be used for vacuum consumable melting to produce TA15 titanium alloy ingots with a diameter in the range of Ф600mm-Ф650mm.

[0041] Example 2

[0042] A method for recycling discarded auxiliary electrodes used in vacuum consumable melting of TC11 titanium alloy comprises the following steps:

[0043] Step S1: Select five TC11 discarded auxiliary electrodes with diameters of 350 mm, 352 mm, 354 mm, 356 mm, and 358 mm, and lengths of 320 mm, 320 mm, 380 mm, 380 mm, and 400 mm, respectively;

[0044] The discarded TA15 auxiliary electrode with a diameter of 350 mm and a length of 320 mm is recorded as 1# electrode, the discarded TA15 auxiliary electrode with a diameter of 352 mm and a length of 320 mm is recorded as 2# electrode, the discarded TA15 auxiliary electrode with a diameter of 354 mm and a length of 380 mm is recorded as 3# electrode, the discarded TA15 auxiliary electrode with a diameter of 356 mm and a length of 380 mm is recorded as 4# electrode, and the discarded TA15 auxiliary electrode with a diameter of 358 mm and a length of 400 mm is recorded as 5# electrode;

[0045] Step S2: sawing the auxiliary electrode at both ends in sequence, removing the threads and the clamping head at the head, and removing the weld bead at the tail. After sawing, the cutting slope must be less than 2 mm. For the auxiliary electrode with a diameter of 350 mm (electrode 1), only the tail is sawed.

[0046] Step S3: The surface and end surface of the remaining portion of the discarded auxiliary electrode are smoothed using a lathe to remove any molten material, spatter, and dirt. The surface roughness of the electrodes after machining is Ra < 12.7 μm. The electrode diameters are 345 mm (1# electrode), 347 mm (2# electrode), 349 mm (3# electrode), 351 mm (4# electrode), and 353 mm (5# electrode). The lengths are 270 mm (1# electrode), 220 mm (2# electrode), 280 mm (3# electrode), 280 mm (4# electrode), and 300 mm (5# electrode). The total length of the electrodes is 1350 mm.

[0047] Step S4: Turn the end of the auxiliary electrode into an external thread and an internal thread hole in sequence. The diameter, length, and pitch of the external thread and the internal thread hole are the same: the external thread diameter d1 = the internal thread hole diameter d2 = 100 mm, the external thread length L1 = the internal thread hole length L2 = 50 mm, and the external thread pitch l1 = the internal thread hole pitch l2 = 5 mm. The auxiliary electrode with a diameter of 345 mm (electrode #1) has only the internal thread hole turned at the tail end, and the auxiliary electrode with a diameter of 353 mm (electrode #5) has only the external thread turned at the head end.

[0048] Step S5: Connect the five threaded auxiliary electrodes in ascending order of diameter (345 mm, 347 mm, 349 mm, 351 mm, 353 mm) end to end, tighten the threads in sequence, and place them on the electrode stacking platform to form a batch of 1×5 complete electrodes. The spacing between the tightened auxiliary electrodes is less than 1 mm.

[0049] Step S6, clamping the assembled auxiliary electrode with a fixture and placing it in a vacuum plasma welding box for welding, turning on the vacuum pump to evacuate the vacuum degree in the welding box to below 5Pa and start leak detection, when the leak rate meets ≤0.93Pa / min, turning off the vacuum pump and starting argon filling; filling the argon pressure to 20kPa and starting the arc; arc starting height 8mm, arc starting argon flow 35L / min, arc starting current 400A; after successful arc starting, start welding: welding height 130mm, welding argon flow 23L / min, welding current 480A, welding using spot welding, welding 4 middle seams of the electrode in sequence along the longitudinal direction, 6 points in each seam, one every 60°, a total of 24 points, welding point diameter >30mm, welding point depth >10mm; after welding, let it stand in the furnace to cool; after the cooling time reaches 2.5h, start turning on the vacuum pump to evacuate the air, and open the exhaust valve to break the air when the vacuum in the furnace rises to atmospheric pressure;

[0050] Step S7: Remove the welded auxiliary electrode from the fixture and place it on the electrode storage platform to cool for more than 8 hours until the surface temperature drops below 50°C;

[0051] Step S8: Clean the surface and end face of the cooled auxiliary electrode. The cleaned auxiliary electrode can be put into use. This auxiliary electrode can be used for vacuum consumable melting to produce TC11 titanium alloy ingots with a diameter in the range of 700 mm to 750 mm.

[0052] Example 3

[0053] A method for recycling discarded auxiliary electrodes used for vacuum consumable melting of TC18 titanium alloy comprises the following steps:

[0054] Step S1, selecting 6 TC11 discarded auxiliary electrodes with diameters of 400 mm, 402 mm, 404 mm, 406 mm, 408 mm, and 410 mm, and lengths of 300 mm, 320 mm, 330 mm, 370 mm, 380 mm, and 400 mm, respectively;

[0055] The discarded TA15 auxiliary electrode with a diameter of 400mm and a length of 300mm is recorded as 1# electrode, the discarded TA15 auxiliary electrode with a diameter of 402mm and a length of 320mm is recorded as 2# electrode, the discarded TA15 auxiliary electrode with a diameter of 404mm and a length of 330mm is recorded as 3# electrode, the discarded TA15 auxiliary electrode with a diameter of 406mm and a length of 370mm is recorded as 4# electrode, the discarded TA15 auxiliary electrode with a diameter of 408mm and a length of 380mm is recorded as 5# electrode, and the discarded TA15 auxiliary electrode with a diameter of 410mm and a length of 400mm is recorded as 6# electrode;

[0056] Step S2: saw off the auxiliary electrode at both ends in sequence, removing the threads and the clamping head at the head and the weld bead at the tail. After sawing, the cutting angle must be less than 2 mm. For the auxiliary electrode with a diameter of 400 mm (electrode #1), only the tail is sawn off.

[0057] Step S3: The surface and end surface of the remaining portion of the discarded auxiliary electrode are smoothed by lathe to remove the molten nodules, spatter, and dirt thereon. The surface roughness of the electrode after machining is Ra <12.7 μm. The electrode diameters are 395 mm (1# electrode), 397 mm (2# electrode), 399 mm (3# electrode), 401 mm (4# electrode), 403 mm (5# electrode), and 405 mm (6# electrode). The lengths are 250 mm (1# electrode), 220 mm (2# electrode), 230 mm (3# electrode), 270 mm (4# electrode), 280 mm (5# electrode), and 300 mm (6# electrode). The total length of the electrode is 1550 mm.

[0058] Step S4: Turn the ends of the auxiliary electrodes to form external threads and internal threaded holes. The diameter, length, and pitch of the external threads and internal threaded holes are identical: external thread diameter d1 = internal threaded hole diameter d2 = 120 mm, external thread length L1 = internal threaded hole length L2 = 40 mm, and external thread pitch l1 = internal threaded hole pitch l2 = 4 mm. The auxiliary electrode with a diameter of 395 mm (electrode #1) has only the internal threaded hole turned at the tail end, while the auxiliary electrode with a diameter of 405 mm (electrode #6) has only the external threads turned at the head end.

[0059] Step S5: Connect the six auxiliary electrodes with threaded parts in ascending order of diameter (395mm, 397mm, 399mm, 401mm, 403mm, 405mm), tighten the threads in sequence, and place them on the electrode stacking platform to form a batch of 1×6 complete electrodes. The spacing between the tightened auxiliary electrodes is less than 1mm.

[0060] Step S6, clamping the assembled auxiliary electrode with a fixture and placing it in a vacuum plasma welding box for welding, turning on the vacuum pump to evacuate the vacuum degree in the welding box to below 5Pa and start leak detection, when the leak rate meets ≤0.93Pa / min, turning off the vacuum pump and starting argon filling; filling the argon pressure to 20kPa and starting the arc; arc starting height 10mm, arc starting argon flow 30L / min, arc starting current 400A; after successful arc starting, start welding: welding height 120mm, welding argon flow 25L / min, welding current 500A, welding using spot welding, welding 5 middle seams of the electrode in sequence along the longitudinal direction, 6 points in each seam, one every 60°, a total of 30 points, welding point diameter >30mm, welding point depth >10mm; after welding, let it stand in the furnace to cool; after the cooling time reaches 2.5h, start turning on the vacuum pump to evacuate the vacuum, evacuate to below 10Pa, open the exhaust valve to break the air; when the vacuum in the furnace rises to atmospheric pressure, take it out of the furnace;

[0061] Step S7: Remove the welded auxiliary electrode from the fixture and place it on the electrode storage platform to cool for more than 8 hours until the surface temperature drops below 50°C;

[0062] Step S8: Clean the surface and end face of the cooled auxiliary electrode. The cleaned auxiliary electrode can be put into use. This auxiliary electrode can be used for vacuum consumable melting to produce TC18 titanium alloy ingots with a diameter in the range of Ф800mm-Ф850mm.

[0063] In summary, the method for recycling auxiliary electrodes for vacuum consumable smelting of titanium and zirconium alloys provided by the present invention can recycle and reuse auxiliary electrodes of the same brand and similar diameter that are discarded because their length is shorter than the safety distance (generally stipulated as 300 mm). The auxiliary electrodes are mainly tightly connected by mechanical thread assembly, and the auxiliary electrodes are further welded and reinforced by vacuum plasma welding. This method of recycling and reusing auxiliary electrodes can overcome the defects of traditional methods. The electrode blocks are more tightly combined, and the operation is simpler, safer, and less costly during recycling, which can meet the requirements of today's high-quality vacuum consumable smelting of titanium and zirconium alloys.

[0064] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for recycling titanium and zirconium alloy auxiliary electrodes for vacuum consumable melting, characterized in that: The following steps are involved: Step S1, selecting N discarded auxiliary electrodes of the same brand and similar diameter; Step S2, sawing off the head and tail ends of the auxiliary electrodes, wherein only the tail of the auxiliary electrode with the smallest diameter is sawed off; Step S3, machining the sawn auxiliary electrode surface and end face to smoothen them, remove impurities including molten metal, volatiles and dirt, and set them aside for use after machining; Step S4: turning external threads and internal thread holes at both ends of the head and tail of the machined multiple auxiliary electrodes in sequence, wherein the auxiliary electrode with the smallest diameter only turns the internal thread hole at the tail, and the auxiliary electrode with the largest diameter only turns the external thread at the head; Step S5: Connect the multiple auxiliary electrodes with threaded parts end to end in ascending order of diameter, tighten the threads, and place them on the electrode stacking platform to form a batch of 1×N complete auxiliary electrodes; Step S6: Clamp the assembled auxiliary electrodes with a fixture and place them in a vacuum plasma welding box for further welding reinforcement. The auxiliary electrodes are sequentially subjected to the processes of evacuation, argon filling, welding, cooling, evacuation, and breaking in the welding box before being taken out of the furnace. Step S7: remove the welded auxiliary electrode from the fixture and place it on the electrode storage platform for cooling; Step S8: Clean the surface and end face of the cooled auxiliary electrode and put it into formal production; In step S3, the multiple machined discarded auxiliary electrodes must meet the following conditions: the diameter difference between different electrodes is ≤10 mm, the electrode length is greater than 200 mm, and the electrode surface roughness Ra is less than 12.7 μm; The welding method in step S6 is specifically as follows: turn on the vacuum pump in the vacuum plasma welding box, and start leak detection when the vacuum degree is evacuated to below 5Pa; when the leak rate is ≤0.93Pa / min, turn off the vacuum pump and start filling with argon; fill the argon pressure to 20-30kPa and start arcing: arcing height 5-15mm, arcing argon flow rate 20-40L / min, arcing current 400-550A; after successful arcing, start welding: welding height 80-150mm, welding argon flow rate 20-40L / min, welding current 400-550A, welding is carried out in the form of spot welding, and the middle seam of the electrode is welded from the head to the tail in sequence, the weld spot diameter is greater than 30mm, and the weld spot depth is greater than 10mm; after welding, let it stand in the furnace to cool, and the cooling time is greater than 2h; after the cooling time is reached, turn on the vacuum pump and start evacuating, and open the exhaust valve to break the air when the vacuum in the furnace is evacuated to below 10Pa; when the vacuum in the furnace rises to atmospheric pressure, take it out of the furnace.

2. The method for recycling titanium and zirconium alloy auxiliary electrodes for vacuum consumable melting according to claim 1, characterized in that: In step S1, the number of the discarded auxiliary electrodes is 2≤N<8, the diameter of the discarded auxiliary electrodes is 250-500 mm, and the diameter difference between different electrodes is ≤10 mm.

3. The method for recycling titanium and zirconium alloy auxiliary electrodes for vacuum consumable melting according to claim 1, characterized in that: In step S2 , the cutting angle of the plurality of sawn discarded auxiliary electrodes is less than 2 mm.

4. The method for recycling titanium and zirconium alloy auxiliary electrodes for vacuum consumable melting according to claim 1, characterized in that: In step S4, the diameter, length, and pitch of the external thread and internal thread hole should be the same: the diameter of the external thread and / or internal thread hole = (1 / 4-1 / 3) * the diameter of the auxiliary electrode with the smallest diameter; the length of the external thread and / or internal thread hole = 30-50 mm; and the pitch of the external thread and / or internal thread hole = 3-5 mm.

5. The method for recycling titanium and zirconium alloy auxiliary electrodes for vacuum consumable melting according to claim 1, characterized in that: The distance between the auxiliary electrodes tightened in step S5 is less than 1 mm.

6. The method for recycling titanium and zirconium alloy auxiliary electrodes for vacuum consumable melting according to claim 1, characterized in that: In step S7, the auxiliary electrode welded is cooled to a temperature below 50° C. on the storage platform.

Images