Method for eliminating short circuit in smelting feeding stage of titanium alloy cast ingot

Abstract

The invention belongs to the technical field of titanium alloy cast ingot preparation, and particularly relates to a method for eliminating short circuit in a titanium alloy cast ingot smelting feeding stage, which specifically comprises the following steps of: on the premise of not applying a steady arc current, obtaining a head welding quality with a full, uniform and no-overflow welding pool by designing a low-current, low-voltage and long-time heat preservation stage and the like; and meanwhile, in the feeding process, the current decline rate and molten drop parameters when the current density is reduced to 0.01 A / mm < 2 >-0.015 A / mm < 2 > are monitored and controlled, and finally the large-specification titanium alloy cast ingot without short circuit abnormity in the feeding process is obtained. The problem that short circuit is prone to occurring in the smelting feeding stage of existing titanium alloy ingots with the specification of phi 820 mm to phi 1050 mm is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium alloy ingot preparation, and in particular relates to a method for eliminating short circuits in a titanium alloy ingot melting and shrinkage feeding stage. Background Art

[0002] In the industrial production of titanium alloys, a vacuum consumable arc furnace is usually used. After three smeltings, titanium alloy ingots are obtained. The finished product smelting process (i.e., the third smelting) can be divided into three stages: arc starting period, normal smelting period, and head shrinkage compensation period. The head shrinkage compensation period of the ingot usually adopts the process of "gradually reducing power + small current insulation". When the current drops to less than 1 / 3 of the current in the normal smelting period, it enters the small current insulation stage. Small current insulation can keep the surface of the molten pool in a molten state at all times, so that the molten metal continuously enters the molten pool to fill the volume shrinkage caused by solidification and crystallization, and gradually reduces the volume and depth of the molten pool from bottom to top, ensuring that the head molten pool, shrinkage holes, and looseness are minimized when the power is turned off at the end of smelting, reducing the weight of the riser and improving the yield.

[0003] Under the existing technology, short circuits are very likely to occur during the shrinkage feeding stage of titanium alloy ingots with specifications of Φ820mm~Φ1050mm, especially during the low current insulation stage. There are three reasons for this: (1) Under the existing technology, the welding parameters of the ingot head need to set a stabilizing arc current. For example, the authorization announcement number CN109702292B provides a welding process for a VAR titanium alloy ingot. The purpose of setting the stabilizing arc current is to ensure that the welding arc moves evenly on the welding surface, ensure that the end face is heated evenly, and constrain the welding molten pool to avoid overflow of the molten pool and cause welding defects. As for the head welding of large-sized ingots such as Φ820mm~Φ1050mm, due to the increase in ingot shape and electrode length, the head welding is often carried out outside the crucible. Not only does the area to be welded increase, but it is also impossible to apply a stable arc magnetic field to constrain the molten pool. Therefore, the molten pool is very likely to overflow during head welding, affecting the welding quality and easily causing uneven welding molten pool. As a result, after a long period of baking in the shrinking current stage, the auxiliary electrode and the electrode welding point are partially separated, causing one side of the molten residue remaining disk to droop or the entire circle to be in an umbrella-shaped contact with the molten pool, resulting in a short circuit. (2) For large-sized ingots of Φ820mm~Φ1050mm, conventional shrinking process routes are used. In the later baking stage of shrinking, it is more likely to cause a jagged morphology at the edge of the molten residue remaining disk, causing a short circuit, because the current density is usually reduced to 0.01A / mm 2 ~0.015A / mm 2During the "sawtooth" stage, the electrode end surface is prone to produce molten droplets adhering to the edge due to the baking effect of small current, and gradually solidifies to form a sawtooth morphology. Under the same process route, compared with small and medium-sized ingots, large-sized ingots are significantly longer in this stage during shrinkage compensation, and heat storage is obvious, which makes the "sawtooth" grow rapidly and elongate during this stage, contacting the molten pool and causing a short circuit; (3) Since the current surge and voltage drop during a short circuit often occur in an instant (milliseconds or seconds), it is difficult for existing equipment to monitor and take real-time response adjustments. Usually, the short circuit is relieved by manually lifting the electrode rod after the short circuit occurs.

[0004] At present, there is no effective method to eliminate the short circuit abnormality during the melting and shrinkage feeding stage of the finished titanium alloy ingots with specifications of Φ820mm~Φ1050mm. Once a short circuit occurs, it will seriously damage the continuity of the molten pool filling and the crystal structure, causing the shrinkage hole depth and riser of the ingot to be too large, reducing the yield rate; in severe cases, it will cause the ingot to solidify intermittently, affecting the uniformity of the composition. Therefore, it is very necessary to develop a method to eliminate the short circuit during the melting and shrinkage feeding stage of the finished titanium alloy ingots with specifications of Φ820mm~Φ1050mm. Summary of the invention

[0005] The purpose of the present invention is to provide a method for eliminating short circuit during the melting and shrinkage feeding stage of titanium alloy ingot finished products, aiming to solve the problem that short circuit is easy to occur during the melting and shrinkage feeding stage of existing titanium alloy ingot finished products with specifications of Φ820mm to Φ1050mm.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for eliminating short circuits during the shrinkage feeding stage of a titanium alloy ingot is used to prepare a titanium alloy ingot with a specification of Φ820 to Φ1050 mm, and specifically comprises the following steps:

[0008] S1. Prepare a consumable electrode, an auxiliary electrode and a crucible, assemble the consumable electrode in the crucible, place the crucible in a vacuum consumable arc furnace, install the auxiliary electrode on the pneumatic clamp of the electrode rod, seal the furnace and evacuate the furnace to prepare for welding;

[0009] S2. The auxiliary electrode and the consumable electrode are head-welded in a vacuum consumable arc furnace without applying an arc stabilizing current;

[0010] S3. The consumable electrode after welding is placed in the crucible and then sealed, vacuumed, and arc-melted; the melting current is 20A to 35A, and the melting voltage is 25V to 40V;

[0011] S4. When the unmelted weight of the consumable electrode is between 300 and 500 kg, the feeding process begins. The feeding process adopts the feeding method of "gradually reducing the current + small current insulation". In the process of gradually reducing the current, the control of the current reduction rate is subject to the following special requirements: When the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2 range, it is necessary to increase the descending rate; during the shrinkage feeding process, the droplet parameters are monitored. When the droplet value is greater than 10-15d / s, the electrode rod is automatically triggered to rise 5mm-10mm, and finally a titanium alloy ingot with a diameter of Φ820-Φ1050mm is obtained without short circuit during the shrinkage feeding process.

[0012] Preferably, during the S4 feeding process, the method for controlling the current drop rate is: when the current density is higher than 0.015A / mm 2 When the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2 When the current density is less than 0.01A / mm, the rate of decrease should be increased appropriately to ensure that the current decrease rate is between 0.6 and 1.0kA / min. 2 When the current decrease rate is less than 0.1kA / min.

[0013] Preferably, during the S4 shrinkage compensation process, the droplet parameters are monitored, and when the droplet value increases to 15d / s, the electrode rod is automatically triggered to lift 5mm to 10mm; if the droplet value drops below 15d / s, the electrode rod lifting action stops; if the droplet value does not decrease, the electrode rod continues to lift until the droplet value drops below 15d / s.

[0014] Preferably, in S2, when the auxiliary electrode and the consumable electrode perform head welding, they go through the arc starting stage, small current, low voltage, long-term insulation stage, molten pool exit stage and high current stage; the current, voltage and time parameters of each stage are set in sequence as follows: (2~6kA) / (20~25V) / (1~4min)→(4~7kA) / (22~26V) / (10~15min)→(5~10kA) / (24~27V) / (3~6min)→(8~20kA) / (26~30V) / (2~5min).

[0015] Preferably, in S1, the specification of the auxiliary electrode is Φ360 mm to Φ460 mm, the specification of the consumable electrode is Φ720 mm to Φ920 mm, and the specification of the crucible is Φ820 mm to Φ1050 mm.

[0016] Compared with traditional technology, the present invention can completely eliminate The short-circuit problem in the melting and shrinkage feeding stage of finished titanium alloy ingots is solved. Under the premise of not applying arc stabilizing current, the present invention obtains the head welding quality of full, uniform and no overflow of welding pool by designing small current, low voltage and long-time heat preservation stage. At the same time, in the shrinkage feeding process, the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2 The current drop rate and droplet parameters within the specified range are monitored and controlled, and ultimately a large-sized titanium alloy ingot is obtained without short-circuit anomalies in the shrinkage feeding process, which reduces the difficulty of the titanium alloy ingot melting and shrinkage feeding operation and further improves the ingot riser size and yield stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a top view of the welding morphology in the arc starting stage.

[0018] Figure 2 This is a top view of the outer edge of the welding end face during the low current, low voltage and long-term insulation stage.

[0019] Figure 3 This is a top view of the "sawtooth" morphology of the swept edge during the high current stage.

[0020] Figure 4 This is a top view of the morphology after welding is completed. DETAILED DESCRIPTION

[0021] The method for eliminating short circuit in the titanium alloy ingot melting and feeding stage of the present invention is used to prepare a titanium alloy ingot with a specification of Φ820 to Φ1050 mm, and specifically comprises the following steps:

[0022] S1. Prepare consumable electrode, auxiliary electrode and crucible, assemble the consumable electrode in the crucible, place the crucible in a vacuum consumable arc furnace, install the auxiliary electrode on the pneumatic clamp of the electrode rod, seal the furnace and evacuate the furnace to prepare for welding; the specifications of the auxiliary electrode are Φ360mm~Φ460mm, the specifications of the consumable electrode are Φ720mm~Φ920mm, and the specifications of the crucible are Φ820mm~Φ1050mm.

[0023] S2. The auxiliary electrode and the consumable electrode are head-welded in a vacuum consumable arc furnace. No arc stabilizing current is required during welding. The welding parameters refer to Table 1. Finally, a welding morphology with a full molten pool is obtained, achieving the effect of 1+1>2.

[0024] Table 1 Welding parameters of titanium alloy ingot head with diameter of Φ820~Φ1050mm

[0025]

[0026]

[0027] In the arc starting stage, the current is set to 2kA~6kA, the voltage is set to 20~25V, and the welding time is set to 1~4min. The purpose is to preheat the welding surface. Figure 1 As shown;

[0028] In the low current, low voltage and long-time heat preservation stage, the current is set to 4kA~7kA, the voltage is 22V~26V, and the welding time is 10min~15min. The purpose is to form a 20mm~30mm long sawtooth shape on the outer edge of the auxiliary electrode end through long-time heat preservation to restrain the overflow of the molten pool. Figure 2 As shown;

[0029] In the high current stage, the current is set to 8kA~20kA, the voltage is 26V~30V, and the welding time is 2min~5min. The purpose is to sweep the "sawtooth" on the outer edge of the auxiliary electrode end surface to the electrode end surface before short-circuit welding. On the one hand, it can ensure that the auxiliary electrode end surface is relatively flat during short-circuit welding; on the other hand, the swept circle of "sawtooth" can also form a "barrier" on the electrode end surface to prevent the molten pool from overflowing and ensure that the molten pool is full during welding. Figure 3 As shown;

[0030] Finally, when all the "saw teeth" that appear during the welding process are swept away and the entire molten pool is full, immediately press down the electrode rod to complete the short-circuit welding. After the welding is completed, the morphology is as follows: Figure 4 shown.

[0031] S3. The consumable electrode after welding is placed in the crucible and then sealed, vacuumed, and arc-melted; the melting current is 20A to 35A, and the melting voltage is 25V to 40V;

[0032] S4. When the unmelted weight of the consumable electrode is between 300 and 500 kg, the feeding process begins. The feeding process adopts the feeding method of "gradually reducing the current + small current insulation". In the process of gradually reducing the current, the control of the current reduction rate is subject to the following special requirements: When the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2 range, it is necessary to increase the descending rate to avoid the appearance of obvious long "sawtooth" morphology on the remaining end face of the electrode; during the shrinkage feeding process, the droplet parameters are monitored. When the droplet value is greater than 10-15d / s, the electrode rod is automatically triggered to rise 5mm-10mm to prevent short circuit. Finally, a titanium alloy ingot with a diameter of Φ820-Φ1050mm is obtained without short circuit during the shrinkage feeding process.

[0033] Specifically, the method for controlling the current drop rate is: when the current density is higher than 0.015A / mm 2 When the current density is reduced to 0.01A / mm 2~0.015A / mm 2 When the current density is less than 0.01A / mm, the rate of decrease should be increased appropriately to ensure that the current decrease rate is between 0.6 and 1.0kA / min. 2 When the current decrease rate is less than 0.1kA / min.

[0034] Specifically, the droplet parameters are monitored. When the droplet value increases to 15d / s, the electrode rod is automatically triggered to rise 5mm to 10mm. If the droplet value drops below 15d / s, the electrode rod lifting action stops. If the droplet value does not drop, the electrode rod continues to rise until the droplet value drops below 15d / s.

[0035] The embodiment of the present invention uses TC4 titanium alloy ingot for specific description.

[0036] Example 1

[0037] A method for eliminating short circuits during the feeding stage of TC4 titanium alloy ingot melting is used to prepare a TC4 titanium alloy ingot of Φ820 specification, and specifically comprises the following steps:

[0038] S1. Prepare a Φ720mm consumable electrode, a Φ360mm auxiliary electrode and a Φ820mm crucible, assemble the consumable electrode in the crucible, place the crucible in a vacuum consumable arc furnace, install the auxiliary electrode on the pneumatic clamp of the electrode rod, seal the furnace and evacuate the furnace to prepare for welding;

[0039] S2. Perform head welding of the auxiliary electrode and the consumable electrode in a vacuum consumable arc furnace. No arc stabilizing current is required during welding. Refer to Table 2 for welding parameters.

[0040] Table 2 Φ820 titanium alloy ingot head welding parameters

[0041] stage Current / kA Voltage / V Arc stabilization current / A Time / min Arc starting stage 2～4 20～23 0 1～2 Small current, low voltage, long time insulation stage 4～5 22～24 0 10～13 Out of the molten pool stage 5～8 24～25 0 3～4 High current stage 8～18 26～28 0 2～3

[0042] S3. The consumable electrode after welding is placed in the crucible and then sealed, vacuumed, and arc-melted; the melting current is 20A to 33A, and the melting voltage is 25V to 38V;

[0043] S4. When the unmelted weight of the consumable electrode is 300kg, the feeding process begins. The feeding process adopts the feeding method of "gradually reducing the current + small current insulation". In the process of gradually reducing the current, the control of the current reduction rate is subject to the following special requirements: When the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2When the droplet value is greater than 10-15d / s, the electrode rod is automatically triggered to rise 5mm-10mm to prevent short circuit. Finally, a titanium alloy ingot with a diameter of Φ820 is obtained without short circuit during the shrinkage feeding process.

[0044] Prepared by the above method The probability of abnormal short circuit during the repair of TC4 titanium alloy ingot is 0%, the fluctuation weight of the riser size between different furnaces is about 20kg, and the stability of the ingot riser size and yield rate is further improved.

[0045] Example 2

[0046] A method for eliminating short circuits during the feeding stage of TC4 titanium alloy ingot melting is used to prepare a TC4 titanium alloy ingot of Φ920 specification, and specifically comprises the following steps:

[0047] S1. Prepare Φ820mm consumable electrode, Φ410mm auxiliary electrode and Φ920mm crucible, assemble the consumable electrode in the crucible, place the crucible in a vacuum consumable arc furnace, install the auxiliary electrode on the pneumatic clamp of the electrode rod, seal the furnace and evacuate the furnace to prepare for welding;

[0048] S2. Perform head welding of the auxiliary electrode and the consumable electrode in a vacuum consumable arc furnace. No arc stabilizing current is required during welding. Refer to Table 3 for welding parameters.

[0049] Table 3 Φ920 titanium alloy ingot head welding parameters

[0050]

[0051]

[0052] S3. The consumable electrode after welding is placed in the crucible, the furnace is sealed, vacuumed, and arc melting is started; the melting current is 21A ~ 34A, and the melting voltage is 26V ~ 39V;

[0053] S4. When the unmelted weight of the consumable electrode is 400kg, the feeding process begins. The feeding process adopts the feeding method of "gradually reducing the current + small current insulation". In the process of gradually reducing the current, the control of the current reduction rate is subject to the following special requirements: When the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2range, it is necessary to increase the descending rate to avoid the appearance of obvious long "sawtooth" morphology on the remaining end face of the electrode; during the shrinkage feeding process, the droplet parameters are monitored. When the droplet value is greater than 10-15d / s, the electrode rod is automatically triggered to rise 5mm-10mm to prevent short circuit. Finally, a titanium alloy ingot with a diameter of Φ920 is obtained without short circuit during the shrinkage feeding process.

[0054] Prepared by the above method The probability of abnormal short circuit during the repair of TC4 titanium alloy ingot is 0%, the fluctuation weight of the riser size between different furnaces is about 20kg, and the stability of the ingot riser size and yield rate is further improved.

[0055] Example 3

[0056] A method for eliminating short circuits during the feeding stage of TC4 titanium alloy ingot melting is used to prepare a TC4 titanium alloy ingot of Φ1050 specification, and specifically comprises the following steps:

[0057] S1. Preparation Specifications Consumable Electrode, Specifications Auxiliary Electrode and Specification crucible, assemble the consumable electrode in the crucible, place the crucible in a vacuum consumable arc furnace, install the auxiliary electrode on the pneumatic clamp of the electrode rod, seal the furnace and evacuate the vacuum to prepare for welding in the furnace;

[0058] S2. Perform head welding of the auxiliary electrode and the consumable electrode in a vacuum consumable arc furnace. No arc stabilizing current is required during welding. Refer to Table 4 for welding parameters.

[0059] Table 4 Φ1050 titanium alloy ingot head welding parameters

[0060]

[0061]

[0062] S3. The consumable electrode after welding is placed in the crucible and then sealed, vacuumed, and arc-melted; the melting current is 22A ~ 35A, and the melting voltage is 27V ~ 40V;

[0063] S4. When the unmelted weight of the consumable electrode is 500kg, the feeding process begins. The feeding process adopts the feeding method of "gradually reducing the current + small current insulation". In the process of gradually reducing the current, the control of the current reduction rate is subject to the following special requirements: When the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2When the droplet value is greater than 10-15d / s, the electrode rod is automatically triggered to rise 5mm-10mm to prevent short circuit. Finally, a titanium alloy ingot with a diameter of Φ1050 is obtained without short circuit during the shrinkage feeding process.

[0064] The probability of abnormal short circuit in the preparation of Φ1050mm TC4 titanium alloy ingots by the above method is 0%, the fluctuation weight of the riser size between different furnaces is about 20kg, and the stability of the ingot riser size and yield rate is further improved.

[0065] Comparative Example

[0066] The preparation of TC4 titanium alloy ingot with a specification of Φ820 specifically includes the following steps:

[0067] S1. Prepare a Φ720mm consumable electrode, a Φ360mm auxiliary electrode and a Φ820mm crucible, assemble the consumable electrode in the crucible, place the crucible in a vacuum consumable arc furnace, install the auxiliary electrode on the pneumatic clamp of the electrode rod, seal the furnace and evacuate the furnace to prepare for welding;

[0068] S2. Perform head welding of the auxiliary electrode and the consumable electrode in a vacuum consumable arc furnace. No arc stabilizing current is required during welding. Refer to Table 5 for welding parameters.

[0069] Table 5 Φ820 titanium alloy ingot head welding parameters

[0070]

[0071]

[0072] During welding, gradually increase the current and voltage values ​​and observe the condition of the molten pool. When the entire molten pool is full or there is local overflow of the molten pool, you need to immediately press down the electrode rod to complete the short-circuit welding.

[0073] When welding under conventional technology, a small current, low voltage, and long-term insulation stage are not set. The end surface of the auxiliary electrode will not form an obvious long serrated morphology during welding, and the entire welding process basically maintains a flat morphology. In addition, when the head of a large-sized ingot is usually welded outside the crucible, a steady arc current cannot be applied to the molten pool, which can easily cause the molten pool to overflow.

[0074] S3. The consumable electrode after welding is placed in the crucible and then sealed, vacuumed, and arc-melted; the melting current is 20A to 33A, and the melting voltage is 25V to 38V;

[0075] S4. When the unmelted weight of the consumable electrode reaches 300kg, the feeding process begins. The feeding process adopts the feeding method of "gradually reducing the current + small current insulation". In the process of gradually reducing the current, the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2 There is no special control requirement for the current drop rate within the range; during the shrinkage process, conventional parameters such as current, voltage and vacuum are monitored and controlled, and the droplet parameters are not monitored. If a short circuit occurs during the process, the electrode rod is manually lifted to eliminate the short circuit.

[0076] Prepared by the above method The probability of abnormal short circuit during the repair of TC4 titanium alloy ingot is 10%, the fluctuation weight of the riser size between different furnaces is about 50kg, and the stability of the ingot riser size and yield rate is relatively poor.

[0077] In summary, compared with the traditional technology, the present invention can completely eliminate In order to solve the short-circuit problem in the melting and shrinkage feeding stage of finished titanium alloy ingots, the welding pool is full, uniform and has no overflow head welding quality by designing small current, low voltage and long-term heat preservation stage without applying arc stabilization current. At the same time, during the shrinkage feeding process, the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2 The current drop rate and droplet parameters within the specified range are monitored and controlled, and ultimately a large-sized titanium alloy ingot is obtained without short-circuit anomalies in the shrinkage feeding process, which reduces the difficulty of the titanium alloy ingot melting and shrinkage feeding operation and further improves the ingot riser size and yield stability.

Claims

1. A method for eliminating short circuits during the feeding stage of titanium alloy ingot melting, characterized in that: The method is used to prepare titanium alloy ingots with a specification of Φ820 to Φ1050 mm, and specifically comprises the following steps: S1. Prepare a consumable electrode, an auxiliary electrode and a crucible, assemble the consumable electrode in the crucible, place the crucible in a vacuum consumable arc furnace, install the auxiliary electrode on the pneumatic clamp of the electrode rod, seal the furnace and evacuate the furnace to prepare for welding; S2. The auxiliary electrode and the consumable electrode are head-welded in a vacuum consumable arc furnace without applying an arc stabilizing current; S3. The consumable electrode after welding is placed in the crucible and then sealed, vacuumed, and arc-melted; the melting current is 20A to 35A, and the melting voltage is 25V to 40V; S4. When the unmelted weight of the consumable electrode is between 300 and 500 kg, the feeding process begins. The feeding process adopts the feeding method of "gradually reducing the current + small current insulation". In the process of gradually reducing the current, the control of the current reduction rate is subject to the following special requirements: When the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2 range, it is necessary to increase the descending rate; during the shrinkage feeding process, the droplet parameters are monitored. When the droplet value is greater than 10-15d / s, the electrode rod is automatically triggered to rise 5mm-10mm, and finally a titanium alloy ingot with a diameter of Φ820-Φ1050mm is obtained without short circuit during the shrinkage feeding process.

2. The method for eliminating short circuit in the titanium alloy ingot melting and feeding stage according to claim 1, characterized in that: During the S4 feeding process, the method for controlling the current drop rate is: when the current density is higher than 0.015A / mm 2 When the current density is reduced to 0.01A / mm 2 ~0.015A / mm 2 When the current density is less than 0.01A / mm, the rate of decrease needs to be increased to ensure that the current decrease rate is between 0.6 and 1.0kA / min. 2 When the current decrease rate is less than 0.1kA / min.

3. The method for eliminating short circuit in the titanium alloy ingot melting and feeding stage according to claim 1, characterized in that: During the S4 shrinkage compensation process, the droplet parameters are monitored. When the droplet value increases to 15d / s, the electrode rod is automatically triggered to lift 5mm to 10mm; if the droplet value drops below 15d / s, the electrode rod lifting action stops; if the droplet value does not decrease, the electrode rod continues to lift until the droplet value drops below 15d / s.

4. The method for eliminating short circuit in the titanium alloy ingot melting and feeding stage according to claim 1, characterized in that: In S2, when the auxiliary electrode and the consumable electrode are head-welded, they go through the arc starting stage, low current, low voltage, long-term heat preservation stage, molten pool exit stage and high current stage; the current, voltage and time parameters of each stage are set in sequence as follows: (2-6kA) / (20-25V) / (1-4min)→(4-7kA) / (22-26V) / (10-15min)→(5-10kA) / (24-27V) / (3-6min)→(8-20kA) / (26-30V) / (2-5min).

5. The method for eliminating short circuit in the titanium alloy ingot melting and feeding stage according to claim 1, characterized in that: In S1, the specification of the auxiliary electrode is Φ360mm-Φ460mm, the specification of the consumable electrode is Φ720mm-Φ920mm, and the specification of the crucible is Φ820mm-Φ1050mm.

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