JPS6046333A - Preparation of ingot forming consumption electrode comprising high melting point active metal - Google Patents

Abstract

PURPOSE:To fabricate an electrode free from distortion within a short time, by temporarily forming an electrode having a core rod at the center thereof by subjecting stacked compacts each comprising a high m.p. active metal to spot welding, and tightening the same by using the core rod as a shaft to perform main welding before pulling off the core rod. CONSTITUTION:For example, a plurality of fan shaped compacts 12 each comprising a powdery, granular, fragmentary or sponge like high m.p. active metal such as Ti, Zr, Ta, Mo or W are arranged on an assembling table so as to mutually contact the flat surfaces thereof and two rows thereof are inlaid with an assembling frame 2 and fixed by tightening the same in a traverse direction by screws 3 and in a longitudinal direction by screws 4 through backplates 15. In the next step, a core rod 7 is placed to a longitudinal groove part so as to be coincided with the groove thereof and temporarily welded so as to form welding spots 5 to temporarily form an electrode 14 having the core rod 7 at the center part thereof. Succeedingly, a jack 11 with a tightening handle 10 is attached to the core rod 7 and the electrode 4 and a stub 8 are tightened in a long axis direction and main spot welding 5 are performed before the core rod 7 is pulled off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the use of titanium, zirconium, tankle, molybdenum, tungsten, etc. J1 point rl
'i I/U-treated metal or its alloy, etc. in a bath 1Q1
This article relates to a method of manufacturing a sushi electrode used in festivals.

When melting high-melting point activated metals, are those metals consumed? An arc melting method is usually used in which the L electrode is water-cooled and the vacuum melting force ivC is concentrated, and an arc is generated between the tip of the electrode and the other electrode (bath water) to completely melt the electrode metal.

This consumable electrode for melting (hereinafter referred to as an electrode) is generally a compact compact made by compression molding a high melting point activated metal in the form of powder, granules, flakes, or nubonge-like q- into a circular, semicircular, or fan-shaped plate. A large number of electrodes are assembled into a cylindrical shape and welded, and a stub (a jig for suspending the electrode in the bath IW furnace) is welded to one end to form an electrode that can be suspended. In order to prevent distortion of the compacts and to improve surface contact between the compacts 1 and 1, it is necessary to weld the stacked compacts in a tightened state. If distortion occurs and the electrode is bent, an arc discharge will occur between the crucible side wall of the water-cooled vacuum melting furnace and the 9th part of the polarization curve, completely damaging the water-cooled crucible, and causing the coolant to flow into the furnace. The water will rise by 7 dl due to the high heat, and the decomposed hydrogen gas may explode, causing major or minor damage. Furthermore, if there is no surface contact between the compacts, problems such as instability of the arc (unstable melting operation) will occur.

Conventionally, when manufacturing electrodes, for example, a large number of quarter-disk-shaped compacts were stacked and arranged in two rows on an assembly table, and semi-cylindrical compacts were moved in the longitudinal direction using hydraulic screws. and 1J direction, and in this state, for example, use an argon seal, Buchsma arc welding, and bead weld the inner surface (-1lll'u) of compact cylinder 1 in the longitudinal direction to join. -ru. The other semi-cylindrical compact I-4 manufactured in the same manner was combined with the above-mentioned semi-cylindrical compact group to form a cylindrical shape, and the longitudinal and 1] direction swords and compact R1 were again tightened using hydraulic jacks. ] Ke, the combination I'' in the same way as Be F
Join by f8 contact. Next, a stub is brought into contact with one end of the group of cylindrical compacts and tightened from the longitudinal direction with a hydraulic jack. has been generally used.The above ′′ after welding
To avoid deformation of the electrode, large-scale hydraulic screws were always used during welding, and bead welding was used extensively for welding VrC.

However, because this conventional method uses spot welding, it takes a long time to manufacture the electrodes. , I was disappointed.

In view of the above-mentioned drawbacks of the conventional method, the object of the present invention is to partially replace bead welding with spot welding, and to provide a method by which an electrode without distortion can be manufactured in a short time by combining bead welding and spot welding. δ was lost.

That is, the invention is to form an electrode having a core frame in the center by overlapping compacts of high-melting point activated metals and spot welding (temporary welding), and then completely open the core frame to form the electrode into a plate. After attaching the VC in the axial direction and inserting a stub into one end of the electrode which is bead welded or formed into a plate in this state, both of the TIi: extremely welded stubs are tightened in the same manner to perform bead welding. By compressing high melting point activated metals such as titanium, zirconium, tantalum, molybdenum, tungnuten, etc. in the form of powder, wafer-like, no-1-like, and nubonji-like shapes into circular, semicircular, or fan-shaped plates. The required number of molded compacts are lined up and fixed, and an electrode with a core frame in the center is formed by temporary welding, and if necessary, a stub is inserted into one end of the electrode and screwed in the axial direction. = 11 popularity in a single digit state, in a vacuum or inert atmosphere, the compact group' or the compact group and the decisive piece j9 of the stub: After welding with bead bath welding, the core frame is removed.゛1G melting point activation The gist is the manufacturing method of [Consumable power for melting of 1-co-1-metal]j.

Hereinafter, the method of the present invention will be briefly explained in detail based on Examples. H394π51. shown in FIG. r25 dragon, W
Using a 2301 m quarter-disk pure titanium consumable 1-(1), a consumable 711 for pure titanium melting was produced by an uninvented method.
I made one pole. That is, as shown in FIGS. 2 and 3, 18 compacts of the above shape are arranged on an assembly table with their planes touching each other, and the two rows of awns are fitted into the assembly frame (2), and the Plate (screw (3) VCL through the restraint "1" direction, 17t screw (4) vC, J: ') length"
Tighten it in the f direction to fix the frame 1'J VC in a compact 1' circle (.), and perform temporary welding at the east meeting point of the outer and inner surfaces of the group 1 according to (5).After this, , loosen the screws (3) and (4) and remove the Konbaku!・side from the assembly frame. Turn the inside of the Konbaku 1 group (2) temporarily welded into the semi-cylindrical shape upwards, and remove the inside of the inside. A core frame (7) that matches the groove is placed in a vertical groove (6) with a groove width of 50 mm, which is cut out in the shape of J.A screw groove is cut on both ends of the core frame. Then, superimpose the other compact hammered metal formed into a semi-cylindrical shape using the above method on top of it, and make contact at all points at each seam to form a circular columnar body. Step 9: A plate is formed with a core frame (7) in the center.

Alternatively, the electrode can be formed into a plate using the following procedure. That is, the above-mentioned method VCJ: After a group of 71' circularly welded combs 1 are stacked on top of each other, a core frame (7) is inserted into the through hole formed to form an electrode having a core frame. Board formation sui or reed. 7 Combine four compacts (1) in Figure 1 and make a circle with a through hole by spot welding vC, arrange them in the longitudinal direction to form a cylinder plate, and insert a core frame ( 7) may be inserted to form an electrode having a core frame in the center.

After tightening the electrode with a core frame at the center of the plate formed by the above method VC via the core frame, Temporarily weld the circular seams using spot welding. next,
Tighten in the longitudinal direction through the core frame passed through the center, and do not weld the 1-ji (the necessary parts of the core (contact 1-open seam) with the #j weld without welding), and then Remove the frame.If you also connect the stud to the electrode at the same time,
As shown in FIG. 4, a nub (8) having a through hole with an inner diameter of 50 mm in the center is fully inserted into one end of the core frame (7). Fix the presser washer (9) to the stud side mandrel frame, and tighten the electrode side mandrel l/c. Tighten the entire stud firmly with jacks in the long axis direction, and temporarily spot weld the joint between the electrode and the nub.

Next, with the core frame in the state of 7jt\, turn the wire 1i'1
: Required areas on both sides of the stub (the gap between the compacts and the gap between the compact 1 and the nukufu 1)
] Pregnant bead welding (X bath contact at 13, r after finishing this bath 4
Obtain the electrode by attaching the rrt core rod to the core frame.
m contact U, large SC middle argon seal temple)' Sozma arc is sufficient for vCm contact. Alcon seal plasma arc welding is simple because it does not require large-scale equipment, but the inventors put the electrode with the core frame in a sealed container and placed it in an argon atmosphere to improve productivity. The bead was closely bonded. 8 in the axial direction as shown in Figure 4.
VC, perform four bead bath welding α3 in the circumferential direction, and while cooling, take out the electrode with the core frame from the airtight container and remove the jack, core frame, and presser washer.
A stamped electrode was manufactured that could be used for manufacturing.

By these methods, it is possible to easily produce a consumable electrode for titanium melting with no distortion and good contact between compacts.

As mentioned above, the compact bath junction vc, L is;+
'71゜When manufacturing consumable electrodes for melting of excitation point activated metals, the conventional method is to use a large-scale hydraulic jack to hold the compact group longitudinally and It is tightened in the width direction (=J), and temporary welding is only used in 7i. By using a core frame inserted through the VC and C, you can easily and evenly tighten the VC (=J) by continuing only in the long axis direction.Moreover, the joining of the studs and the joining of the compact IiT can be done by simultaneous welding. Consumable electrodes with no deviation or distortion can be easily manufactured.The method of the invention of kataki wood reduces the number of unwelded welds by replacing some of the main welding, which has poor workability, with temporary welding.
It is possible to improve work efficiency by reducing the total loss of joint strength.

Another advantage is that it is possible to perform wood welding while the compact or compact door is housed in a sealed container with screws fastened to the body.

[Brief explanation of the drawing]

Figure 1 shows an example of pure titanium comb 1-, and Y 1+
i Figure and side view [Fig. FIGS. 2 and 3 are a plan view and a side view showing one process of Fuinenhiriro. FIG. 4 is a side view showing a state in which a core body is inserted into a group of Combaku 1 and a Skuzo, and the VC is integrally tightened with a screw A' with a screw handle, during the process of the uninvented method. l: Compact, 22 assembly frame, 3.4: I/S, 5:
Point (temporary) welding, 6: Vertical groove, 7: Core frame, 8 Nistub, 9:
Presser washer, 10: Tightening screw handle, 1: glossy, 12: semi-cylindrical shape 1-■, 13: bead (un)bath contact, 14: electric wire, 15: patch plate applicant Osaka Titanium Manufacturing Co., Ltd.

Claims (1)

[Scope of Claims] (1) Powdered, granular, flaky, nubonzi-like ζri: titanium, zirconium, tantalum, molybdenum, tungsten, and other high melting point activated metals shaped into circular, semicircular, or I, iii
The required number of compression-molded compacts are lined up and fixed, and an electrode is formed in the center of υ by temporary welding, and the plate-formed electrode is tightened around the core frame. A method for producing a consumable electrode for melting a metal with a same point occupancy of t1, the method comprising the steps of main welding and removing the core frame after non-welding. (2) Titanium, zirconium, quantal, molybdenum, tungsten clear and high melting point activated metals in the form of powder, granules, flakes, nubonzi, etc. in circular or semicircular form? The necks of compacts compression-molded into 1' fan-shaped plates are lined up and fixed, an electrode with a core frame is formed in the center by temporary welding, and a stub is inserted into one end of the plate-formed electrode. 1□ characterized in that the electrode and the stub are tightened around the core frame as an axis, then X-welded, and the core frame is removed after the welding is completed;
A method for producing a consumable electrode for melting a 18I melting point/11 tempered metal. (3) Claims (1) In the method of (1) or (2), the center portion V formed into a plate by temporary welding has a core frame. Place the silkworms and stubs in an airtight container in a vacuum or in an inert atmosphere, seal them in the necessary places, and place them in an airtight container. Special feature 1il'l requesting range 111(i)t characterized in that after the welding is completed, the core frame is taken out from the airtight reactor and the core frame is completely removed.
or (21) the method for producing a consumable electrode for melting a high melting point activated metal.