CN113601059A - Method for improving welding strength by enlarging remelting ingot casting welding surface - Google Patents
Method for improving welding strength by enlarging remelting ingot casting welding surface Download PDFInfo
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- CN113601059A CN113601059A CN202110823959.5A CN202110823959A CN113601059A CN 113601059 A CN113601059 A CN 113601059A CN 202110823959 A CN202110823959 A CN 202110823959A CN 113601059 A CN113601059 A CN 113601059A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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Abstract
The invention discloses a method for improving welding strength by increasing a remelting ingot casting welding surface, which specifically comprises the following steps: 1) arranging a crucible bottom pad for primary smelting; 2) setting another ingot to be remelted; 3) and assembling and welding. The method is characterized in that a crucible bottom pad is designed into a circular truncated cone step structure with a concave outer ring edge and a convex inner ring, the bottom edge of a produced primary cast ingot is convex, the cast ingot with the convex edge is arranged at the lower part before remelting, one end of another cast ingot to be remelted is arranged at the upper part after chamfering, the edge bulge of the cast ingot to be welded at the lower part is matched with the edge chamfer of the cast ingot at the upper part to form a welding surface with a gap, and finally the two parts are assembled and welded into a whole in a consumable arc furnace. The method of the invention increases the welding area of the upper and lower cast ingots, and prevents the metal solution from flowing down from the outer circle of the cast ingot to be welded at the lower part during welding, thereby obviously improving the welding strength and avoiding unsafe accidents caused by infirm welding due to insufficient welding area.
Description
Technical Field
The invention belongs to the technical field of titanium alloy ingot casting smelting, and particularly relates to a method for improving welding strength by enlarging a remelting ingot casting welding surface in a vacuum consumable arc furnace.
Background
The most common mode for producing titanium alloy ingots is a vacuum consumable arc melting mode, and the process generally comprises the following four stages: firstly, uniformly mixing raw materials (sponge titanium and intermediate alloy) by using a mixer; secondly, pressing electrode blocks by using an oil press, and assembling and welding the electrode blocks to obtain a primary consumable electrode; then smelting the mixture by using a vacuum consumable electrode electric arc furnace to obtain a primary cast ingot; and finally, welding a plurality of the cast ingots which are primarily smelted with the heads downward and the bottoms upward in a vacuum consumable arc furnace to form new electrodes, remelting to obtain secondary cast ingots, and remelting again when necessary. In the process, the ingot cast after primary smelting needs to be welded in a vacuum consumable arc furnace before remelting, and the basic principle is that an upper electrode and a lower electrode are respectively a negative electrode and a positive electrode, electric arc is generated by using large current, and the upper electrode and the lower electrode are welded together after a welding surface is melted.
However, in the prior art, the bottom and the head of the ingot to be welded are both planes, and molten liquid is easy to flow down along the outer circle of the ingot to be welded at the lower part after being melted, so that the welding surface has insufficient molten metal, and the welding area is insufficient. The insufficient welding area easily leads to the lower cast ingot to fall off when smelting, falls into the molten pool, produces serious adverse effect to product quality, even produces when serious and falls the egg, leads to the direct arc starting of upper cast ingot and crucible to puncture the crucible, and cooling water gets into the crucible and explodes, has great quality and potential safety hazard.
In view of the above, the present inventors have made experience and practice in related industries for many years, and have proposed a method for improving the welding strength by increasing the weld surface of the remelted ingot, so as to overcome the drawbacks of the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for improving the welding strength by increasing the welding surface of a remelting ingot, which improves the structure of a crucible base pad for primary smelting to ensure that the edge of the bottom of the produced ingot is convex and the middle of the ingot is concave to be in a disc-shaped structure, the bottom of the ingot is used as a lower ingot, and then the upper ingot to be welded is correspondingly chamfered to be matched with the bottom of the lower ingot to be welded to form a welding surface with a gap, so that the welding area is greatly improved, in addition, metal solution can flow into the gap as far as possible in the welding process, the welding strength is obviously improved, the phenomenon that the lower ingot falls into a molten pool in the smelting process is effectively avoided, and the purpose of safe production is realized.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for improving welding strength by enlarging a remelting ingot welding surface comprises the following steps;
step one, arranging a crucible bottom pad for primary smelting
The crucible bottom pad is arranged into a circular truncated cone step structure with a concave outer ring edge and a convex inner ring, wherein the inner ring is connected with the outer ring through an inclined plane, so that the bottom edge of each primary ingot produced by the crucible bottom pad is in a convex structure, the middle of the primary ingot is in a concave platform structure, and the ingot with the convex edge and the concave platform middle is remelted and is arranged at the lower part;
step two, setting the other ingot to be remelted
Placing the edge of one end of the other ingot to be remelted on the upper part after chamfering, and enabling the chamfer of the upper ingot to be welded to be matched with the edge bulge of the lower ingot to form a welding surface with a gap;
step three, assembly welding connection
And finally, the upper cast ingot to be welded and the lower cast ingot to be welded are connected into a whole through the formed welding surface in a vacuum consumable arc furnace in an assembly welding way.
Furthermore, the range of the height of the inner ring bulge of the crucible bottom pad is 5 mm-30 mm.
Furthermore, the included angle between the inclined plane of the inner ring and the outer ring of the crucible bottom pad and the horizontal plane ranges from 30 degrees to 60 degrees.
Furthermore, the width range of the outer ring of the crucible bottom pad is 5 mm-30 mm.
Further, the height of the upper part of the cast ingot to be welded after chamfering is at least 5mm higher than the height of the inner ring bulge of the crucible bottom pad.
Further, the chamfer angle of the cast ingot to be welded on the upper part is the same as the included angle of the inclined plane of the crucible bottom pad.
Further, the width of the outer ring of the upper part to-be-welded cast ingot after chamfering is wider than the width of the outer ring of the crucible base pad by at least 5 mm.
Further, the width of a gap welding surface formed by the upper cast ingot to be welded and the lower cast ingot to be welded is more than or equal to 5 mm.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention designs a method for improving welding strength by increasing the welding surface of a remelting ingot, which is characterized in that a crucible bottom pad for primary smelting is set to be a circular step structure with a concave outer ring edge and a convex inner ring, wherein the inner ring and the outer ring are connected through an inclined plane, so that the bottom edge and the center of a produced primary ingot are convex, and the bottom of the ingot is in a disc-shaped structure. The edge bulge ingot is arranged at the lower part before remelting, one end of the other ingot to be remelted is arranged at the upper part after chamfering, so that the edge bulge of the ingot to be welded at the lower part is matched with the edge chamfer of the ingot at the upper part to form a welding surface with a gap, and finally, the ingot is assembled and welded into a whole in a vacuum consumable arc furnace. Through the setting, the welding area of upper and lower portion ingot casting has greatly been increased, and its lower part disk face of weld guarantees in addition that the welding melt does not flow from limit portion, and flows into the clearance with welding solution as far as in, is showing and is improving welding strength to avoided effectively realizing the safety in production under the circumstances of guaranteeing the quality because of welding area is not enough leads to the risk that the lower portion ingot casting drops when smelting, through the experiment proof, has very strong practicality.
Drawings
FIG. 1 is a flow chart of a method of increasing weld strength by increasing the weld face of a remelted ingot in accordance with the present invention;
FIG. 2 is a schematic view of the structure of the crucible bottom pad of the present invention.
FIG. 3 is a schematic view of the structure of an ingot to be welded at the upper part of the invention.
FIG. 4 is a schematic structural view of a weld face of a remelted ingot according to the present invention.
In the figure: 1 is a crucible bottom pad; 2, casting ingot to be welded at the upper part; 3, casting ingot to be welded at the lower part; 4 is a welding surface with a gap; w is the width of the gap welding surface; h1 is the height of the inner ring bulge of the crucible bottom pad; w1 is the width of the outer ring of the crucible bottom pad; alpha is the included angle of the inclined plane of the crucible bottom pad; h2 is the height of the upper part of the cast ingot to be welded after chamfering; beta is a chamfer angle of the cast ingot to be welded at the upper part; w2 is the width of the outer ring after the upper part of the cast ingot to be welded is chamfered.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and examples.
Examples
As shown in FIG. 1, the method for improving the welding strength by increasing the welding surface of the remelting ingot comprises the following steps:
step one, arranging a crucible bottom pad for primary smelting
Specifically, as shown in fig. 2, a crucible bottom pad 1 is arranged into a truncated cone step structure with a concave outer ring edge and a convex inner ring, wherein the inner ring is connected with the outer ring through an inclined plane, so that the bottom edge of each primary ingot produced by the crucible bottom pad is in a convex structure, the middle of the primary ingot is in a concave platform structure, and the ingot with the convex edge and the concave middle of the primary ingot is arranged at the lower part before remelting;
step two, setting the other ingot to be remelted
Placing the edge of one end of the other ingot to be remelted on the upper part after chamfering, and enabling the chamfer of the upper ingot to be welded to be matched with the edge bulge of the lower ingot to form a welding surface 4 with a gap;
step three, assembly welding connection
And finally, the upper cast ingot 2 to be welded and the lower cast ingot 3 to be welded are connected into a whole through the formed welding surface in a vacuum consumable arc furnace in an assembly welding way.
The inventor verifies through a large amount of experiments that welding raw materials can be saved on the premise of guaranteeing welding quality through the following setting, so as to be the preferred setting, specifically set as follows:
as shown in FIG. 2, the range of the height H1 of the inner ring of the crucible bottom pad is set to be 5 mm-30 mm, the range of the angle alpha between the inclined plane connected with the outer ring of the crucible bottom pad and the horizontal plane is set to be 30-60 degrees, and the range of the width W1 of the outer ring of the crucible bottom pad is set to be 5 mm-30 mm.
Correspondingly, as shown in fig. 3, the upper to-be-welded ingot is set, the height H2 of the chamfered upper to-be-welded ingot is at least 5mm higher than the protruding height H1 of the inner ring of the crucible base pad, the angle of the chamfer β of the upper to-be-welded ingot is the same as the included angle α of the inclined plane of the crucible base pad, and the width W2 of the chamfered outer ring of the upper to-be-welded ingot is at least 5mm wider than the width W1 of the outer ring of the crucible base pad. Through the arrangement, a welding surface with a certain gap is formed between the upper to-be-welded ingot 2 and the lower to-be-welded ingot 3, as shown in fig. 4, so that the connection strength of the upper to-be-welded ingot and the lower to-be-welded ingot is ensured.
Preferably, the width W of a gap welding surface formed by the upper cast ingot to be welded and the lower cast ingot to be welded is set to be more than or equal to 5mm, the gap is used as a welding groove, the root of a welding line is ensured to be completely welded, and a welding heat source can penetrate into the root of a joint to ensure the welding quality.
The working principle of the invention is as follows:
the crucible bottom pad structure for primary smelting is designed to be that the edge of an outer ring is recessed by 5-30 mm, the width of a platform at the recessed edge is 5-30 mm, and the included angle between the recessed edge and the raised inclined plane at the core is 30-60 degrees; then, the crucible bottom pad is used for producing an ingot, the bottom of the ingot is provided with a raised edge, the middle of the ingot is concave inwards to form a disc-shaped structure, the height of the raised edge and the height of the concave edge correspond to the height of a platform of the crucible bottom pad, before secondary smelting, the head of the ingot is downward, the bottom of the ingot is upward and is arranged at the lower part of the ingot, the ingot at the upper part of the ingot is subjected to chamfering treatment, and the chamfering height and the width of the platform at the edge part are at least 5mm greater than the depth and the width of the concave edge of the crucible bottom pad after primary smelting; and finally, when the cast ingot is welded in a vacuum consumable arc furnace, the upper cast ingot is a negative electrode, the lower cast ingot is a positive electrode, the metal ionization is utilized to generate electric arc to heat a welding surface, the generated molten liquid can be bound by the edge bulge of the lower cast ingot and cannot flow out from the outer circle of the lower cast ingot, the upper cast ingot is pressed downwards, and the welding surface is completely adhered. The method effectively avoids the problems of insufficient welding area and infirm welding caused by the fact that the melt flows down from the edge part when the traditional remelting ingot is welded in the electric arc furnace. Greatly promote welding area, guaranteed welding strength, can effectively avoid because welding area is not enough to lead to quality and the potential safety hazard that the lower part ingot casting dropped in the smelting process, have very strong practicality.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A method for improving welding strength by increasing a remelting ingot welding surface is characterized by comprising the following steps:
step one, arranging a crucible bottom pad for primary smelting
The crucible bottom pad is arranged into a circular truncated cone step structure with a concave outer ring edge and a convex inner ring, wherein the inner ring is connected with the outer ring through an inclined plane, so that the bottom edge of each primary ingot produced by the crucible bottom pad is in a convex structure, the middle of the primary ingot is in a concave platform structure, and the ingot with the convex edge and the concave platform middle is remelted and is arranged at the lower part;
step two, setting the other ingot to be remelted
Placing the edge of one end of the other ingot to be remelted on the upper part after chamfering, and enabling the chamfer of the upper ingot to be welded to be matched with the edge bulge of the lower ingot to form a welding surface with a gap;
step three, assembly welding connection
And finally, the upper cast ingot to be welded and the lower cast ingot to be welded are connected into a whole through the formed welding surface in a vacuum consumable arc furnace in an assembly welding way.
2. The method for improving the welding strength by increasing the welding surface of the remelted ingot according to claim 1, wherein the height (H1) of the inner ring bulge of the crucible bottom pad ranges from 5mm to 30 mm.
3. The method for improving the welding strength by increasing the welding surface of the remelted ingot according to claim 1, wherein the included angle (α) between the inclined surface of the inner ring and the outer ring of the crucible bottom pad and the horizontal plane is in the range of 30 ° to 60 °.
4. The method for improving the welding strength by increasing the welding surface of the remelted ingot according to claim 1, wherein the outer ring width (W1) of the crucible bottom pad is in the range of 5mm to 30 mm.
5. The method for improving the welding strength by increasing the welding surface of the remelted ingot according to claim 2, wherein the height (H2) of the upper chamfer of the ingot to be welded is at least 5mm higher than the height (H1) of the inner ring protrusion of the crucible bottom pad.
6. A method for improving the welding strength by increasing the welding surface of the remelted ingot according to claim 3, wherein the angle of the chamfer (β) of the upper ingot to be welded is the same as the angle of the included angle (α) of the inclined surface of the crucible bottom pad.
7. A method of improving the weld strength by increasing the weld face of the remelted ingot according to claim 4, wherein the width of the cup after chamfering (W2) of the upper to-be-welded ingot is wider than the width of the cup bottom pad cup (W1) by at least 5 mm.
8. A method for improving the welding strength by increasing the welding surface of the remelted ingot according to any one of claims 1 to 7, wherein the width (W) of the gap welding surface formed by the upper ingot to be welded and the lower ingot to be welded is 5mm or more.
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| CN202110823959.5A CN113601059A (en) | 2021-07-21 | 2021-07-21 | Method for improving welding strength by enlarging remelting ingot casting welding surface |
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| CN202110823959.5A CN113601059A (en) | 2021-07-21 | 2021-07-21 | Method for improving welding strength by enlarging remelting ingot casting welding surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116511645A (en) * | 2023-06-28 | 2023-08-01 | 西部超导材料科技股份有限公司 | Method for eliminating welding adhesion in titanium alloy ingot furnace |
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2021
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| RU2158662C2 (en) * | 1999-02-04 | 2000-11-10 | Открытое акционерное общество "НПО Энергомаш им. акад. В.П. Глушко" | Welded joint forming method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116511645A (en) * | 2023-06-28 | 2023-08-01 | 西部超导材料科技股份有限公司 | Method for eliminating welding adhesion in titanium alloy ingot furnace |
| CN116511645B (en) * | 2023-06-28 | 2023-10-27 | 西部超导材料科技股份有限公司 | Method for eliminating welding adhesion in titanium alloy ingot furnace |
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