CN113787249A - Explosive welding method for large-size metal composite plate - Google Patents
Explosive welding method for large-size metal composite plate Download PDFInfo
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- CN113787249A CN113787249A CN202111171321.4A CN202111171321A CN113787249A CN 113787249 A CN113787249 A CN 113787249A CN 202111171321 A CN202111171321 A CN 202111171321A CN 113787249 A CN113787249 A CN 113787249A
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/06—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of high energy impulses, e.g. magnetic energy
- B23K20/08—Explosive welding
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Abstract
The invention belongs to the technical field of explosive welding. The invention provides an explosive welding method of a large-size metal composite plate, which comprises the following steps: sequentially carrying out mechanical impact treatment and heating treatment on the substrate and the composite plate, and mounting to obtain a composite plate; after a detonating cord is fixed along the length direction of the compound plate, laying explosives on the compound plate; and taking the middle position of the detonating cord as an initiation point, and carrying out explosive welding on the composite plate to obtain the large-size metal composite plate. The bonding rate of the large-size metal composite plate obtained by the method reaches more than 99.8 percent, no crack and boundary effect exist, the bonding strength of a welding surface is high, and the phenomena of layering and desoldering do not occur; the method of the invention can reduce the exhaust path, reduce the detonation velocity of the explosive, prolong the detonation time, improve the detonation continuity and avoid the detonation phenomenon.
Description
Technical Field
The invention relates to the technical field of explosive welding, in particular to an explosive welding method for a large-size metal composite plate.
Background
Explosion welding is a connection technology which utilizes the huge energy generated instantaneously by explosive explosion as energy to make metal generate plastic deformation and melt and achieve interatomic bonding. The interface melting of two materials is not needed during welding, and the joint of the connected metals or alloys has little or no diffusion, so that each metal or alloy can keep the original characteristics, and the materials with large difference of melting points can be combined. Compared with the conventional dissimilar metal welding process, the explosive welding dissimilar metals are not limited in the variety and number. However, explosive welding processes often face extreme size limitations when explosive welding large size metals.
For the explosive welding process of large-size metal composite plates, due to the fact that the explosion speed is too high, the plate layers are long in length and large in thickness, the problems of increase of an exhaust path, boundary effect, explosion and the like are usually encountered in the explosion time, the bonding rate between the two plate layers is reduced, and particularly the edge bonding strength is not satisfactory. The metal composite plate is easy to generate the phenomena of layering, cracking and the like during subsequent processing and use, and the performance is seriously reduced.
Therefore, the explosion welding method for the large-size metal composite plate, which is used for improving the interface bonding strength, has no boundary effect, reducing the exhaust path, avoiding the occurrence of desoldering, explosion quenching, layering and cracking, is researched and developed, improves the processing and using performance of the large-size metal composite plate, and has very important value and significance.
Disclosure of Invention
The invention aims to provide an explosion welding method of a large-size metal composite plate aiming at the defects of the prior art. The method can improve the bonding rate of the large-size metal composite plate and the bonding strength of the welding surface, and avoid the occurrence of desoldering, layering, cracking and boundary effects.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an explosive welding method of a large-size metal composite plate, which comprises the following steps:
1) sequentially carrying out mechanical impact treatment and heating treatment on the substrate and the composite plate, and mounting to obtain a composite plate;
2) after a detonating cord is fixed along the length direction of the compound plate, laying explosives on the compound plate;
3) and taking the middle position of the detonating cord as an initiation point, and carrying out explosive welding on the composite plate to obtain the large-size metal composite plate.
Preferably, the substrate and the clad plate in step 1) are independently a pure metal plate or an alloy plate.
Preferably, in the mechanical impact treatment process in the step 1), the impact energy is 4-6J, the impact rate is 65-75 times/second, and the time is 4-10 min; the temperature of the heating treatment is 350-650 ℃, and the time is 1-3 h.
Preferably, in the length direction of the composite board in the step 1), both sides of the composite board are 35-45 mm longer than the base board; in the width direction, two sides of the compound plate are independently 45-65 mm wider than the substrate.
Preferably, the thickness of the substrate in the step 1) is 55-70 mm, and the thickness of the composite plate is 7-12 mm; in the composite board, the ratio of the distance between the substrate and the composite board to the thickness of the composite board is 1.3-2: 1.
preferably, when the width difference between the two sides of the composite plate and the substrate is different in the width direction, the detonating cord of step 2) is disposed on the composite plate except the composite plate and the substrate on the side where the width difference between the composite plate and the substrate is larger, and the length of the detonating cord is the same as the length of the composite plate.
Preferably, the explosive in the step 2) comprises powdery emulsion explosive, sodium chloride, calcium carbonate, perlite and wood activated carbon powder; the mass ratio of the powdery emulsion explosive to the sodium chloride to the calcium carbonate to the perlite to the wood activated carbon powder is 60-80: 20-25: 4-8: 5-8: 15-20.
Preferably, the detonation velocity of the powdery emulsion explosive is 2900-3100 m/s, the particle size of the explosive is 65-75 μm, and the laying thickness is 30-40 mm.
The beneficial effects of the invention include the following:
1) the bonding rate of the large-size metal composite plate obtained by the method of the invention reaches more than 99.8%, no crack and boundary effect exist, the bonding strength of the welding surface is high, and the phenomena of layering and desoldering do not occur.
2) The method of the invention can reduce the exhaust path, reduce the detonation velocity of the explosive, prolong the detonation time, improve the detonation continuity and avoid the detonation phenomenon.
3) The method has low production cost and high production efficiency, and obviously improves the processing performance and the service performance of the large-size metal composite plate.
Detailed Description
The invention provides an explosive welding method of a large-size metal composite plate, which comprises the following steps:
1) sequentially carrying out mechanical impact treatment and heating treatment on the substrate and the composite plate, and mounting to obtain a composite plate;
2) after a detonating cord is fixed along the length direction of the compound plate, laying explosives on the compound plate;
3) and taking the middle position of the detonating cord as an initiation point, and carrying out explosive welding on the composite plate to obtain the large-size metal composite plate.
The substrate and the composite plate in the step 1) of the invention are independent, and preferably are pure metal plates or alloy plates; the substrate is preferably a steel plate, an aluminum plate, a magnesium plate, a copper plate, an alloy steel plate, a zirconium plate, a nickel alloy plate, an aluminum alloy plate, a magnesium alloy plate, a titanium alloy plate, a copper alloy plate or a carbon steel plate; the length of the substrate is preferably 16500-17000 mm, more preferably 16700-169900 mm, and even more preferably 16800 mm; the width of the substrate is preferably 2100-2200 mm, more preferably 2120-2180 mm, and more preferably 2140-2160 mm; the composite plate is preferably a titanium plate, an aluminum alloy plate or a stainless steel plate; the length of the compound plate is preferably 16570-17090 mm, more preferably 16600-17000 mm, and even more preferably 16800-169900 mm; the width of the compound plate is preferably 2190-2330 mm, more preferably 2210-2300 mm, and even more preferably 2240-2260 mm.
Before the mechanical impact treatment, the base plate and the composite plate are preferably subjected to decontamination and polishing treatment, so that the bonding surface is exposed with metallic luster.
In the process of the mechanical impact treatment in the step 1), the impact energy is preferably 4-6J, more preferably 4.5-5.5J, more preferably 5J, the impact rate is preferably 65-75 times/second, more preferably 67-72 times/second, more preferably 69-70 times/second, and the time of the mechanical impact treatment is preferably 4-10 min, more preferably 6-9 min, more preferably 7-8 min; according to the mechanical impact treatment, each part is preferably subjected to uniform mechanical impact treatment, and further, the same position is preferably continuously impacted for 2-4 seconds.
The temperature of the heating treatment in the step 1) is preferably 350-650 ℃, more preferably 400-600 ℃, and more preferably 450-550 ℃; the time of the heat treatment is preferably 1 to 3 hours, more preferably 1.5 to 2.5 hours, and even more preferably 2 hours.
The invention can provide microstructures with different sizes after the base plate and the compound plate are subjected to mechanical impact treatment and heating treatment, reduces the defects of cracks and the like during explosive cladding, can induce a large number of crystal structure defects on the surfaces of the base plate and the compound plate, improves the interface bonding strength of the compound plate, particularly the edge of the compound plate, prevents the phenomena of layering and cracking, and has no boundary effect.
In the length direction of the composite board in the step 1), both sides of the composite board are preferably 35-45 mm longer than the substrate, more preferably 37-42 mm, and even more preferably 39-40 mm; in the width direction, the two sides of the compound plate are preferably 45-65 mm, more preferably 48-62 mm, and even more preferably 52-58 mm wider than the substrate.
The thickness of the substrate in the step 1) is preferably 55-70 mm, more preferably 60-68 mm, and even more preferably 62-65 mm; the thickness of the composite plate is preferably 7-12 mm, more preferably 9-11 mm, and even more preferably 10 mm; in the composite board, the preferred proportion of distance between base plate, the compound board and compound board thickness is 1.3 ~ 2: 1, more preferably 1.5 to 1.8:1, and still more preferably 1.6 to 1.7: 1.
In the present invention, when the width difference between the two sides of the composite plate and the substrate is different in the width direction, the detonating cord described in step 2) is preferably disposed on the composite plate except the substrate on the side where the width difference between the composite plate and the substrate is larger, and the length of the detonating cord is preferably the same as the length of the composite plate.
The detonating fuse for detonating the explosive is arranged outside the substrate, so that the defect of edge non-compounding caused by the high energy of the detonating fuse is avoided.
The explosive in the step 2) preferably comprises powdery emulsion explosive, sodium chloride, calcium carbonate, perlite and wood activated carbon powder; the mass ratio of the powdery emulsion explosive, the sodium chloride, the calcium carbonate, the perlite and the wood activated carbon powder is preferably 60-80: 20-25: 4-8: 5-8: 15-20, more preferably 65-75: 21-24: 5-7: 6-7: 16-18, and even more preferably 68-72: 22-23: 6:6.5: 17.
The calcium carbonate and the perlite can reduce the explosion speed; the combustibility of the wood activated carbon powder can further increase the continuous combustion performance of the explosive coating, so that the explosion velocity of the explosive is reduced, the explosion continuity of the explosive is improved, and the phenomena of desoldering and explosion are avoided.
The explosive disclosed by the invention can reduce the explosion speed, further increase the explosion time and increase the action time of the explosion action force, so that the base plate and the composite plate can be deformed in sufficient time and can be firmly welded together.
The detonation velocity of the powdery emulsion explosive is preferably 2900-3100 m/s, more preferably 2950-3050 m/s, and even more preferably 3000 m/s; the particle size of the explosive is preferably 65-75 μm, more preferably 68-72 μm, and even more preferably 70 μm; the laying thickness of the explosive is preferably 30-40 mm, more preferably 32-38 mm, and even more preferably 34-36 mm.
The laying size and area of the explosive are preferably the same as those of the clad plate and are larger than those of the substrate, so that the damage to the edge of the clad metal plate caused by energy unloading and the tensile wave formed by the energy unloading when the explosive reaches the edge of the clad metal plate is avoided.
The explosion welding of the invention adopts energy-gathering initiation, simultaneously adopts initiation on the compound plate outside the base plate, and initiates at the middle position in the length direction of the compound plate, so that the initiation point can be led out of the composite plate, the condition that the initiation point generated by high strength and composite plate material explosion cladding is not adhered in large area is avoided, and the initiation point can be initiated towards two sides simultaneously at the middle position in the length direction, thereby reducing the exhaust path. In the implementation process of the explosive welding process, energy-gathered initiation is adopted, and a detonator detonates a detonating cord and an explosive, so that the high-strength multilayer is deformed at high speed and instantaneously impacted to two sides, and two conditions of explosive combination are created: the impingement angle of the cladding and the metal jet on the surface of the base cladding. If a common initiation mode is adopted, the deformation of the multiple layers is slow, and a long time is needed for reaching the basic explosion compounding condition, so that a large area of non-joint is formed near the initiation point.
Annealing, cooling, ultrasonic detecting and leveling are preferably carried out on the composite plate obtained after the explosion welding in the step 3) in sequence to obtain a large-size metal composite plate; the annealing temperature is preferably 350-650 ℃, more preferably 400-600 ℃, and more preferably 450-550 ℃; the annealing time is preferably 2-4 h, and more preferably 3 h.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The steel plate is used as a base plate, the aluminum alloy plate is used as a clad plate, and the base plate and the clad plate are respectively subjected to decontamination, grinding and polishing treatment, so that the metal luster is exposed on the bonding surface, and the roughness of the bonding surface is 1.4 mu m. Wherein, the length, width and thickness of the base plate are 16600mm, 2100mm and 57mm respectively, the length, width and thickness of the compound plate are 16670mm, 2210mm and 8mm respectively, in the length direction, both sides of the compound plate are 35mm longer than the base, in the width direction, both sides of the compound plate are 45mm and 65mm wider than the base respectively.
And respectively carrying out mechanical impact treatment and heating treatment on the polished substrate and the polished composite plate under the same condition, wherein in the mechanical processing treatment process, the impact energy is 4J, the impact rate is 65 times/second, and the time is 5 min. And after the mechanical impact treatment is finished, respectively carrying out heating treatment on the substrate and the composite plate at 430 ℃, wherein the heating treatment time is 3 h. And then, mounting the substrate and the composite plate to obtain the composite plate, wherein the distance between the substrate and the composite plate in the composite plate is 12 mm.
A detonating cord is fixed on a composite plate outside a base plate with the width difference of 65mm along the length direction of the composite plate, the length of the detonating cord is the same as that of the composite plate, then explosives are uniformly paved on the composite plate, the area of the explosives is the same as that of the composite plate, the explosives comprise powdery emulsion explosives (the detonation velocity is 2900m/s), sodium chloride, calcium carbonate, perlite and wood activated carbon powder with the mass ratio of 62:21:4:5:15, the paving thickness of the explosives is 32mm, and the particle size is 65 mu m.
And (3) detonating by using a detonator by taking the middle position of the detonating cord as a detonating point, carrying out explosive welding on the composite board, annealing the composite board subjected to explosive welding at 420 ℃ for 4 hours, and then carrying out cooling, ultrasonic detection and leveling treatment by a straightening machine to obtain the large-size metal composite board.
The bonding rate and the bonding strength of the welding surface of the large-size metal composite plate in the embodiment 1 are tested, the bonding rate is 99.8%, no crack and boundary effect exist, the lowest value of the bonding strength of the welding surface is 160MPa, no desoldering and no layering phenomenon exist, and the detonation velocity of the explosive in the embodiment 1 is 2050 m/s.
Example 2
The copper plate is used as a substrate, the stainless steel plate is used as a clad plate, and the substrate and the clad plate are respectively subjected to decontamination, grinding and polishing treatment, so that the metal luster is exposed on the bonding surface, and the roughness of the bonding surface is 1.45 mu m. Wherein, the length, width and thickness of the base plate are 169900 mm, 2180mm and 67mm respectively, the length, width and thickness of the compound plate are 16990mm, 2285mm and 11mm respectively, in the length direction, both sides of the compound plate are 45mm longer than the base, in the width direction, both sides of the compound plate are 45mm wider than the base plate and 60mm respectively.
And respectively carrying out mechanical impact treatment and heating treatment on the polished substrate and the polished composite plate under the same condition, wherein in the mechanical processing treatment process, the impact energy is 6J, the impact rate is 75 times/second, and the time is 9 min. And after the mechanical impact treatment is finished, the substrate and the composite plate are respectively subjected to heating treatment at the temperature of 620 ℃, and the heating treatment time is 1 h. And then, mounting the substrate and the composite plate to obtain the composite plate, wherein the distance between the substrate and the composite plate in the composite plate is 18 mm.
A detonating cord is fixed on a composite plate outside a base plate with the width difference of 60mm along the length direction of the composite plate, the length of the detonating cord is the same as that of the composite plate, then explosives are uniformly paved on the composite plate, the area of the explosives is the same as that of the composite plate, the explosives comprise powdery emulsion explosives (the detonation velocity is 3100m/s), sodium chloride, calcium carbonate, perlite and wood activated carbon powder with the mass ratio of 78:25:8:7:20, the paving thickness of the explosives is 38mm, and the particle size is 73 mu m.
And (3) detonating by using a detonator by taking the middle position of the detonating cord as a detonating point, carrying out explosive welding on the composite board, annealing the composite board subjected to explosive welding at 630 ℃ for 2h, and then carrying out cooling, ultrasonic detection and leveling treatment by a straightening machine to obtain the large-size metal composite board.
The bonding rate and the bonding strength of the welding surface of the large-size metal composite plate in the embodiment 2 are tested, the bonding rate is 99.9%, no crack and boundary effect exist, the lowest value of the bonding strength of the welding surface is 220MPa, no desoldering and no layering phenomenon exist, and the detonation velocity of the explosive in the embodiment 2 is 2080 m/s.
Example 3
The copper alloy plate is used as a base plate, the titanium plate is used as a composite plate, and the base plate and the composite plate are respectively subjected to decontamination, grinding and polishing treatment, so that the metal luster is exposed on the joint surface, and the roughness of the joint surface is 1.4 mu m. Wherein, the length, width and thickness of the substrate are 16700mm, 2150mm and 62mm respectively, the length, width and thickness of the compound plate are 16780mm, 2250mm and 9mm respectively, in the length direction, both sides of the compound plate are 40mm longer than the substrate, in the width direction, both sides of the compound plate are 45mm and 55mm wider than the substrate respectively.
And respectively carrying out mechanical impact treatment and heating treatment on the polished substrate and the polished composite plate under the same condition, wherein in the mechanical processing treatment process, the impact energy is 5J, the impact rate is 70 times/second, and the time is 7 min. And after the mechanical impact treatment is finished, respectively carrying out heating treatment on the substrate and the composite plate at 550 ℃, wherein the heating treatment time is 2 h. And then, mounting the substrate and the composite plate to obtain the composite plate, wherein the distance between the substrate and the composite plate in the composite plate is 14 mm.
A detonating cord is fixed on a composite plate outside a base plate with the width difference of 55mm along the length direction of the composite plate, the length of the detonating cord is the same as that of the composite plate, then explosives are uniformly paved on the composite plate, the area of the explosives is the same as that of the composite plate, the explosives comprise powdery emulsion explosives (the detonation velocity is 3000m/s), sodium chloride, calcium carbonate, perlite and wood activated carbon powder with the mass ratio of 70:22:6:6:17, the paving thickness of the explosives is 35mm, and the particle size is 70 mu m.
And (3) detonating by using a detonator by taking the middle position of the detonating cord as a detonating point, carrying out explosive welding on the composite board, annealing the composite board subjected to explosive welding at 560 ℃ for 3h, and then carrying out cooling, ultrasonic detection and leveling treatment by a straightening machine to obtain the large-size metal composite board.
The bonding rate and the bonding strength of the welding surface of the large-size metal composite plate in the embodiment 3 are tested, the bonding rate is 100%, no crack and boundary effect exist, the lowest value of the bonding strength of the welding surface is 250MPa, no desoldering and no layering phenomenon exist, and the detonation velocity of the explosive in the embodiment 3 is 2000 m/s.
Comparative example 1
The mechanical impact treatment step of the substrate and the clad sheet of example 3 was omitted, and the temperature of the heat treatment was changed to 450 ℃ under the same conditions as in example 3.
The bonding rate and the bonding strength of the welding surface of the large-size metal composite plate in the comparative example 1 are tested, the bonding rate is 96.1%, a small amount of cracks and boundary effects exist, the lowest value of the bonding strength of the welding surface is 210MPa, and the phenomena of desoldering and delamination occur.
Comparative example 2
The heating treatment step of the base plate and the composite plate in example 3 was omitted, the mass ratio of the powdery emulsion explosive, sodium chloride, calcium carbonate, perlite and the wood activated carbon powder was changed to 85:20:2:3:10, and the other conditions were the same as in example 3.
The bonding rate and the bonding strength of the welding surface of the large-size metal composite plate in the comparative example 2 are tested, the bonding rate is 96.6%, a small amount of cracks and boundary effects exist, the lowest value of the bonding strength of the welding surface is 215MPa, the phenomena of desoldering and delamination occur, and the detonation velocity of the explosive in the comparative example 2 is 2250 m/s.
Comparative example 3
The calcium carbonate and the wood-based activated carbon powder in the explosive of example 3 were omitted, and the other conditions were the same as in example 3.
The bonding rate and the bonding strength of the welding surface of the large-size metal composite plate in the comparative example 3 are tested, the bonding rate is 97.3%, a small amount of cracks and boundary effects exist, the lowest value of the bonding strength of the welding surface is 230MPa, and the detonation velocity of the explosive in the comparative example 3 is 2300 m/s.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. An explosive welding method for large-size metal composite plates is characterized by comprising the following steps:
1) sequentially carrying out mechanical impact treatment and heating treatment on the substrate and the composite plate, and mounting to obtain a composite plate;
2) after a detonating cord is fixed along the length direction of the compound plate, laying explosives on the compound plate;
3) and taking the middle position of the detonating cord as an initiation point, and carrying out explosive welding on the composite plate to obtain the large-size metal composite plate.
2. The explosive welding method according to claim 1, wherein said base plate and said clad plate of step 1) are independently a pure metal plate or an alloy plate.
3. The explosive welding method according to claim 1 or 2, characterized in that, in the mechanical impact treatment in step 1), the impact energy is 4-6J, the impact rate is 65-75 times/second, and the time is 4-10 min; the temperature of the heating treatment is 350-650 ℃, and the time is 1-3 h.
4. The explosion welding method according to claim 3, wherein, in the length direction of the composite board in the step 1), both sides of the composite board are 35-45 mm longer than the base board; in the width direction, two sides of the compound plate are independently 45-65 mm wider than the substrate.
5. The explosive welding method according to claim 4, wherein the thickness of said substrate in step 1) is 55 to 70mm, and the thickness of said clad plate is 7 to 12 mm; in the composite board, the ratio of the distance between the substrate and the composite board to the thickness of the composite board is 1.3-2: 1.
6. the explosion welding method according to claim 4 or 5, wherein when the width difference between the two sides of the clad plate and the base plate is different in the width direction, the detonating cord of step 2) is provided on the clad plate other than the clad plate and the base plate on the side where the width difference between the clad plate and the base plate is larger, and the length of the detonating cord is the same as the length of the clad plate.
7. The explosive welding method according to claim 6, wherein said explosive of step 2) comprises powdered emulsion explosive, sodium chloride, calcium carbonate, perlite and wooden activated carbon powder; the mass ratio of the powdery emulsion explosive to the sodium chloride to the calcium carbonate to the perlite to the wood activated carbon powder is 60-80: 20-25: 4-8: 5-8: 15-20.
8. The explosive welding method according to claim 7, wherein the detonation velocity of the powdery emulsion explosive is 2900 to 3100m/s, the particle diameter of the explosive is 65 to 75 μm, and the thickness of the explosive laid is 30 to 40 mm.
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| CN114907176A (en) * | 2022-05-20 | 2022-08-16 | 四川钛程钛业有限公司 | Novel high-manganese explosive composite explosive and preparation method thereof |
| CN115064756A (en) * | 2022-08-17 | 2022-09-16 | 时代广汽动力电池有限公司 | Preparation process of high-performance vehicle-mounted new energy battery |
| CN115197035A (en) * | 2022-07-14 | 2022-10-18 | 攀枝花学院 | Explosive composite explosive and preparation method thereof |
| CN117483931A (en) * | 2024-01-03 | 2024-02-02 | 四川钛程钛业有限公司 | Explosion welding preparation method of novel marine metal composite board |
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| CN115197035A (en) * | 2022-07-14 | 2022-10-18 | 攀枝花学院 | Explosive composite explosive and preparation method thereof |
| CN115064756A (en) * | 2022-08-17 | 2022-09-16 | 时代广汽动力电池有限公司 | Preparation process of high-performance vehicle-mounted new energy battery |
| CN115064756B (en) * | 2022-08-17 | 2022-11-18 | 时代广汽动力电池有限公司 | Preparation process of high-performance vehicle-mounted new energy battery |
| CN117483931A (en) * | 2024-01-03 | 2024-02-02 | 四川钛程钛业有限公司 | Explosion welding preparation method of novel marine metal composite board |
| CN117483931B (en) * | 2024-01-03 | 2024-04-23 | 四川钛程钛业有限公司 | Explosion welding preparation method of novel marine metal composite board |
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