CN110860776B - Welding device and welding method for low-melting-point alloy and application - Google Patents
Welding device and welding method for low-melting-point alloy and application Download PDFInfo
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- CN110860776B CN110860776B CN201911137153.XA CN201911137153A CN110860776B CN 110860776 B CN110860776 B CN 110860776B CN 201911137153 A CN201911137153 A CN 201911137153A CN 110860776 B CN110860776 B CN 110860776B
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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
- B23K13/00—Welding by high-frequency current heating
- B23K13/06—Welding by high-frequency current heating characterised by the shielding of the welding zone against influence of the surrounding atmosphere
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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
- B23K13/00—Welding by high-frequency current heating
- B23K13/04—Welding by high-frequency current heating by conduction heating
- B23K13/043—Seam welding
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/15—Magnesium or alloys thereof
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Abstract
The invention relates to a welding device and a welding method for low-melting-point alloy. Comprises a closed container, an aerating device and a vacuumizing device; two opposite horizontal extrusion chucks are transversely arranged in the closed container, one end of each horizontal extrusion chuck is connected with the inner wall of the closed container, two opposite heating devices are vertically arranged in the closed container, one end of each heating device is connected with the inner wall of the closed container, and a processing space of a welding joint is formed between the two horizontal extrusion chucks and the two heating devices; the heating device comprises a vertical telescopic device and heating blocks, the heating blocks are of structures with tip ends, and the tip ends of the two heating blocks are respectively opposite to the welding seam; the inflation device is positioned at the outer side of the closed container, is connected with the closed container and is used for filling protective gas into the closed container; the vacuumizing device is positioned on the outer side of the closed container and is connected with the closed container. The application in the welding of the magnesium alloy or the aluminum alloy has the effects of enabling the structure grains of a welding joint to be fine and enabling the structure to be compact and improving the mechanical property.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a welding device for low-melting-point alloy, a welding method and application.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Besides steel materials, aluminum alloy is the most widely used alloy in industrial production, has a series of advantages of low density, high mechanical strength, strong corrosion resistance and the like, and is widely applied to the fields of automobile manufacturing, ship manufacturing, aerospace, national defense industry, pressure vessels and the like. Magnesium and magnesium alloy are the lightest metal structural materials at present, have many irreplaceable performances such as high specific strength, high specific elastic modulus, high damping performance, high machinability and the like, are known as 'green engineering materials in the 21 st century', and are widely applied in the fields of aviation, aerospace, automotive electronics and the like.
The welding technology of aluminum alloy and magnesium alloy is an indispensable important part in the aspects of promoting light weight of products, reducing oil consumption, reducing environmental pressure and the like, is a basic technology which is mainly developed in China at present, and is also a key field for research of material workers in various countries.
The heat conductivity of the aluminum alloy and the magnesium alloy is about 2-3 times that of steel materials, and metal overheating and large grains are easily caused in a welding line area and a near welding line area in the fusion welding process. In addition, defects such as air holes and shrinkage porosity are easily formed in the welding process, the microstructure is not dense enough, and the mechanical property of a welding joint is generally far lower than that of a base material, particularly the base material with a deformation structure. Therefore, a great deal of researchers have been improving the mechanical properties of welded joints by reducing the heat input to the weld, reducing the grain size of the weld structure, annealing after welding, and the like. The above methods all have certain effects, but the effects are not obvious. At present, a new welding method is urgently needed to improve the welding performance.
Disclosure of Invention
In view of the problems in the prior art, the present invention aims to provide a welding device for low melting point alloy, a welding method and applications.
In order to solve the technical problems, the technical scheme of the invention is as follows:
in a first aspect, a welding device for low melting point alloy comprises a closed container, an air charging device and a vacuum pumping device;
two opposite extrusion chucks capable of horizontally moving are transversely arranged in the closed container, one end of each horizontal extrusion chuck is connected with the inner wall of the closed container, two opposite heating devices are vertically arranged in the closed container, one end of each heating device is connected with the inner wall of the closed container, and a processing space of a welding joint is formed between each two horizontal extrusion chucks and each two heating devices;
the heating device comprises a vertical telescopic device and heating blocks, the heating blocks are positioned above the vertical telescopic device and connected with the top of the vertical telescopic device, the heating blocks are of structures with sharp ends, and the sharp ends of the two heating blocks are respectively opposite to the welding seam;
the inflation device is positioned at the outer side of the closed container, is connected with the closed container and is used for filling protective gas into the closed container;
the vacuumizing device is positioned on the outer side of the closed container and is connected with the closed container.
The invention provides an extrusion welding method for a closed container, which changes a welding joint tissue from an as-cast tissue to an extruded tissue by a heating melting-high temperature extrusion method to improve the mechanical property of a welding joint.
In some embodiments, two horizontal extrusion chucks are connected to one clamp block, and the two clamp blocks are located between the two horizontal extrusion chucks. The horizontal extrusion head can transversely and horizontally move, and the clamping block is a clamping block with adjustable size.
In some embodiments, the heating block is a heating device having a high frequency coil disposed therein; preferably, the heating block has a conical structure, and the high-frequency coil is located on the central axis and opposite to the weld.
In some embodiments, a displacement sensor is arranged inside the horizontal extrusion chuck, and a first temperature sensor is arranged inside the clamping block; a pressure sensor is arranged in the vertical telescopic device, and a second temperature sensor is arranged in the heating block; an air pressure sensor is arranged in the closed container.
In some embodiments, the outside of the closed container is provided with an overall controller;
preferably, the horizontal extrusion chuck, the vertical telescopic device, the heating block and the displacement sensor are respectively connected with the master controller.
Preferably, the first temperature sensor, the pressure sensor, the second temperature sensor and the air pressure sensor are respectively connected with the master controller.
In some embodiments, a pressure gauge and a flow meter are arranged on a pipeline connecting the air charging device and the closed container.
In a second aspect, the welding method using the welding device for low melting point alloy includes the following steps:
respectively preprocessing the welding joints of two plates to be welded, processing the welding joints, putting the processed welding joints into a closed container, and respectively clamping one plate to be welded by using a clamping block so as to enable the welding joints of the two plates to be opposite;
vacuumizing the closed container, and filling protective gas after vacuumizing;
aligning the tip of the heating block with the welding seam, heating the welding seam by using the heating block, cooling, starting extrusion and keeping constant temperature after cooling to a first set temperature, starting horizontal movement of a horizontal extrusion chuck to extrude a plate inwards when cooling to a second set temperature, keeping for a period of time after moving, and stopping heating and extrusion;
and (5) closing the protective gas after the temperature is reduced to a certain temperature, and discharging the gas pressure.
The pretreatment process is to remove the surface oxide layer and organic impurities.
In some embodiments, the processing of the weld joint is to step (or saw tooth) the weld joint, increase the contact area of the joints of the sheets to be welded, and the shapes of the two weld joints snap into each other. Through processing, the two welding joints can be mutually occluded and fastened, and the stability of mutual contact of the two welding joints is facilitated.
In some embodiments, the vacuum after evacuation is less than 10 millipascals. The vacuum is mainly used for exhausting air in the closed container.
In some embodiments, after the protective gas is filled, the pressure of the gas in the closed container is 30-50 MPa. The protective gas is filled to prevent the plate from being oxidized at high temperature. The effect of the air pressure in the closed container is to facilitate the plastic flow of the welding seam tissue.
In some embodiments, the heating block is heated to a temperature of 950-. The heating block with the tip has the effect of rapidly melting the weld zone.
In some embodiments, the first set temperature is 450-570 ℃, the horizontal extrusion is started at the set temperature, the pressure applied by the horizontal extrusion chuck is 5-9 MPa, and the second set temperature is 400-550 ℃. Preferably, the displacement speed of the horizontal extrusion chuck is 0.2-1 mm/s, and the unidirectional total displacement is 3-6 mm. Preferably, the horizontal extrusion chuck keeps extrusion for 30-100 min. After heating and melting, crystal grains of the two welding joints begin to combine under certain pressure, and then the welding plate is horizontally extruded in a high-temperature plastic temperature area of the material, so that the microstructure of the welding joints is changed from a loose cast structure into an extruded structure with a compact structure and finer crystal grain size, and the welding structure form is greatly improved. In some embodiments, the shielding gas is turned off after cooling to below 50 ℃ and the gas pressure is vented. When the temperature is cooled to a certain temperature, the structure of the welding joint is stable and then the air pressure is released.
In a third aspect, the welding device and the welding method for the low-melting-point alloy are applied to welding of magnesium alloy or aluminum alloy.
The invention has the beneficial effects that:
the novel welding device and the novel welding method for the aluminum/magnesium low-melting-point alloy can be used for deforming-welding the aluminum alloy and the magnesium alloy, and the final welding structure of a welding seam area is changed from an as-cast structure with coarse grains and a loose structure into a deformed structure with fine grains and a compact structure, so that the mechanical property of a welding joint is greatly improved. Meanwhile, the welding process realizes one-time welding of the whole welding line, avoids the influence on the rear half section caused by heat input of the welding front half section in the conventional melting welding process, and ensures the consistency and uniformity of the welding quality of the whole welding line.
The welding device and the welding method solve the defects that the low-melting-point alloy is easy to form air holes and shrink loose, the microstructure is not dense enough and the like in the welding process, and avoid the phenomenon that the mechanical property of a welding joint is far lower than that of a base metal.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of a welding apparatus;
FIG. 2 is a schematic view of a step-shaped assembly of a plate to be welded; a is before assembling, and b is after assembling;
the device comprises a horizontal extrusion chuck 1, a horizontal extrusion chuck 2, a displacement sensor 3, a temperature sensor 4, a clamping block 5, a plate to be welded 6, a heating device 7, a pressure sensor 8, a high-frequency coil 9, a temperature sensor 10, an air charging device 11, a pressure gauge 12, a flow meter 13, an air pressure sensor 14, a vacuumizing device 15, a closed container 16 and a master controller.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
A horizontal pressing jaw is a device that applies a pressing force in a horizontal direction.
As shown in FIG. 1, a welding device for low melting point alloy comprises a closed container 15, an air charging device 10 and a vacuum pumping device 14;
two opposite horizontal extrusion chucks 1 are transversely arranged in the closed container 15, one end of each horizontal extrusion chuck 1 is connected with the inner wall of the closed container 15, two opposite heating devices 6 are vertically arranged in the closed container 15, one end of each heating device 6 is connected with the inner wall of the closed container 15, and a processing space of a welded joint is formed between each two horizontal extrusion chucks 1 and each two heating devices 6;
the heating device 6 comprises a vertical telescopic device and heating blocks, the heating blocks are of structures with tip ends, and the tip ends of the two heating blocks are respectively opposite to the welding seam;
the inflator 10 is positioned outside the closed container 15, is connected with the closed container 15, and fills protective gas into the closed container 15;
the vacuum extractor 14 is located outside the closed vessel 15 and connected to the closed vessel 15.
Two plates to be welded are respectively clamped by two horizontal extrusion chucks 1 in a closed container 15 and are opposite, the tips of two heating blocks are opposite to the welding seams of the two plates to be welded in the longitudinal direction, the welding seam parts are heated to be melted, then the horizontal extrusion chucks are controlled to clamp and compress the welding joint, welding is realized, the structure crystal grains of the welding joint are fine, the structure is compact, and the mechanical property of the welding joint is improved.
The extrusion effect through the extrusion chuck makes the welding seam organize the effect that warp little after melting, and the upper and lower of welded joint still receives the pressure effect of heating piece simultaneously, so welded joint about, can both organize evenly, the structure is closely knit.
The two horizontal extrusion chucks 1 are respectively connected with a clamping block 4, and the two clamping blocks 4 are positioned between the two horizontal extrusion chucks 1. Preferably, the clamping block 4 is a clamping block 4 with adjustable size. The clamping blocks 4 can meet the function of fixing the plates to be welded.
The heating block is a heating device with a high-frequency coil 8 arranged inside; preferably, the heating block has a conical structure, and the high-frequency coil is located on the central axis and opposite to the weld. The heating block is arranged to be of a structure with a tip, has the function of enabling the heat transfer point to be located at the position opposite to the welding line, can have the function of enabling heat to be concentrated, and also has the function of avoiding the temperature of other parts from being too high. The high-frequency coil 8 may be a high-frequency copper coil.
A displacement sensor 2 is arranged in the horizontal extrusion chuck 1, and a first temperature sensor 3 is arranged in the clamping block; a pressure sensor 7 is arranged in the vertical telescopic device, and a second temperature sensor 9 is arranged in the heating block; the air pressure sensor 13 is provided inside the closed casing 15.
A master controller 16 is arranged on the outer side of the closed container 15;
preferably, the horizontal extrusion chuck 1, the vertical telescopic device, the heating block and the displacement sensor are respectively connected with a master controller.
Preferably, the first temperature sensor, the pressure sensor, the second temperature sensor and the air pressure sensor are respectively connected with the master controller.
The master controller 16 can control the speed and displacement of the vertical telescopic device to move up and down longitudinally, the displacement speed and displacement of the horizontal extrusion chuck, the pressure of the heating block on the plate and the real-time temperature of the heating block.
A pressure gauge 11 and a flowmeter 12 are arranged on a pipeline connecting the air charging device 10 and the closed container 15.
Example 1
Utilize this device to weld 6061 aluminum alloy:
(1) the 6061 aluminum alloy welding joint plate is 3mm in thickness and 110 multiplied by 60mm in size, the edge of the plate to be welded is machined into a step shape, then surface dirt is removed through abrasive paper, and surface grease is removed through acetone;
(2) placing the treated 6061 aluminum alloy plate into a closed container, utilizing a horizontal extrusion chuck, adjusting the size of a clamping block, coating and clamping the plate to be welded, and mutually meshing and fastening the two plates;
(3) vacuumizing the closed box, filling a certain amount of argon, and performing gas protection on the 6061 aluminum alloy plate to prevent the welding plate from being oxidized at high temperature;
(4) electrifying the telescopic contact type heating block to heat to 900 ℃ in a high frequency mode, extending the upper heating block and the lower heating block to the upper surface and the lower surface of the 6061 aluminum alloy plate to be in complete contact, quickly heating the boundary area of the 6061 aluminum alloy plate in full size at one time, and melting the whole welding line area at one time;
(5) when the 6061 aluminum alloy plate is heated at high temperature and the whole welding seam area is melted at one time, the heating block stops heating, the temperature is reduced to 520 ℃, and 8MPa pressure is applied to the welding plate. At the moment, the welding seam area is cooled to 520 ℃, two horizontal extrusion chucks horizontally move relatively, the displacement speed is 0.7mm/s, the displacement is 4mm, two plates to be welded are extruded inwards and kept for 70min, then the upper heating block and the lower heating block completely stop heating, and the plates shrink and retract;
(6) and (3) after the temperature of the 6061 aluminum alloy plate is reduced to below 50 ℃, relaxing the extrusion force of the horizontal extrusion chuck, closing the protective gas, recovering the gas pressure to the standard atmospheric pressure, unloading the clamping block, and taking out the welded plate.
(7) The tensile property test of the 6061 aluminum alloy welded joint and the parent metal thereof is carried out, the tensile strength of the welded joint reaches 80.8 percent of that of the parent metal, and the test results are shown in table 1.
Example 2
The device is used for welding the AZ80 magnesium alloy:
(1) the thickness of the AZ80 magnesium alloy welding joint plate is 4mm, the size is 120 multiplied by 50mm, the edge of the plate to be welded is processed into a step shape, then surface dirt is removed by abrasive paper, and surface grease is removed by acetone;
(2) placing the processed AZ80 magnesium alloy plate into a closed container, utilizing a horizontal extrusion chuck, adjusting the size of a clamping block, coating and clamping the plate to be welded, and mutually meshing and fastening the two plates;
(3) vacuumizing the closed box, filling a certain amount of argon, and performing gas protection on the AZ80 magnesium alloy plate to prevent the welded plate from being oxidized at high temperature;
(4) electrifying and high-frequency heating the telescopic contact type heating blocks to 850 ℃, extending the upper heating blocks and the lower heating blocks to the upper surface and the lower surface of the AZ80 magnesium alloy plate to be completely contacted, quickly heating the boundary area of the AZ80 magnesium alloy plate in full size at one time, and melting the whole welding line area at one time;
(5) and when the AZ80 magnesium alloy plate is heated at high temperature and the whole welding seam area is melted at one time, the heating block stops heating, the temperature is reduced to 480 ℃, and 8MPa pressure is applied to the welding plate. At the moment, the welding seam area is cooled to 480 ℃, two horizontal extrusion chucks horizontally move relatively, the displacement speed is 0.6mm/s, the displacement is 3.5mm, two plates to be welded are extruded inwards and kept for 80min, then the upper heating block and the lower heating block completely stop heating, and the plates shrink and retract;
(6) and after the temperature of the AZ80 magnesium alloy plate is reduced to below 50 ℃, gradually reducing the extrusion force of the horizontal extrusion chuck, loosening the clamping block, closing the protective gas, recovering the gas pressure to the standard atmospheric pressure, and taking out the welded plate.
(7) The tensile property test of the AZ80 magnesium alloy welded joint and the parent metal thereof is carried out, the tensile strength of the welded joint reaches 82.2% of that of the parent metal, and the test results are shown in Table 1.
TABLE 1
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A welding device for low-melting-point alloy is characterized in that: comprises a closed container, an aerating device and a vacuumizing device;
two opposite horizontal extrusion chucks are transversely arranged in the closed container, one end of each horizontal extrusion chuck is connected with the inner wall of the closed container, two opposite heating devices are vertically arranged in the closed container, one end of each heating device is connected with the inner wall of the closed container, and a processing space of a welding joint is formed between the two horizontal extrusion chucks and the two heating devices;
the heating device comprises a vertical telescopic device and heating blocks, the heating blocks are of structures with tip ends, and the tip ends of the two heating blocks are respectively opposite to the welding seam;
the inflation device is positioned at the outer side of the closed container, is connected with the closed container and is used for filling protective gas into the closed container;
the vacuumizing device is positioned at the outer side of the closed container and is connected with the closed container;
the welding method of the welding device for the low-melting-point alloy comprises the following steps: respectively preprocessing the welding joints of two plates to be welded, processing the welding joints, putting the processed welding joints into a closed container, and respectively clamping one plate to be welded by using a clamping block so as to enable the welding joints of the two plates to be opposite;
vacuumizing the closed container, and filling protective gas after vacuumizing;
aligning the tip of a heating block with a welding seam, heating the welding seam by using the heating block, stopping heating the heating block after the whole welding seam area is once melted, then cooling, starting to apply pressure and keeping constant temperature after cooling to a first set temperature, cooling the welding seam area, starting to horizontally move two horizontal extrusion chucks to extrude a plate inwards, keeping for a period of time after moving, then stopping heating and extruding, and retracting;
closing the protective gas after the temperature is reduced to a certain temperature, and discharging the gas pressure;
the welding joints are processed in a step shape, the shapes of the two welding joints are mutually clamped, and the two welding joints can be mutually occluded and fastened through processing, so that the stability of mutual contact of the two welding joints is facilitated;
the vacuum degree after vacuum pumping is less than 10 millipascal;
after the protective gas is filled, the pressure of the gas in the closed container is 30-50 MPa, and the protective gas is filled to prevent the high-temperature oxidation of the plate;
the heating temperature of the heating block is 950-1050 ℃.
2. The welding device for low melting point alloy according to claim 1, characterized in that: the two horizontal extrusion chucks are respectively connected with a clamping block, and the two clamping blocks are positioned between the two horizontal extrusion chucks.
3. The welding device for low melting point alloy according to claim 2, characterized in that: the clamping blocks are adjustable in size.
4. The welding device for low melting point alloy according to claim 1, characterized in that: the heating block is a heating device with a high-frequency coil arranged inside.
5. The welding device for low melting point alloy according to claim 1, characterized in that: the heating block is in a conical structure, and the high-frequency coil is positioned on the central axis and is opposite to the welding line.
6. The welding device for low melting point alloy according to claim 1, characterized in that: a displacement sensor is arranged inside the horizontal extrusion chuck, and a first temperature sensor is arranged inside the clamping block; a pressure sensor is arranged in the vertical telescopic device, and a second temperature sensor is arranged in the heating block; an air pressure sensor is arranged in the closed container.
7. The welding device for low melting point alloy according to claim 1, characterized in that: the outer side of the closed container is provided with a master controller.
8. The welding device for low melting point alloy according to claim 6, characterized in that: the horizontal extrusion chuck, the vertical telescopic device, the heating block and the displacement sensor are respectively connected with the master controller.
9. The welding device for low melting point alloy according to claim 6, characterized in that: the first temperature sensor, the pressure sensor, the second temperature sensor and the air pressure sensor are respectively connected with the master controller.
10. The welding device for low melting point alloy according to claim 1, characterized in that: the first set temperature is 450-570 ℃, horizontal extrusion is started at the set temperature, and the pressure applied by a horizontal extrusion chuck is 5-9 MPa;
or the displacement speed of the horizontal extrusion chuck is 0.2-1 mm/s, and the unidirectional total displacement is 3-6 mm;
or the horizontal extrusion chuck keeps extrusion for 30-100 min.
11. The welding device for low melting point alloy according to claim 1, characterized in that: when the temperature is cooled to below 50 ℃, the protective gas is closed, and the gas pressure is discharged.
12. Use of a welding device for low melting point alloys according to any of claims 1 to 11 in the welding of magnesium alloys or aluminium alloys.
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| CN108746974A (en) * | 2018-05-24 | 2018-11-06 | 燕山大学 | A kind of device of pulse current auxiliary dissimilar metal tubing sensing heating weldering |
| CN109352160A (en) * | 2018-11-29 | 2019-02-19 | 太原理工大学 | A kind of preparation method of high-frequency impulse connection aluminum/magnesium alloy composite material |
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