CN111673239B - Copper/steel composite material connecting method for preset joint - Google Patents

Copper/steel composite material connecting method for preset joint Download PDF

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CN111673239B
CN111673239B CN202010430764.XA CN202010430764A CN111673239B CN 111673239 B CN111673239 B CN 111673239B CN 202010430764 A CN202010430764 A CN 202010430764A CN 111673239 B CN111673239 B CN 111673239B
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welding
copper
steel
preset joint
test plate
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CN111673239A (en
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张敏
杜明科
张云龙
李静
董玉凡
苟川东
王博玉
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Xian University of Technology
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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
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
    • B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
    • 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
    • B23K9/04—Welding for other purposes than joining, e.g. built-up welding
    • B23K9/044—Built-up welding on three-dimensional surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention discloses a copper/steel composite material connecting method of a preset joint, which comprises the following specific operation steps: step 1: preparing a copper steel preset joint: preparing a copper-steel composite welding seam with a reasonable specification by using an electric arc additive technology to serve as a preset joint; and 2, step: and selecting solid welding wires with the same components according to the components of the base metal, and completing the welding of the copper test plate, the steel test plate and the copper steel preset joint by adopting gas metal arc welding. The method can improve the welding quality and the comprehensive mechanical property of the copper-steel dissimilar metal welding joint, and provides a brand new thought for the connection of copper/steel dissimilar metals.

Description

Copper/steel composite material connecting method for preset joint
Technical Field
The invention belongs to the technical field of dissimilar metal welding, and particularly relates to a method for connecting a copper/steel composite material of a preset joint.
Background
In the field of industrial manufacturing, a welding structure made of a single metal cannot meet the use requirements, and therefore, in order to ensure the use performance of the welding structure, a composite material is used to replace the single material in most cases, so that the requirements of both economic benefit and structural strength are met. In the field of manufacturing large transformer oil tanks, copper-steel dissimilar metals are almost all used for welding, and the structure has the advantages of shielding an external magnetic field, increasing the heat dissipation speed, ensuring the strength of a tank body and the like.
However, the welding difficulty of copper-steel dissimilar metals is large. This is because the two metals have large differences in their physicochemical properties, and thus, many welding defects such as unfused, blowholes, and permeation cracks are generated during welding. In which the penetration cracks formed on the steel side reduce the strength of the joint and over time the cracks may propagate and extend throughout the welded joint, causing the welded structure to fail. Therefore, a reasonable joint transition form must be designed, and a reasonable welding process is selected to prevent various welding defects generated in the copper-steel welding process as much as possible, so that the comprehensive mechanical property of the structural member is improved.
Disclosure of Invention
The invention aims to provide a copper/steel composite material connecting method for a preset joint, which can improve the welding quality and the comprehensive mechanical property of a copper-steel dissimilar metal welding joint.
The invention adopts the technical scheme that a copper/steel composite material connecting method of a preset joint comprises the following specific operation steps:
step 1: preparing a copper steel preset joint: preparing a copper-steel composite welding seam with a reasonable specification by using an electric arc additive technology to serve as a preset joint;
step 2: and selecting solid welding wires with the same components according to the components of the base metal, and completing the welding of the copper test plate, the steel test plate and the copper steel preset joint by adopting gas metal arc welding.
The present invention is also characterized in that,
in the step 1, the preparation materials of the copper steel preset joint are a CHW50C6 carbon steel welding wire and an S211 silicon bronze welding wire with the diameter of 1.2 mm; the specific preparation parameters of the copper steel preset joint are as follows: firstly, steel side: welding current is 190~210A, welding voltage 21~24V, welding speed 5~8mm/s, and protective gas is: volume fraction of 90% Ar + volume fraction of 10% CO2The volume percentage sum of the components is 100%, and the gas flow is 15-18L/min; copper side: the welding current is 210-240A, the welding voltage is 22-26V, the welding speed is 4-6 mm/s, the inert protective gas is pure argon with the volume percentage of 99.99%, and the flow rate is 15-18L/min.
In the step 1, the specification of the copper steel preset joint prepared by the electric arc additive technology is as follows: the length is 100mm × 5-8 mm × 5 mm.
In the step 2, the copper test plate is a T2-Y red copper plate, and the steel test plate is a Q345B plate; the specifications of the copper test plate and the steel test plate are as follows: length × width × height is 100mm × 50mm × 5 mm.
In the step 2, the adopted solid welding wires are S201 red copper welding wires and CHW50C6 carbon steel welding wires respectively, and the specifications of the welding wires are phi 1.2 mm.
In the step 2, the welding technological parameters of the copper steel preset joint and the test plate are as follows: welding a Q345B test plate with a preset joint: welding current is 200~225A, welding voltage 22~25V, welding speed 5~8mm/s, and protective gas is: volume fraction of 90% Ar + volume fraction of 10% CO2The volume percentage sum of the components is 100%, and the gas flow is 15-18L/min; welding the T2-Y red copper test plate and the copper steel preset joint: the welding current is 220-245A, the welding voltage is 23-27V, the welding speed is 4-6 mm/s, the inert protective gas is pure argon with the volume percentage of 99.99%, and the flow is 15-18L/min.
The invention has the beneficial effects that:
1. the method of the invention adopts the preset joint to replace the traditional welding line, realizes the conversion from heterogeneous welding to homogeneous welding and reduces the welding difficulty.
2. The method of the invention utilizes the electric arc material increase technology to prepare the preset joint, and the latter layer of welding bead is equivalent to the former layer of welding bead which is subjected to heat treatment, so that the comprehensive mechanical property of the whole welding joint is improved.
3. The method can reduce the probability of welding defects caused by the difference of the thermal physical properties of dissimilar materials.
4. The method does not need to preheat the T2-Y copper plate before welding, thereby improving the welding efficiency.
Drawings
FIG. 1 is a schematic view of the assembly and welding of a test plate and a preset joint.
FIG. 2 is a schematic view of a stretch break in example 3 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a copper/steel composite material connecting method of a preset joint, which comprises the following specific operation steps as shown in figure 1:
step 1: preparing a copper steel preset joint: preparing a copper-steel composite welding seam with a reasonable specification by using an electric arc additive technology to serve as a preset joint;
in the step 1, the preparation materials of the copper steel preset joint are a CHW50C6 carbon steel welding wire and an S211 silicon bronze welding wire with the diameter of 1.2 mm; the specific preparation parameters of the copper steel preset joint are as follows: firstly, steel side: welding current is 190~210A, welding voltage 21~24V, welding speed 5~8mm/s, and protective gas is: volume fraction of 90% Ar + volume fraction of 10% CO2The volume percentage sum of the components is 100%, and the gas flow is 15-18L/min; copper side: the welding current is 210-240A, the welding voltage is 22-26V, the welding speed is 4-6 mm/s, the inert protective gas is pure argon with the volume percentage of 99.99%, and the flow rate is 15-18L/min;
in the step 1, the specification of the copper steel preset joint prepared by the electric arc additive technology is as follows: the length is 100mm × 5-8 mm × 5 mm.
In the step 1, surfacing three layers of each material, and mechanically polishing and cleaning each layer of welding bead in the material increasing process to prevent impurities;
step 2: selecting solid welding wires with the same components according to the components of the base metal, and completing the welding of a copper test plate, a steel test plate and a copper steel preset joint by adopting gas metal arc welding;
in the step 2, the copper test plate is a T2-Y red copper plate, and the steel test plate is a Q345B plate; the specifications of the copper test plate and the steel test plate are as follows: length × width × height ═ 100mm × 50mm × 5 mm;
in step 2, the T2-Y red copper and Q345B test plates must be cleaned before welding.
In the step 2, the adopted solid welding wires are S201 red copper welding wires and CHW50C6 carbon steel welding wires respectively, and the specifications of the welding wires are phi 1.2 mm;
in step 2, welding process parameters of copper steel preset joint and test plateThe number is as follows: welding a Q345B test plate with a preset joint: welding current is 200~225A, welding voltage 22~25V, welding speed 5~8mm/s, and protective gas is: volume fraction of 90% Ar + volume fraction of 10% CO2The volume percentage sum of the components is 100%, and the gas flow is 15-18L/min; welding the T2-Y red copper test plate and the copper steel preset joint: the welding current is 220-245A, the welding voltage is 23-27V, the welding speed is 4-6 mm/s, the inert protective gas is pure argon with the volume percentage of 99.99%, and the flow rate is 15-18L/min.
In examples 1 to 5, the test pieces Q345B and T2-Y were each 100X 50X 5mm in size.
Example 1
Step 1, preparing a preset joint by adopting a CHW50C6 carbon steel welding wire with the diameter of 1.2mm and an S211 silicon bronze welding wire. The additive preparation of the preset joint is completed by using a welding robot, the specification of the joint is 100 multiplied by 5mm, three layers of materials are overlaid, and each welding pass is polished by a steel wire brush to prevent impurities. The specific additive preparation parameters are as follows: firstly, preparing a steel side preset joint: the welding current is 190A, the welding voltage is 21V, the welding speed is 5mm/s, the volume fraction is 90 percent Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 15L/min; preparing a copper side preset joint: the welding current is 210A, the welding voltage is 22V, the welding speed is 4mm/s, the inert protective gas is pure argon with the volume ratio of 99.99%, and the flow is 15L/min.
And 2, cleaning the test plate before welding, including mechanical polishing and acetone or alcohol cleaning. Then, an S201 red copper welding wire with the diameter of 1.2mm and a CHW50C6 carbon steel welding wire are selected as welding seam filling metals, the preset joint is connected with a Q345B and a T2-Y red copper test plate by adopting gas metal arc welding, and the specifications of the two plates are both 100 multiplied by 50 multiplied by 5 mm. The specific parameters of the welding process are as follows: connecting a Q345B test board with a preset joint: the welding current is 200A, the welding voltage is 22V, the welding speed is 5mm/s, the volume fraction is 90 percent Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 15L/min; connecting the T2-Y copper test board with a preset joint:the welding current is 220A, the welding voltage is 23V, the welding speed is 4mm/s, the inert protective gas is pure argon with the volume percentage of 99.99 percent, and the flow is 15L/min.
In the welding joint prepared by the method for connecting the copper/steel composite material of the preset joint in the embodiment 1, the mechanical property detection shows that the tensile strength is 208MPa, the welding joint is partially broken in a heat affected zone of a T2-Y copper test plate, and the elongation after breakage is 11.6%.
Example 2
Step 1, preparing a preset joint by adopting a CHW50C6 carbon steel welding wire with the diameter of 1.2mm and an S211 silicon bronze welding wire. The additive preparation of the preset joint is completed by using a welding robot, the specification of the joint is 100 multiplied by 5.5 multiplied by 5mm, three layers of materials are overlaid, each layer of welding bead is ground by a steel wire brush, and the inclusion is prevented. The specific additive preparation parameters are as follows: firstly, preparing a steel side preset joint: the welding current is 200A, the welding voltage is 22V, the welding speed is 5.5mm/s, the volume fraction is 90 percent, Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 16L/min; preparing a copper side preset joint: the welding current is 220A, the welding voltage is 23V, the welding speed is 4.5mm/s, the inert protective gas is pure argon with the volume percentage of 99.99 percent, and the flow is 16L/min.
And 2, cleaning the test plate before welding, including mechanical polishing and acetone or alcohol cleaning. Then, an S201 red copper welding wire with the diameter of 1.2mm and a CHW50C6 carbon steel welding wire are selected as welding seam filling metals, the preset joint is connected with a Q345B and a T2-Y red copper test plate by adopting gas metal arc welding, and the specifications of the two plates are both 100 multiplied by 50 multiplied by 5 mm. The specific parameters of the welding process are as follows: connecting a Q345B test board with a preset joint: the welding current is 210A, the welding voltage is 22.5V, the welding speed is 5.5mm/s, the volume fraction is 90 percent, Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 16L/min; connecting the T2-Y copper test board with a preset joint: the welding current is 230A, the welding voltage is 24.5V, the welding speed is 4.5mm/s, the inert protective gas is pure argon with the volume percentage of 99.99 percent, and the flow is 16L/min.
In the welding joint prepared by the method for connecting the copper/steel composite material of the preset joint in the embodiment 2, the mechanical property detection shows that the tensile strength is 188MPa, the joint strength is reduced due to inclusion in the preset joint, the copper side of the preset joint is broken in the stretching process, and the elongation after breakage is 9%.
Example 3
Step 1, preparing a preset joint by adopting a CHW50C6 carbon steel welding wire with the diameter of 1.2mm and an S211 silicon bronze welding wire. The additive manufacturing of the preset joint is completed by using a welding robot, the specification of the joint is 100 multiplied by 6.5 multiplied by 5mm, each material is overlaid for three layers, each welding pass is polished by a steel wire brush, and the inclusion is prevented. The specific additive preparation parameters are as follows: firstly, preparing a steel side preset joint: the welding current is 205A, the welding voltage is 23.5V, the welding speed is 6.5mm/s, the volume fraction is 90 percent, Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 16L/min; preparing a copper side preset joint: the welding current is 235A, the welding voltage is 25V, the welding speed is 5mm/s, the inert protective gas is pure argon with the volume percentage of 99.99 percent, and the flow is 16L/min.
And 2, cleaning the test plate before welding, including mechanical polishing and acetone or alcohol cleaning. Then, an S201 red copper welding wire with the diameter of 1.2mm and a CHW50C6 carbon steel welding wire are selected as welding seam filling metals, the preset joint is connected with a Q345B and a T2-Y red copper test plate by adopting gas metal arc welding, and the specifications of the two plates are both 100 multiplied by 50 multiplied by 5 mm. The specific parameters of the welding process are as follows: connecting a Q345B test board with a preset joint: the welding current is 215A, the welding voltage is 23V, the welding speed is 6.5mm/s, the volume fraction is 90 percent, Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 16L/min; connecting the T2-Y copper test board with a preset joint: the welding current is 235A, the welding voltage is 25V, the welding speed is 5mm/s, the inert protective gas is pure argon with the volume percentage of 99.99 percent, and the flow is 16L/min.
In combination with the microscopic diagram of the fracture shown in fig. 2, it can be seen that no welding defects such as pores and microcracks are found at the fracture, and a large number of shallow dimples exist, which belong to typical ductile fracture.
In example 3, the welded joint prepared by the method for connecting copper/steel composite materials with the preset joint has tensile strength of 239MPa through mechanical property detection, is broken in a welding heat affected zone of a T2-Y red copper test plate, and has an elongation percentage after breakage of 14.2%.
Example 4
Step 1, preparing a preset joint by adopting a CHW50C6 carbon steel welding wire with the diameter of 1.2mm and an S211 silicon bronze welding wire. The additive preparation of the preset joint is completed by using a welding robot, the specification of the joint is 100 multiplied by 8 multiplied by 5mm, three layers of materials are overlaid, and each welding pass is polished by a steel wire brush to prevent impurities. The specific additive preparation parameters are as follows: firstly, preparing a steel side preset joint: the welding current is 210A, the welding voltage is 24V, the welding speed is 8mm/s, the volume fraction is 90 percent Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 18L/min; preparing a copper side preset joint: the welding current is 240A, the welding voltage is 26V, the welding speed is 6mm/s, the inert protective gas is pure argon with the volume percentage of 99.99 percent, and the flow is 18L/min.
And 2, cleaning the test plate before welding, including mechanical polishing and acetone or alcohol cleaning. Then, an S201 red copper welding wire with the diameter of 1.2mm and a CHW50C6 carbon steel welding wire are selected as welding seam filling metals, the preset joint is connected with a Q345B and a T2-Y red copper test plate by adopting gas metal arc welding, and the specifications of the two plates are both 100 multiplied by 50 multiplied by 5 mm. The specific parameters of the welding process are as follows: connecting a Q345B test board with a preset joint: the welding current is 225A, the welding voltage is 25V, the welding speed is 8mm/s, the volume fraction is 90 percent Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 18L/min; connecting the T2-Y copper test board with a preset joint: the welding current is 245A, the welding voltage is 27V, the welding speed is 6mm/s, the inert protective gas is pure argon with the volume percentage of 99.99 percent, and the flow is 18L/min.
In example 4, the welded joint prepared by the method for connecting copper/steel composite materials with a preset joint has a tensile strength of 228MPa, and is broken in a heat affected zone of a T2-Y red copper test plate, and the elongation after breakage is 12.1% by mechanical property detection.
Example 5
Step 1, preparing a preset joint by adopting a CHW50C6 carbon steel welding wire with the diameter of 1.2mm and an S211 silicon bronze welding wire. The additive preparation of the preset joint is completed by using a welding robot, the specification of the joint is 100 multiplied by 7 multiplied by 5mm, three layers of materials are overlaid, and each welding pass is polished by a steel wire brush to prevent impurities. The specific additive preparation parameters are as follows: firstly, preparing a steel side preset joint: the welding current is 200A, the welding voltage is 24V, the welding speed is 8mm/s, the volume fraction is 90 percent Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 18L/min; preparing a copper side preset joint: the welding current is 240A, the welding voltage is 26V, the welding speed is 6mm/s, the inert protective gas is pure argon with the volume percentage of 99.99 percent, and the flow is 18L/min.
And 2, cleaning the test plate before welding, including mechanical polishing and acetone or alcohol cleaning. Then, an S201 red copper welding wire with the diameter of 1.2mm and a CHW50C6 carbon steel welding wire are selected as welding seam filling metals, the preset joint is connected with a Q345B and a T2-Y red copper test plate by adopting gas metal arc welding, and the specifications of the two plates are both 100 multiplied by 50 multiplied by 5 mm. The specific parameters of the welding process are as follows: connecting a Q345B test board with a preset joint: the welding current is 220A, the welding voltage is 25V, the welding speed is 8mm/s, the volume fraction is 90 percent Ar + the volume fraction is 10 percent CO2The volume percentage sum of the components is 100%, and the gas flow is 18L/min; connecting the T2-Y copper test board with a preset joint: the welding current is 245A, the welding voltage is 27V, the welding speed is 6mm/s, the inert protective gas is pure argon with the volume percentage of 99.99 percent, and the flow is 18L/min.
In example 5, the welded joint prepared by the method for connecting the copper/steel composite material with the preset joint has a tensile strength of 220MPa, and is fractured in a heat affected zone of a T2-Y red copper test plate, and the elongation after fracture is 11.8% according to mechanical property detection.
The comparison of five groups of tests shows that the welded joint prepared by the method for connecting the copper/steel composite material of the preset joint has good weld surface forming and no obvious cracks and inclusions. Due to the fact that conversion from heterogeneous material connection to homogeneous material connection is achieved, welding defects such as permeation cracks, air holes and incomplete fusion are avoided, and mechanical properties of all aspects of a welding joint are greatly improved compared with direct welding of a copper steel test plate.
The mechanical properties of the weld joints prepared in the five examples are shown in table 1.
Table 1 examples 1-5 weld joint mechanical properties
Numbering Tensile strength/MPa Elongation after rupture/%)
Example 1 208 11.6
Example 2 188 9
Example 3 239 14.2
Example 4 228 12.1
Example 5 220 11.8

Claims (4)

1. A method for connecting copper/steel composite materials of preset joints is characterized by comprising the following specific operation steps:
step 1: preparing a copper steel preset joint: preparing a copper-steel composite welding seam with a reasonable specification by using an electric arc additive technology to serve as a preset joint;
step 2: welding a copper test plate, a steel test plate and a copper steel preset joint by adopting gas metal arc welding, wherein the copper side of the copper steel preset joint is used for welding the copper test plate, and the steel side of the copper steel preset joint is used for welding the steel test plate;
in the step 1, the preparation materials of the copper steel preset joint are a CHW50C6 carbon steel welding wire and an S211 silicon bronze welding wire with the diameter of 1.2 mm; the specific preparation parameters of the copper steel preset joint are as follows: firstly, steel side: welding current is 190~210A, welding voltage 21~24V, welding speed 5~8mm/s, and protective gas is: volume fraction of 90% Ar + volume fraction of 10% CO2The volume percentage sum of the components is 100%, and the gas flow is 15-18L/min; copper side: the welding current is 210-240A, the welding voltage is 22-26V, the welding speed is 4-6 mm/s, the inert protective gas is pure argon with the volume percentage of 99.99%, and the flow rate is 15-18L/min;
in the step 2, the welding technological parameters of the copper steel preset joint and the test plate are as follows: welding a steel test plate and a preset joint: the steel test plate is a Q345B plate, the adopted welding wire is a CHW50C6 carbon steel solid welding wire, the welding current is 200-225A, the welding voltage is 22-25V, the welding speed is 5-8 mm/s, and the protective gas is as follows: volume fraction of 90% Ar + volume fraction of 10% CO2The volume percentage sum of the components is 100%, and the gas flow is 15-18L/min; welding the copper test plate and the copper steel preset joint: the copper test plate is a T2-Y red copper plate; the method adopts S201 red copper solid welding wire as welding wire, welding current is 220-245A, welding voltage is 23-27V, welding speed is 4-6 mm/S, inert protective gas is pure argon with volume percentage of 99.99 percentThe flow rate is 15-18L/min.
2. The method for connecting the copper/steel composite materials of the preset joints according to claim 1, wherein in the step 1, the specifications of the copper-steel preset joint prepared by using the arc additive technology are as follows: the length x width x height =100mm x 5-8 mm x 5 mm.
3. The method for connecting the copper/steel composite material of the preset joint as claimed in claim 1, wherein in the step 2, the specifications of the copper test plate and the steel test plate are as follows: length × width × height =100mm × 50mm × 5 mm.
4. The method for connecting the copper/steel composite material of the preset joint as claimed in claim 3, wherein in the step 2, the specifications of the S201 red copper solid welding wire and the CHW50C6 carbon steel solid welding wire are both phi 1.2 mm.
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