CN110091032B - Method for welding dissimilar metals of steel and copper - Google Patents
Method for welding dissimilar metals of steel and copper Download PDFInfo
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- CN110091032B CN110091032B CN201910289581.8A CN201910289581A CN110091032B CN 110091032 B CN110091032 B CN 110091032B CN 201910289581 A CN201910289581 A CN 201910289581A CN 110091032 B CN110091032 B CN 110091032B
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
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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
- 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3033—Ni as the principal constituent
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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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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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
- B23K2103/12—Copper or alloys thereof
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Abstract
The invention discloses a method for welding dissimilar metals of steel and copper, and belongs to the technical field of welding. The method comprises the following steps: respectively carrying out preheating treatment on workpieces to be welded, wherein the workpieces to be welded comprise steel workpieces and copper workpieces; and welding the welding surfaces of the steel workpiece and the copper workpiece, wherein in the welding process, the temperature difference between the steel workpiece and the copper workpiece within a target length from a welding seam is less than a target temperature, the target length is 20-30mm, and the target temperature is 20-30 ℃.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a method for welding dissimilar metals of steel and copper.
Background
Due to the melting points of steel and copper (steel melting point 1535 ℃ C., copper melting point 1083 ℃ C.), thermal conductivity (steel thermal conductivity 66.7W/(m.K), copper thermal conductivity 395.8W/(m.K)), and linear expansion coefficient (steel wire expansion coefficient 12X 10)-6(1/. degree. C.), the coefficient of expansion of the copper wire is 16.8 x 10-6(1/DEG C)), and the like, and therefore the difficulty of welding steel and copper is high, and the following problems are easily caused when the steel and the copper are welded: the heat dissipation of the copper side is fast in the welding process, and cracks are easily generated in a welding seam and a copper side fusion area.
Disclosure of Invention
In order to solve the problems in the prior art, embodiments of the present invention provide a method for welding dissimilar metals of steel and copper, which can reduce the occurrence of welding defects such as cold cracks and hot cracks. The technical scheme is as follows:
the invention provides a method for welding dissimilar metals of steel and copper, which comprises the following steps:
respectively carrying out preheating treatment on workpieces to be welded, wherein the workpieces to be welded comprise steel workpieces and copper workpieces;
and welding the welding surfaces of the steel workpiece and the copper workpiece, wherein in the welding process, the temperature difference between the steel workpiece and the copper workpiece within a target length from a welding seam is less than a target temperature, the target length is 20-30mm, and the target temperature is 20-30 ℃.
Optionally, the welding surfaces of the steel workpiece and the copper workpiece comprises:
placing the pre-heated workpieces to be welded at a target placing position, the welding surfaces of the steel workpiece and the copper workpiece are opposite, the steel workpiece and the copper workpiece are positioned on the same plane, the height of the welding surface of the copper workpiece from the horizontal plane is lower than that of the welding surface of the steel workpiece from the horizontal plane, the projection of the steel workpiece and the copper workpiece on the first vertical surface forms an included angle of 30-35 degrees with the transverse shaft, the projection of the steel workpiece and the copper workpiece on the second vertical surface forms an included angle of 30-35 degrees with the longitudinal axis, the first vertical plane is a plane passing through the transverse axis and perpendicular to the horizontal plane, the second vertical plane is a plane passing through the longitudinal axis and perpendicular to the horizontal plane, the transverse axis and the longitudinal axis are both positioned on the horizontal plane and are vertical to the longitudinal axis;
and welding the welding surfaces of the steel workpiece and the copper workpiece which are positioned at the target placing position.
Optionally, the welding surfaces of the steel workpiece and the copper workpiece comprises:
welding target welding positions in a positioning welding mode, wherein the target welding positions are positioned at two ends of the welding line;
and after the welding of the target welding position is finished, welding the welding positions except the target welding position by adopting a continuous welding mode.
Optionally, the weld comprises at least one weld layer, and the temperature between adjacent weld layers is greater than or equal to 100 ℃ during welding.
Optionally, the welding surfaces of the steel workpiece and the copper workpiece comprises:
and welding the welding surfaces of the steel workpiece and the copper workpiece by a Metal Inert Gas (MIG) welding mode.
Optionally, a welding material adopted in the MIG welding mode is a nickel-based alloy welding wire, and the mass fraction of nickel in the nickel-based alloy welding wire is greater than or equal to 93%.
Optionally, the diameter of the nickel-based alloy welding wire is 1.6mm, the welding current is 130-170A, the welding voltage is 26-30V, the welding speed is 40-50cm/min, the shielding gas is Ar, and the flow rate is 20-25 l/min.
Optionally, the respectively performing a preheating treatment on the workpieces to be welded includes:
respectively heating the steel workpiece and the copper workpiece until the temperatures of the steel workpiece and the copper workpiece reach a target preheating temperature, wherein the target preheating temperature of the steel workpiece is 100-150 ℃, and the target preheating temperature of the copper workpiece is 200-250 ℃;
and after the steel workpiece and the copper workpiece reach the target preheating temperature, preserving heat.
Optionally, the welding surfaces of the steel workpiece and the copper workpiece comprises:
cleaning the welding surfaces of the steel workpiece and the copper workpiece and impurities on the surfaces of the steel workpiece and the copper workpiece within a target length away from a welding seam;
and after the impurities are cleaned, welding the welding surfaces of the steel workpiece and the copper workpiece.
Optionally, after welding the faying surfaces of the steel and copper workpieces, the method further comprises:
and carrying out annealing heat treatment on the steel workpiece and the copper workpiece.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, in the welding process, the temperature difference between the steel workpiece and the copper workpiece within the target length away from the welding seam is controlled to be smaller than the target temperature, so that the fast heat dissipation of the copper side can be avoided, the welding defects such as cold cracks and hot cracks can be reduced when the steel and copper dissimilar metals are welded, and the welding seam quality and the welding joint strength can be ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for welding dissimilar metals of steel and copper according to an embodiment of the invention;
FIG. 2 is a flow chart of a method for welding dissimilar metals of steel and copper according to an embodiment of the invention;
fig. 3 is a schematic diagram of a target placement position according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
To facilitate understanding of the technical solutions provided by the embodiments of the present invention, a Metal Inert Gas (MIG) welding, which is abbreviated as MIG welding, is described first, and is an arc welding using argon or argon-rich Gas as a shielding medium and using an arc that is continuously fed between a meltable welding wire and a workpiece that is burned in the welding wire as a heat source.
Fig. 1 shows a method for welding dissimilar metals of steel and copper, which is provided by an embodiment of the invention, and referring to fig. 1, the flow of the method comprises the following steps.
And 101, respectively carrying out preheating treatment on workpieces to be welded.
Wherein the workpieces to be welded comprise steel workpieces and copper workpieces. Illustratively, the steel workpiece is a steel plate and the copper workpiece is a copper plate. The material of the copper workpiece can be pure copper or copper alloy. For example, the material of the copper workpiece is 20# steel, and the material of the copper workpiece is QAL9-4 aluminum bronze.
And 102, welding the welding surfaces of the steel workpiece and the copper workpiece.
In the welding process, the temperature difference between the steel workpiece and the copper workpiece within the target length of the welding seam is less than a target temperature, the target length is 20-30mm, and the target temperature is 20-30 ℃.
Illustratively, the target length is 20mm and the target temperature is 20 ℃.
According to the embodiment of the invention, in the welding process, the temperature difference between the steel workpiece and the copper workpiece within the target length away from the welding seam is controlled to be smaller than the target temperature, so that the phenomenon that the heat dissipation of the copper side is fast can be avoided, the occurrence of welding defects such as cold cracks and hot cracks during the welding of steel and copper dissimilar metals can be further reduced, and the welding seam quality and the welding joint strength are ensured.
Fig. 2 shows a method for welding dissimilar metals of steel and copper, which is provided by an embodiment of the invention, and referring to fig. 2, the flow of the method comprises the following steps.
Wherein the workpieces to be welded comprise steel workpieces and copper workpieces. In this example, it is assumed that the steel workpiece is a steel plate, the copper workpiece is a copper plate, the material of the copper workpiece is 20# steel, and the material of the copper workpiece is QAL9-4 aluminum bronze.
And step A, respectively heating the steel workpiece and the copper workpiece until the temperatures of the steel workpiece and the copper workpiece reach the target preheating temperature.
Wherein, the target preheating temperature of the steel workpiece can be 100-150 ℃, and the target preheating temperature of the copper workpiece can be 200-250 ℃.
Illustratively, the steel workpiece and the copper workpiece may be separately heat treated by a flame gun.
And step B, after the steel workpiece and the copper workpiece respectively reach the target preheating temperature, preserving heat.
Wherein, when the thickness of the steel workpiece and the copper workpiece is not more than 25mm, the heat preservation time is 0.5-1 hour.
Illustratively, during heating, the temperature of the steel and copper workpieces is measured with a contact thermometer. When the temperature of the steel side is 100-150 ℃, carrying out heat preservation treatment on the steel workpiece; and when the temperature of the copper side is 200-250 ℃, carrying out heat preservation treatment on the copper workpiece. The heat preservation time of the steel workpiece and the copper workpiece can be the same or different. It should be noted that the holding time increases with the increase of the thickness of the workpiece, and for example, the holding time is increased for 1 hour for every 25mm increase of the thickness of the workpiece on the basis of 25 mm.
Wherein, the target length can be 20-30mm, preferably 20 mm. Illustratively, the surfaces to be welded and impurities such as scale, rust, grease, water, etc. within 20mm of the weld location are carefully cleaned with a stainless steel wire wheel prior to welding.
And step 203, welding the welding surfaces of the steel workpiece and the copper workpiece after the impurities are cleaned.
Step 203 may include the following steps 2031 to 2032.
It is mentioned above that the difficulty of welding steel and copper is large because of the large difference in physical properties such as melting point, thermal conductivity, copper thermal conductivity 395.8W/(m · K)), and linear expansion coefficient between steel and copper. In addition to the fact that the weld and the copper-side fusion zone are highly susceptible to cracking, the following problems have been found in the application: liquid copper or copper alloy is reduced to free copper at high temperature, molten copper atoms are expanded along austenite grain boundaries to weaken the connection between steel grains, and copper permeates into steel, so that the copper atoms permeate the steel to cause copper brittleness and sharply weaken the strength of the steel because the melting point and the strength of the copper are much lower than those of the steel. In order to solve the problem, the embodiment of the invention adjusts the placing positions of the steel workpiece and the copper workpiece during welding, can reduce the infiltration of dissimilar elements in copper and steel (for example, the copper infiltrates into the steel), and further ensures the weld quality and the strength of a welding joint. The welding surfaces of the steel workpiece and the copper workpiece are opposite at the target placing position, the steel workpiece and the copper workpiece are located on the same plane, the height of the welding surface of the copper workpiece from the horizontal plane is lower than that of the welding surface of the steel workpiece from the horizontal plane, the included angle between the projection of the steel workpiece and the projection of the copper workpiece on the first vertical surface and the transverse shaft is 30-35 degrees, the included angle between the projection of the steel workpiece and the copper workpiece on the second vertical surface and the longitudinal shaft is 30-35 degrees, the first vertical surface is a plane passing through the transverse shaft and perpendicular to the horizontal plane, and the second vertical surface is a plane passing through the longitudinal shaft and perpendicular to the horizontal plane. The horizontal axis and the longitudinal axis are both positioned on the horizontal plane and are vertical to each other. Preferably, the projection of the steel workpiece and the copper workpiece on the first vertical surface forms an angle of 30 degrees with the transverse axis, and the projection of the steel workpiece and the copper workpiece on the second vertical surface forms an angle of 30 degrees with the longitudinal axis. Referring to fig. 3, the copper plate is T and the steel plate is G.
And in the welding process, the temperature difference between the steel workpiece and the copper workpiece within the target length of the welding seam is less than the target temperature. Illustratively, the target temperature is 20-30 ℃, preferably 20 ℃.
In the welding process, a contact type temperature measuring instrument is adopted to measure the temperature of copper and steel metal, the center and the boundary position of the copper and steel metal within the range of 20mm on two sides of a welding seam are measured, and the temperature difference is required to be less than or equal to 20 ℃. If the temperature of the copper side is reduced too fast and the temperature difference of the copper and the steel is too large, a flame gun is needed to heat the copper metal.
During welding, the welding direction may be obliquely upward (in the direction of the arrow in fig. 3), i.e., from the bottom end to the top end of the surfaces to be welded of the steel workpiece and the copper workpiece.
Wherein the number of weld layers in the weld can be more than one layer. The temperature between adjacent layers is greater than or equal to 100 c during the welding process. If the welding interruption time is long, if the interlayer temperature cannot be ensured, the workpiece needs to be preheated again.
The welding surfaces of the steel workpiece and the copper workpiece can be welded by MIG welding. Exemplary process parameters for MIG welding are described in detail below.
Illustratively, the welding material adopted by the MIG welding mode is a nickel-based alloy welding wire, and the mass fraction of nickel can be greater than or equal to 93%. Practice proves that when the welding material is used for welding copper-steel bimetal, the infiltration of dissimilar elements can be avoided. For example, the nickel-based alloy wire may be ERNi-1 in grade, 1.6mm in diameter, and the composition and mass fraction ratio (% by mass) of the wire are shown in Table 1 below. Referring to Table 1, the nickel-based alloy welding wire includes 10 components, C, Cu, Mn, Fe, Ni, Al, Ti, Si, P, and S. In the nickel-based alloy welding wire, the mass fraction of C is less than or equal to 0.15, the mass fraction of Cu is less than or equal to 0.25, the mass fraction of Mn is less than or equal to 1, the mass fraction of Fe is less than or equal to 1, the mass fraction of Ni is more than or equal to 93, the mass fraction of Al is less than or equal to 1.5, the mass fraction of Ti is 2-3.5, the mass fraction of Si is less than or equal to 0.75, the mass fraction of P is less than or equal to 0.03, and the mass fraction of S is less.
TABLE 1
Illustratively, when the diameter of the nickel-based alloy welding wire is 1.6mm, the welding current is 130-170A, the welding voltage is 26-30V, the welding speed is 40-50cm/min, the shielding gas is Ar, and the flow rate is 20-25 l/min. Wherein the weld may comprise at least one weld layer. The number of weld layers is determined by the thickness of the steel and copper workpieces. When the thicknesses of the steel workpiece and the copper workpiece are both thicker, a plurality of welding layers can be arranged, for example, 3 welding layers; when the thicknesses of the steel workpiece and the copper workpiece are both relatively thin, 1 welding layer can be arranged.
TABLE 2
Referring to table 2, the welding parameters for the 3 layers are listed. The welding current of the layer 1 welding layer is 130-150A, and the welding voltage is 26-28V; the welding current of the 2 nd-3 rd welding layer is 150-170A, and the welding voltage is 26-30V. Under the process parameters, the infiltration of dissimilar elements during the welding of copper steel dissimilar metals can be reduced.
Illustratively, step 2032 may comprise the following steps.
Firstly, welding a target welding position by adopting a positioning welding mode.
Wherein the target welding positions are located at both ends of the weld. The weld is the entire weld on the weld face of the steel and copper workpieces. Illustratively, the weld length at the target weld location may be 30-40 mm. Referring to fig. 3, the target weld location is shown as a black filled block. If there is a defect such as a crack, a gas hole, or slag inclusion in the tack weld, the tack weld should be completely removed.
And secondly, after the welding of the target welding position is finished, welding the welding positions except the target welding position by adopting a continuous welding mode.
And the workpiece placing position during continuous welding is the same as the position during positioning welding and is at the target placing position. In the case of continuous welding, the arc must be deflected to the steel side. Illustratively, the arc is directed to one side of the steel workpiece.
And 204, after welding is finished, annealing heat treatment is carried out on the steel workpiece and the copper workpiece.
And after the welding is finished, carrying out annealing heat treatment on the workpiece. Illustratively, the initial furnace temperature of the heat treatment is 100-150 ℃, the temperature is gradually increased to 300-400 ℃, then the temperature is kept for 2-2.5 hours, then the temperature is increased to 500-. The annealing heat treatment process is applied to a case where the workpiece thickness is 25mm or less. When the thickness of the workpiece is increased by 25mm, the heat preservation time is increased by 1 hour.
According to the embodiment of the invention, in the welding process, the temperature difference between the steel workpiece and the copper workpiece within the target length away from the welding seam is controlled to be smaller than the target temperature, so that the phenomenon that the heat dissipation of the copper side is fast can be avoided, the occurrence of welding defects such as cold cracks and hot cracks during the welding of steel and copper dissimilar metals can be further reduced, and the welding seam quality and the welding joint strength are ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for welding dissimilar metals of steel and copper, the method comprising:
respectively carrying out preheating treatment on workpieces to be welded, wherein the workpieces to be welded comprise steel workpieces and copper workpieces;
welding the welding surfaces of the steel workpiece and the copper workpiece, wherein in the welding process, the temperature difference between the steel workpiece and the copper workpiece within a target length from a welding seam is less than a target temperature, the target length is 20-30mm, and the target temperature is any temperature value between 20-30 ℃;
the welding of the welding surfaces of the steel workpiece and the copper workpiece comprises:
placing the pre-heated workpieces to be welded at a target placing position, the welding surfaces of the steel workpiece and the copper workpiece are opposite, the steel workpiece and the copper workpiece are positioned on the same plane, the height of the welding surface of the copper workpiece from the horizontal plane is lower than that of the welding surface of the steel workpiece from the horizontal plane, the projection of the steel workpiece and the copper workpiece on the first vertical surface forms an included angle of 30-35 degrees with the transverse shaft, the projection of the steel workpiece and the copper workpiece on the second vertical surface forms an included angle of 30-35 degrees with the longitudinal axis, the first vertical plane is a plane passing through the transverse axis and perpendicular to the horizontal plane, the second vertical plane is a plane passing through the longitudinal axis and perpendicular to the horizontal plane, the transverse axis and the longitudinal axis are both positioned on the horizontal plane and are vertical to the longitudinal axis;
and welding the welding surfaces of the steel workpiece and the copper workpiece which are positioned at the target placing position.
2. The method of claim 1, wherein said welding the faying surfaces of the steel and copper workpieces comprises:
welding target welding positions in a positioning welding mode, wherein the target welding positions are positioned at two ends of the welding line;
and after the welding of the target welding position is finished, welding the welding positions except the target welding position by adopting a continuous welding mode.
3. The method of claim 1, wherein said weld comprises at least one weld layer, and wherein the temperature between adjacent said weld layers is greater than or equal to 100 ℃ during welding.
4. The method of claim 3, wherein said welding the faying surfaces of the steel and copper workpieces comprises:
and welding the welding surfaces of the steel workpiece and the copper workpiece by a Metal Inert Gas (MIG) welding mode.
5. The method of claim 4 wherein the MIG welding process uses a nickel-based alloy wire having a nickel content greater than or equal to 93 wt%.
6. The method as claimed in claim 5, wherein the diameter of the nickel-based alloy welding wire is 1.6mm, the welding current is 130-170A, the welding voltage is 26-30V, the welding speed is 40-50cm/min, the shielding gas is Ar, and the flow rate is 20-25 l/min.
7. The method of claim 1, wherein the separately pre-heating the workpieces to be welded comprises:
respectively heating the steel workpiece and the copper workpiece until the temperatures of the steel workpiece and the copper workpiece reach a target preheating temperature, wherein the target preheating temperature of the steel workpiece is 100-150 ℃, and the target preheating temperature of the copper workpiece is 200-250 ℃;
and after the steel workpiece and the copper workpiece reach the target preheating temperature, preserving heat.
8. The method of claim 1, wherein said welding the faying surfaces of the steel and copper workpieces comprises:
cleaning the welding surfaces of the steel workpiece and the copper workpiece and impurities on the surfaces of the steel workpiece and the copper workpiece within a target length away from a welding seam;
and after the impurities are cleaned, welding the welding surfaces of the steel workpiece and the copper workpiece.
9. The method of claim 1, wherein after welding the faying surfaces of the steel and copper workpieces, the method further comprises:
and carrying out annealing heat treatment on the steel workpiece and the copper workpiece.
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| CN111168204A (en) * | 2020-02-12 | 2020-05-19 | 西安理工大学 | Copper-steel dissimilar metal welding method with preset nickel sheets |
| CN112872556A (en) * | 2021-01-23 | 2021-06-01 | 天津工业大学 | Excitation device for applying external transverse magnetic field to dissimilar steel welding |
| CN113399937A (en) * | 2021-05-14 | 2021-09-17 | 西安理工大学 | Copper/steel bimetal composite structural member combined with heat treatment process and preparation method thereof |
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