A method of cladding tungsten copper on copper surface based on arc additive material
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A copper surface and arc technology, applied in the field of tungsten copper cladding, can solve the problems of easy oxidation of copper alloys, preparation of coatings, high thermal conductivity, and achieve the effects of good electrical conductivity and high forming efficiency of parts
Active Publication Date: 2020-01-31
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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[0004] Aiming at the current problems in cladding tungsten-copper on the surface of copper substrates that laser is difficult to prepare coatings on copper surfaces, copper alloys are easy to oxidize, and have high thermal conductivity, the present invention provides a method for cladding tungsten-copper on copper surfaces based on arc additive materials
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Embodiment 1
[0030] Example 1 Preparation of flux-cored welding wire.
[0031] Prepare flux-cored welding wire according to the formula in Table 1, and the specific preparation method is as follows:
[0032] a) Weigh the drug core components in proportion, then dry, sieve, and mix powder;
[0033] b) The copper strip is first cleaned and dried, and then processed into U-line grooves;
[0034] c) Fill the powder into the U-shaped groove copper strip according to a certain filling rate, and then roll it into a tubular welding wire by a closed forming roll;
[0035] d) The tubular welding wire is sent into the wire drawing machine, and the welding wire with a diameter of 2.0mm is obtained through drawing processing.
[0036] Table 1 welding wire formula
[0037]
Embodiment 2
[0038] Example 2 Preparation of a copper material whose surface is clad with tungsten copper.
[0039] According to the parameters in Table 2, tungsten copper is clad on the surface of copper material by arc additive material, and the products S1-S4 are obtained. The specific operation is as follows:
[0040] (1) Choose red copper as the base material, place the copper alloy sample in a closed argon-filled device, the pressure inside the device is 0.105MPa, and it has the function of continuous gas exchange, and the purity of the argon gas used is 99.99%; warm up;
[0041] (2) Adopt multi-layer and multi-channel tungsten argon arc welding, direct current connection, tungsten electrode diameter is 2.5mm, argon gas purity is 99.99%, set argon gas flow, welding current, welding speed, wire feeding speed, tungsten electrode distance.
[0042] Table 2 Parameter setting of arc additive
[0043] .
[0044] The thickness of the tungsten-copper layer of the obtained material is me...
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Abstract
The invention provides a method for cladding tungsten copper on the copper surface based on electric arc additive manufacturing. The method comprises the following steps of heating and conducting heatpreservation on a copper base body in a ventilative closed container under argon shielding; and conducting electric arc additive manufacturing surfacing direct current electrode negative argon tungsten-arc welding. According to the method, a welding wire is formed by wrapping a copper skin outside a flux core; the flux core comprises copper powder, tungsten powder, boron powder and silicon powder, and the filling rate of the flux core is 30-80%. The thickness of a tungsten copper layer of the surface of the material prepared through the method is not less than 1.5mm. The material can be applied to the electric contact surface of electrical equipment. Through the method, the forming efficiency of a component is high; the thickness of the prepared cladding layer can be from the millimeter scale to the centimeter scale, and the range of the thickness of the prepared cladding layer is large; and moreover, technological parameters can be adjusted according to the shape of the component toachieve the purpose of rapid response to manufacturing. The material prepared through method integrates the good electrical conductivity of copper alloy and the arc ablation resistance and is wide inapplication range.
Description
technical field [0001] The invention relates to the technical field of alloy material preparation, in particular to a method for cladding tungsten copper on the surface of a copper substrate by using an arc additive method. Background technique [0002] Metal copper has high electrical and thermal conductivity second only to silver, and at the same time has suitable strength, excellent corrosion resistance, easy brazing and deformation processing, and has a wide range of applications in electrical equipment and other fields. However, pure copper has poor welding resistance and arc erosion resistance, and it is often difficult to meet the performance requirements of pure copper alone in electrical contact devices. W-Cu alloy is a kind of metal composite material. According to the alloy phase diagram of W-Cu, it can be seen that the two metals are neither solid solution nor intermetallic compound, and what is formed is a pseudo-alloy in which W and Cu are separated. . This c...
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