Welding process based on the application of busbars and copper columns in new energy vehicle charging pile plugs

Abstract

The invention discloses a welding process based on the application of a busbar and a copper column in a new energy vehicle charging pile plug, comprising the following steps: S1, setting a sandblasting machine, a cleaning device, a single-mode fiber laser and a four-axis industrial computer; S2, setting a charging pile, machining and assembling the charging pile; S3, sandblasting the welding surface of the busbar and copper column in the charging pile plug by a sandblasting machine; S4, using a cleaning device to clean the charging pile plug after sandblasting Clean the busbar and the copper column; S5, weld the busbar and the copper column in the cleaned charging pile plug by a single-mode fiber laser, and the welding process is completed in the electromechanical integrated water-cooled tooling; through the present invention The welding process welds the busbars and copper pillars in the plug of the new energy vehicle charging pile. The absorption rate of the laser can reach more than 90%, and the uniformity of the laser absorption can reach almost 100%. There is almost no oxidation, no spatter, and no melting on the surface. The pool is very deep, meeting the requirements of charging pile welding penetration, pulling force and resistivity.

Description

[0001] technology field [0002] The invention belongs to the technical field of red copper laser welding technology, and in particular relates to a welding technology based on the application of busbars and copper columns in new energy vehicle charging pile plugs. Background technique [0003] The charging pile material (pure copper C11000) has good electrical conductivity, thermal conductivity, corrosion resistance and processing performance and can be welded. There are few impurities, and a trace amount of oxygen has little effect on electrical conductivity, thermal conductivity, and processing properties, and it is easy to cause "hydrogen embrittlement", so it is not suitable for processing in reducing gases at high temperatures (such as > 370°C). Pure copper has high density, good plasticity, good processability, and excellent electrical and thermal conductivity. It is widely used in the manufacture of wires, cables, brushes, electric sparks, high-power electrical co...

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Problems solved by technology

[0004] Disadvantages of the traditional red copper welding method: 1. Oxyacetylene welding, electrode arc welding and argon arc welding, the heat conduction of welding heat is too large, the stress of the welding joint is large, the welding joint is seriously oxidized, and the external dimension is seriously deformed after welding, which cannot meet the requirements at all. The dimensional accuracy requirements of modern charging pile plugs; 2. Vacuum electron beam welding, high welding cost in vacuum and extremely low production efficiency; 3. Brazing, low efficiency, high cost, unable to guarantee product accuracy, and increased resistivity after welding It is very difficult to control the consistency of the product, and the brazing method is not allowed for electrical plugs; 4. Multi-mode continuous laser welding, spatter and heat generation during welding will cause serious oxidation of the product and uneven appearance; 5. Other types of 10000W Multi-mode fiber laser or single-mode fiber laser above 3000W integrated welding machine is expensive

[0005] Welding difficulties caused by the physical and chemical properties of copper itself: 1. Overheating oxidation: due to the good thermal conductivity of copper, it brings greater difficulties to welding and serious oxidation, which requires the use of high peak power and high energy density laser welding process ; 2. High reflectivity: the reflectivity of copper to laser is about 80-95%, and more than 90% of the energy of 1KW laser energy is reflected on the laser; 3. High thermal conductivity: the thermal conductivity of copper is large ( The thermal conductivity is 386W / m.K, which is about 7.8 times that of steel); 4. Extremely high energy density: requires extremely high energy input density. If laser welding is used, the energy density is required to be 10 8 w / cm 2 Above, and the power of the multi-mode laser should be more than 10000W; but the reflectivity of the laser is as high as 80-95% when copper is welded by laser, it is very easy to cause the irreversible burning of the fiber due to the reflection of the laser back to the fiber; 5. The uncertainty of the penetration depth : Even with laser welding, as the welding continues, the temperature of the workpiece will gradually increase during the welding process. deterministic resulting in a large amount of spatter and an uneven appearance, which creates inconsistencies in the weld pool

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