Device used for welding copper tube and aluminum tube in refrigeration equipment and welding method thereof

Abstract

The invention discloses a device used for welding a copper tube and an aluminum tube in refrigeration equipment and a welding method of the device. The device comprises a main device body and a working table, wherein the main device body comprises a main box, an alternating-current power source, a transformer, a high-voltage rectifier, a capacitor set, vacuum switches and a triggering device; the working table comprises a rack and a welding head, the welding head comprises an electric conducting coil and a magnetic flux concentrator, and the electric conduction coil is connected with all the vacuum switches through coaxial cables. The welding method includes the following steps that (1), one end of an outer tube is inserted in the magnetic flux concentrator, and one end of an inner tube is inserted into the magnetic flux concentrator; (2), a pulser is started, when a charging voltage reaches a set value, the system control triggering device turns on a discharging switch, and the outer tube and the inner tube are welded through magnetic force in the magnetic flux concentrator. The device used for welding the copper tube and the aluminum tube in the refrigeration equipment achieves normal-temperature welding, and is more convenient and faster to use, more environmentally friendly and lower in welding cost.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a device for welding copper pipes and aluminum pipes in refrigeration equipment and a welding method thereof. Background technique [0002] With the impact of rising copper prices and the demand for lightweight products, "aluminum instead of copper" has become an important trend in the manufacture of product parts. This requires that the copper material and the aluminum material be connected into one body through a welding process, which is called copper-aluminum welding. However, both copper and aluminum are easy-to-oxidize metals with poor weldability. It is very difficult to achieve a good welding effect on the dissimilar metals of copper and aluminum. Therefore, copper-aluminum welding has always been an international welding problem. There are following deficiencies in existing welding technology: [0003] 1. Copper-aluminum welding Traditionally, the method of hang...

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Problems solved by technology

[0003]1. Copper-aluminum welding is traditionally used to weld copper and aluminum by hanging tin and melting tin. This method does not form well and does not have good strength. It has a low melting point and cannot be welded to workpieces working at high temperatures, so this process is only suitable for use on small workpieces under normal temperature conditions, and it is difficult to apply it to the production of other products

[0004]2. Welding copper and aluminum by heat fusion welding, friction welding, electron beam welding, ultrasonic welding and other welding methods will cause residual stress and deformation due to uneven temperature field The welded joints are brittle and prone to cracks, and the welds are prone to pores. The welded workpieces will inevitably break. After the breakage, the conductor may be disconnected and the pipeline may leak, so it often does not meet the actual requirements. The effect required in production

[0006] But this method also has defects: First, the formation of the weld seam is a process in which the molten solder flows and fills the entire weld seam gap by the siphon principle, which is affected by the material and Influenced by the process and the cleanliness of the material surface, there will always be flux film rupture and poor cleaning effect, resulting in uneven filling of the solder, affecting the uniformity of the joint, and there will be more defects (such as pores, solidification cracks, etc.) etc.), so that welding defects such as weld air tightness index and weld strength index are not up to standard, directly affect the quality and life of weldment

[0007] In addition, the production environment of the traditional process is harsh, the fire hazard is great, and it is unsafe; the labor intensity of the workers is high, and the welding efficiency is low; the welding quality is unstable and the appearance of the joint is not beautiful; the welding process produces high temperature, heat, smoke, exhaust gas, etc. Negative impact on the environment

[0008] Furthermore, due to the large consumption of flux, solder and other auxiliary materials, as well as high energy consumption, the welding cost of this traditional welding method is relatively high

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