Joint structure of composite pipe and pipe assembly

Abstract

The invention discloses a joint structure of a composite pipe and a pipe assembly. The composite pipe comprises a steel pipe body, and a copper layer is arranged on the inner surface of the steel pipebody at least. The joint structure is characterized in that the end of the joint structure sequentially comprises a bent section and a matched section from outside to inside, and the inner diameter of the bent section is larger than that of the matched section. When the composite pipe and a copper pipe are welded and assembled, the matched section of the joint structure is sleeved with the matched end of the copper pipe, the space between the inner surface of the bent section and the outer surface of the copper pipe can be filled with solder, the solder can be effectively prevented from beingin contact with the end face of the composite pipe, and therefore phosphorus in the solder is prevented from being in contact with the steel pipe body; and the phenomenon of lattice distortion due tothe fact that phosphorus is blended in a steel material in the prior art is eliminated, the toughness and plasticity of the welded composite pipe are improved, and then the use performance of the product is improved. A weld joint is formed between the copper layer and the copper pipe, when the solder is molten, the flowing property is not influenced by the steel material, good flowability can beachieved, and the forming quality of the weld joint is guaranteed.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to an interface structure and a pipe assembly of a composite pipe. Background technique [0002] In the prior art, the pipe fittings used in the refrigeration system are generally made of copper, because copper materials have good corrosion resistance and machinability, but the price of copper pipes is relatively high, and the more copper pipes are used, the more difficult the product processing will be. The higher the cost. Therefore, the interface pipe between the copper pipe and the copper pipe is usually a copper-steel composite pipe. [0003] Please refer to figure 1 , figure 1 It is a schematic diagram of assembly when welding copper pipes and copper-steel composite pipes in the prior art. [0004] The copper-steel composite pipe 1' in the prior art mainly includes a steel main pipe body and a copper layer arranged on the outer surface or / inner surface of the steel main p...

AI Technical Summary

Problems solved by technology

After the copper-steel composite pipe 1' and the copper pipe are welded with phosphor copper, the strength and hardness of the copper-steel composite pipe 1' welding section increase significantly, resulting in a significant decrease in its toughness and plasticity, which seriously affects the performance of the product

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