a pipe assembly

Abstract

A connection structure of a composite pipe and a pipe assembly are provided. The composite pipe (1) comprises a steel pipe body (14). A copper layer (13) is disposed at least on an inner surface of the steel pipe body (14). An end portion of the connection structure comprises sequentially from the outside to the inside a bending section (11) and a matching section (12). An inner diameter of the bending portion (11) is greater than an inner diameter of the matching section (12). When the composite pipe (1) is welded and assembled with a pipe member (2) to be welded, the matching section (12) of the connection structure is sleeved over a matching end portion of the pipe member (2) to be welded, and weld metal can be filled between an inner surface of the bending section (11) and an outer surface of the pipe member (2) to be welded, thereby effectively preventing the weld metal from contacting an end surface of the composite pipe, preventing phosphorus in the weld metal from contacting the steel pipe body (14). Thus, a lattice distortion phenomenon caused by the fusing of phosphorus with the steel material in the prior art is eliminated, such that the toughness and the plasticity of the composite pipe (1) after the welding is enhanced, thereby enhancing the performance of the product. In addition, because a weld seam is formed between the copper layer (13) and the pipe member (2) to be welded, the fluidity of the weld metal is not affected by the steel material when the weld metal melts, obtaining better fluidity and weld quality.

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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