Low-stress copper steel composite welded pipe and production method thereof

Abstract

The invention discloses a pipe for a heat exchanger and particularly relates to a low-stress copper steel composite welded pipe and a production method of the low-stress copper steel composite welded pipe. The low-stress copper steel composite welded pipe comprises copper layers (2) and a steel layer (3), wherein the steel layer (3) is arranged between the two copper layers (2), after the copper layers (2) and the steel layer (3) are bended and form the pipe, padding brazing solders (1) are welded to the contact portion between the two sides of each copper layer (2) and the two sides of the steel layer (3). The low-stress copper steel composite welded pipe has the advantages that 80% of the heat conduction effect of copper and 100% of the corrosion resistance effect of the copper are achieved at about 50% of the price of copper; the anti-corrosion effect is good, a low-stress copper welding rod is applied to welding, and the copper layers and the mechanical performance of a welding joint can be identical to those of other parts; the mechanical performance is good, and the tenacity and the strength of steel materials are achieved.

Description

technical field [0001] The invention relates to a pipe fitting for a heat exchanger, in particular to a low-stress copper-steel composite welded pipe and a production method thereof. Background technique [0002] In the prior art, copper pipes are generally used for heat exchangers on equipment such as refrigeration heaters, refrigerator air conditioners, or pipe fittings in domestic water projects. [0003] (1) Copper tubes have good performance in heat conduction, corrosion resistance, etc., are durable and hygienic, but the cost is high, and copper resources are increasingly in short supply; [0004] (2) It is easy to corrode if it is replaced by ordinary carbon steel pipe; [0005] (3) The cost of copper-plated steel pipe is low, but the copper-plated layer is too thin, and the copper layer is easy to fall off. The current production process is still unable to coat the inner wall of the pipe, so the problem of anti-corrosion of the inner wall cannot be fundamentally sol...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-stress copper-steel composite welded pipe and its production method, in order to solve the problem of existing copper pipes used in heat exchangers on refrigeration heaters, refrigerator air conditioners and other equipment or in domestic water projects. Too high cost, weak anti-corrosion ability and easy to cause environmental pollution

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