Heat exchanger pipe and pipe plate welding process

Abstract

The invention discloses a heat exchanger pipe and pipe plate welding process. The heat exchanger pipe and pipe plate welding process comprises the following steps that the surfaces of the marked positions of a heat exchanger pipe and a pipe plate are polished through a special polisher, and an oxidation layer or a grease layer on the surfaces is removed through polishing; the polished heat exchanger pipe and pipe plate are fixedly mounted on a multi-freedom-degree clamp, the polishing position of the heat exchanger pipe corresponds to the polishing position of the pipe plate, and the pipe plate and the heat exchanger pipe are oppositely arranged in parallel; the to-be-welded position and the position nearby the to-be-welded position are heated through a flame spray gun, and the temperatureof the to-be-welded position is increased to 200 DEG C to -230 DEG C; and a nitrogen isolation device is moved to the position below the welding position of the heat exchanger pipe and the pipe plate, the welding position is filled with nitrogen, and oxygen is isolated. The invention relates to the technical field of heat exchanger pipes. By means of the heat exchanger pipe and pipe plate weldingprocess, the purposes of pretreating the welding position and improving the welding precision and quality are achieved.

Description

Technical field [0001] The invention relates to the technical field of heat exchanger tubes, in particular to a welding process for heat exchanger tubes and tube sheets. Background technique [0002] The heat exchange tube is one of the elements of the heat exchanger, which is placed in the cylinder and used for heat exchange between two media. It has high thermal conductivity and good isothermal properties. It is a device that can quickly transfer heat energy from one point to another, and there is almost no heat loss, so it is called a heat transfer superconductor, and its thermal conductivity is thousands of times that of copper. [0003] In addition to light tubes, heat exchangers can also use various enhanced heat transfer tubes, such as finned tubes, threaded tubes, spiral grooved tubes, etc. When the heat-supply coefficient on both sides of the inner diameter of the tube differs greatly, the fin of the finned tube should be arranged on the side with the lower heat-supply c...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a heat exchanger tube and tube plate welding process, which solves the problem that the current heat exchanger tube and tube plate are welded directly through a welder, and the oxides on the surface of the heat exchanger tube and tube plate will be damaged. Reduce the quality of welding seam connection. Due to the high welding temperature and low structural temperature, the temperature difference will cause cracks in the weld seam. At the same time, the high temperature of welding will oxidize the weld seam, which will also reduce the problem of welding quality.

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