Connecting processing technology for tube and tube plate

Abstract

The invention discloses a connecting processing technology for a tube and a tube plate. The technology comprises the following steps: performing bead weld on the tube plate, and forming a bead weldinglayer; chamfering a tube hole of the bead welding layer on the tube plate; enabling the tube to penetrate into the tube hole in the tube plate, wherein the end part of the tube is aligned to the beadwelding layer; performing expanded connection on a welding area of the tube and the tube plate; welding the tube and the tube plate, and welding by using an autopulse argon tungsten-arc welding filling wire; and performing the expanded connection on a non-welding area of the tube and the tube plate. The connecting processing technology for the tube and the tube plate is capable of increasing wearresistance and corrosion resistance of the tube plate through the bead welding layer, eliminating a gap of the welding area of the tube and the tube plate through the first expanded connection beforewelding, improving welding quality, welding by using the chamfering filling wire, reducing a leakage risk, eliminating a gap of the non-welding area of the tube and the tube plate through the secondexpanded connection after welding, preventing liquid or impurities from entering so that corrosion is generated to cause a failure welding joint, through the previous and later two times of the expanded connection and chamfering filling wire welding, guaranteeing connecting quality of the tube and the tube plate. The connecting processing technology for the tube and the tube plate is suitable forthe field of heat exchangers.

Description

technical field [0001] The invention relates to the field of heat exchangers, in particular to a process for connecting tubes and tube sheets. Background technique [0002] The C-shaped single-tube, vertical heat exchanger is one of the key equipment in the nuclear power system. The tube-sheet structure is a commonly used structural form of the heat exchanger. The tube and tube sheet are connected by the process of expanding and using. In nuclear power systems, the heat exchanger has a high working temperature and pressure. Under the action of thermal deformation, thermal shock, thermal corrosion and fluid pressure, the connection between the tube and the tube sheet is easily damaged, and it is difficult to ensure the connection by expansion joint or welding. Strength and tightness requirements. At present, the method of welding and swelling is widely used. Considering that the welding stress is much greater than the residual stress of the expansion of the expansion, gener...

AI Technical Summary

Problems solved by technology

Weld first and then expand, the main problem is to control the accuracy and fit of the tube hole on the tube plate and the tube plate. When the expansion joint is completed after welding, the center line of the tube must coincide with the center line of the tube hole center line of the tube plate, otherwise the expansion joint will be too large. Deformation will cause damage to the welded joint, and even cause the weld to be desoldered. In the actual operation process, it is difficult to control to meet the requirements

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