Welded structure of red copper heat exchange tube and tube plate and welding technology of the welding structure

Abstract

The invention discloses a welded structure of a red copper heat exchange tube and a tube plate and a welding technology of the welded structure, and the welding technology is used for welding the red copper heat exchange tube of a pressure vessel and the tube plate. The welded structure comprises the tube plate and the red copper heat exchange tube. An annular heat insulating groove is processed on the tube plate so as to form welding seam after the tube plate and the red copper heat exchange tube are welded. During welding, welding condition varies along with the variation of temperature of a workpiece so as to reach a melting effect. Compared with a conventional welding technology of the red copper heat exchange tube and the tube plate, the welding technology has the advantages that the welding condition can be adjusted in real time to realize the welding seam identical in effect and improve welding efficiency, and welding between the red copper heat exchange tube and the tube plate is realized. During the welding process of the red copper exchange tube of the pressure vessel and the tube plate, welding repair rate is lowered, first-passyield of the welding is improved, improvement of producing efficiency is facilitated, welding cost is reduced, and construction time is shortened.

Description

technical field [0001] The invention relates to a welding structure of a red copper heat exchange tube and a tube plate and a welding process thereof, belonging to the technical field of pressure vessel manufacturing. Background technique [0002] The weldability of copper heat exchange tubes and tube sheets is poor, and the joint properties such as mechanical properties, electrical conductivity and corrosion resistance are all reduced. During welding, low-melting point alloy elements evaporate, and the sensitivity of pores is high, which is prone to cracks. Defects such as penetration and lack of fusion. The copper welds and heat-affected zone grains used in the production of equipment tend to be coarse, and the strength of the joints, especially the elongation and cold bending angle, decrease significantly. According to the use requirements of the heat exchanger, the tightness and firmness of each connecting piece must be guaranteed, and there must be no defects such as e...

AI Technical Summary

Problems solved by technology

However, due to the increase in the temperature of the workpiece during the welding process, if the line energy is too large, it will easily cause pores and overburning. Therefore, the current and welding speed need to be adjusted to a lower level during the welding process.

However, the welding process parameters of traditional heat exchange tubes and tube sheets have been preset before welding, and cannot be adjusted during the welding process.

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