Heat exchanger cooling tube and tube plate bimetal welding technology

Abstract

The invention relates to the machinery manufacturing field, in particular to a heat exchanger cooling tube and tube plate bimetal welding technology. The technology includes that a NiCu cooling tube is inserted on a CS tube plate and the joint part of tube head and the tube plate is welded. The technology is characterized in that: BFe10-1-1 argon arc welding stick with the Phi of 0.8mm is selected, an automatic argon arc welder is adopted, current is set to be 60-120A, and welding speed is 75mm / min. The invention solves the problem that the heat exchanger cooling tube and tube plate are made by different metals and are difficult to weld, breaks through the traditional concept and realizes CS-NiCu alloy bimetal welding, thus the design of the heat exchanger and the tube plate can adopt simple substance CS material, manufacturing cost is reduced, and manufacturing period of the heat exchanger is shortened.

Description

(1) Technical field: [0001] The invention relates to the field of mechanical manufacturing, and relates to a bimetallic welding process of a heat exchanger cooling tube and a tube sheet. (two) background technology: [0002] At present, most of the coolers of some large compressor companies in the international market originally used imported products, which were localized due to the need to reduce costs. The pressure of the cooler at the end of the compressor is relatively high, generally above tens of bars, and some The cooling pipe is made of NiCu alloy. Due to the structure, strength and anti-corrosion requirements, the tube plate assembled with the cooling pipe is generally made of CS material. The traditional concept is that the welding between different materials cannot guarantee the quality. It is difficult to realize. Therefore, in order to ensure the sealing of the tube and the tube sheet, the cooling tube and the tube sheet must be welded for strength. The origina...

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Problems solved by technology

[0002] At present, most of the coolers of some large compressor companies in the international market originally used imported products, which were localized due to the need to reduce costs. The pressure of the cooler at the end of the compressor is relatively high, generally above tens of bars, and some The cooling pipe is made of NiCu alloy. Due to the structure, strength and anti-corrosion requirements, the tube plate assembled with the cooling pipe is generally made of CS material. The traditional concept is that the welding between different materials cannot guarantee the quality. It is difficult to realize. Therefore, in order to ensure the sealing of the tube and the tube sheet, the cooling tube and the tube sheet must be welded for strength. The original imported product tube sheet uses a CS-NiCu composite tube sheet, so that the welding part of the cooling tube and the tube sheet belongs to The same material is welded, but CS-NiCu composite tube sheet suppliers are less, the manufacturing cycle is long, and the cost is high

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