Welding method for titanium tube with ultra-thin wall

Abstract

The invention belongs to the field of welding, and particularly relates to a welding method for a titanium tube with an ultra-thin wall. The welding method comprises the following steps: a hole is drilled in a tube plate, and a heat exchange tube and the tube plate are assembled after the ends of the heat exchange tube are cleaned, wherein it is guaranteed that the length of the portion, extending out of the tube plate, of the heat exchange tube ranges from 1mm to 2mm, and the distance between the outer wall of the heat exchange tube and the pore wall of the tube is not larger than 0.15mm; a tube plate automatic welding machine is adopted, and argon shields are formed on both the outer wall and the inner wall of the heat exchange tube; the purity of argon reaches 99.999 percent, so that the argon is high-purity argon, and a welding gun is closely attached to a workpiece to conduct all-position welding. According to the welding method for the titanium tube with the ultra-thin wall, gas shields are formed on both the outer wall and the inner wall of a tube in the welding process, so that welding gas is synchronous with gas inside the tube and gas outside the tube, the gas is saved, and oxidation does not occur easily in the welding process; by the adoption of the welding method, a heat exchange tube with the wall thickness being equal to or smaller than 0.8mm can be welded, the heat exchange tube and the tube plate are well fused after being welded, and a leakage does not easily occur in a striking and pressing process.

Description

technical field [0001] The invention belongs to the field of welding, in particular to a welding method for titanium ultra-thin-walled pipes. Background technique [0002] Titanium heat exchangers are manufactured, and the tube box is usually welded with titanium explosive composite plates and titanium tubes. Due to the high price of titanium, in order to reduce costs, on the basis of meeting the design strength, heat exchange tubes with thinner tube walls are often used in design, but for each manufacturer, the thinner the tube wall, the more difficult it is to weld , if the welding problem of thin-walled titanium tubes and tube sheets can be solved, it will undoubtedly reduce a large number of procurement costs for enterprises. [0003] Generally, for the welding of heat exchange tubes with a wall thickness of 0.8 mm and above, it is easier to achieve welding, but it is easy to appear after welding: poor fusion of heat exchange tubes and tube sheets after welding, severe ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a welding method for titanium ultra-thin-walled tubes. Seam fusion depth is shallow, pressure is easy to leak and other problems

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