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Although the titanium surface has a dense passivation film, Titanium Pipe in many strong corrosive medium is very resistant to corrosion, but because of the great affinity of titanium and hydrogen. Very easy to absorb hydrogen. At room temperature occurs, high temperature (such as 100 ℃) hydrogen absorption quickly. Hydrogen in the titanium in the fixed melting limit is very small (about 20ppm), more than the limit will be in the titanium surface precipitation of hydride (TtH2). With the increase of surface TiH2, Titanium Pipe the impact value and elongation of titanium decrease rapidly. In addition, in the transformation of the old unit, because the tube plate is copper alloy, condenser tube with titanium, Titanium Pipe which requires the use of cathodic protection device to prevent electrochemical corrosion such as Hitachi's power plant condenser with seawater cooling, titanium tube and copper alloy Plate composition of the galvanic, when the protection potential is less than a 0.75 v (ScE) when the export of titanium tube end of hydrogen, the use of hydrogen content of 650 ppm a year; if the potential selection of a 0.5 ~ 0.75.75 (scE) At room temperature, titanium does not occur hydrogen absorption.
As the corrosion resistance of titanium tube is good. Titanium condensers are not damaged by corrosion. Titanium Pipe But the titanium tube may be damaged due to vibration. Titanium Pipe In order to avoid the vibration problem of the titanium tube, it is necessary to determine the spacing of the spacer when making the base titanium condenser. In the transformation of the old unit, it is necessary to examine whether the original spacer spacing is suitable for the titanium tube.
Expansion Technology of Tubular Plate with Titanium Tube and Titanium Steel and Welding Process by Hand TIG Welding. And through the manufacture of liquid ammonia refrigerator proved that the titanium tube and titanium steel composite tube plate in the choice of a reasonable manufacturing process under the premise of access to high-quality weld, while titanium and titanium composite plate heat exchanger equipment manufacturing Accumulated a certain amount of experience.
Process test and welding process evaluation Titanium is an active element, at room temperature and oxygen can produce dense oxide film and maintain high stability and corrosion resistance. The oxidation of titanium and nitrogen, nitrogen, hydrogen reaction speed is faster, Titanium Pipe easy to produce brittle material, Titanium Pipe so that welding is very poor, so in order to ensure that the titanium tube and titanium steel composite tube plate Welding quality, Titanium Pipe we start from the material and equipment structure, after the process test and welding process assessment, get some data.