Abstract
In order to manufacture Gr.1 titanium heat exchangers, the welding property and weld structure of titanium tube-to-tubesheet are analyzed. The procedure of Pulse GTAW is used and the visual inspection, dimensional inspection, chemical composition, mechanical properties and metallographic structures are tested and analyzed. The results show that the weld joint can get ideal structure and good chemical composition, mechanical properties and corrosion resistance. The successful welding qualification has accumulated valuable experience for manufacture of titanium heat exchangers.
Highlights
A pressure vessels order for purified terephthalic acid (PTA) plant have been received by a company in Shanghai
SB338 Gr.1 titanium tubes and SA266 Gr.2+ SB265 Gr.1 composite materials are used in design of the heat exchanger tube side
Gr.1 titanium tube is ASME SB338 material, Gr.1 titanium plate in the composite material is ASME SB265 material
Summary
A pressure vessels order for purified terephthalic acid (PTA) plant have been received by a company in Shanghai. SB338 Gr. titanium tubes and SA266 Gr.2+ SB265 Gr. composite materials are used in design of the heat exchanger tube side. Gr. titanium tube is ASME SB338 material (equivalent to TA1 according to GB/T 3625-2007 in China), Gr. titanium plate in the composite material is ASME SB265 material (equivalent to TA1 according to GB/T 3621-2007 in China). SA266 Gr. in the composite material is a carbon steel forging material for pressure vessel components, which is connected SB338 Gr. titanium tubes by expansion and no welding. In accordance with the code of TSG 21‘Supervision Regulation on Safety Technology for Stationary Pressure Vessels’ and the product standard of JB/T 4745 ‘titanium welded vessels’, the welding procedure qualification for the tube-to-tubesheet should be tested to determine the appropriate welding procedure parameters before the manufacturing work of the first pressure vessel
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