Taking titanium and titanium alloy tubes for heat exchangers and condensers as an example, the national standard is GB/T 3625-2007, the American standard is ASTMB338, and the differences between titanium welded tubes and titanium seamless tubes in terms of chemical composition, mechanical properties, process performance and other indicators Not big, even the same. With the advancement of welding and heat treatment technology of titanium welded pipes, domestic thin-walled titanium welded pipes generally adopt single-gun or multi-gun TIG/PAW self-fusion welding.
After welding, the online heat treatment process is adopted. By optimizing the welding and annealing processes, the microstructures of the base metal, welds, and heat-affected zone are basically close to each other, at the same time, the welding stress is eliminated and the weld structure is homogenized. Through comparison, it is found that the composition of the welding seam of the titanium welded pipe is basically the same as the base metal, and the mechanical properties and corrosion resistance of the weld seam are no different from the base metal.
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