The expansion performance of titanium welded pipes is a very important aspect in their practical applications. The expansion performance mainly involves the performance of titanium welded pipes during the expansion process, including expansion force, expansion sealing, and the tightness of the joint with the working equipment after expansion.

At first, from the perspective of expansion force, titanium welded pipes exhibited excellent performance. Under the same expansion pressure, the pull-out force of titanium welded pipes is 2.5-3.1 MPa greater than that of seamless titanium pipes. This means that during the expansion process, titanium welded pipes can better resist external forces, maintain their structural stability and integrity. This advantage enables titanium welded pipes to have higher reliability and safety in applications that require greater tensile strength, such as high-pressure vessels or pipeline systems.

Secondly, the sealing performance of titanium welded pipes after expansion is also excellent. Due to its excellent welding performance and expansion characteristics, titanium welded pipes can be tightly combined with the expansion fixture after expansion, forming an effective sealing structure. This structure can effectively prevent gas or liquid leakage in pipelines, thereby ensuring the normal operation and safety of the system.

In addition, the expansion performance of titanium welded pipes is closely related to their material properties. Titanium is an active metal that forms a dense oxide film with oxygen at room temperature, which gives titanium welded pipes excellent corrosion resistance and stability. During the expansion process, titanium welded pipes can resist the erosion of various chemicals and maintain their good expansion performance.

However, the expansion performance of titanium welded pipes is also affected by some factors. For example, the defects that may occur during the welding process, the internal stress of the welded joint, and the special crystallinity and thermal physical properties of titanium materials may all have a certain impact on the expansion performance. Therefore, in the manufacturing and expansion process of titanium welded pipes, it is necessary to strictly control the welding quality, avoid various defects, and optimize the expansion process to ensure that the expansion performance of titanium welded pipes reaches a better state.

Overall, titanium welded pipes perform excellently in terms of expansion performance, with good pull-out force, expansion sealing, and tight bonding with work equipment after expansion. This makes titanium welded pipes have broad application prospects under harsh conditions such as high pressure, high temperature, and corrosion resistance. With the continuous progress of technology and the increasing improvement of manufacturing processes, it is believed that the expansion performance of titanium welded pipes will be further improved, providing more reliable pipeline solutions for the development of various industrial fields.

While exploring the expansion performance of titanium welded pipes, we also need to pay attention to their other performance in practical applications, such as corrosion resistance, mechanical properties, etc., in order to comprehensively evaluate their applicability in practical engineering. In addition, research on the manufacturing and processing technology of titanium welded pipes is also important, which helps us further optimize their performance and expand their application areas.