HFW Line Pipe

Welding Technology for Titanium Alloys and Steel Pipes

The welding process between titanium alloys and steel mainly depends on the differences between the two materials and their metallurgical compatibility. The main technical challenge in welding titanium alloys with steel pipes lies in their vastly different linear expansion behaviors during the welding cooling process, leading to deformation mismatches.

In addition, the low mutual solubility between titanium and steel results in the formation of hard and brittle intermetallic compounds during welding, typically titanium-ferrite compounds. These are mainly caused by the diffusion between titanium and iron during the welding process, and the oversaturation of iron in titanium continues for a period of time, producing titanium ferrite.

Welding Reinforcement for Corrosion Pits in Steel Pipes

During the transportation of petroleum, natural gas, and other materials, corrosion media, soil pH, and moisture in the surrounding environment often cause wall thinning in steel pipes, reducing the strength and thickness below acceptable limits. Additionally, mechanical damage due to displacement and human interference can cause local damage to the soil layers, leading to poor pipeline operation and significant losses. Therefore, in online welding maintenance operations, sleeve maintenance welding and pressure drilling installation are commonly used techniques.