Titanium And Copper Welding Technology

Titanium, as an active metal, reacts easily with oxygen in air to form titanium oxides, while copper is known for its excellent thermal and electrical conductivity, as well as its oxidizing properties at high temperatures. Therefore, the welding of titanium and copper has been regarded as a major challenge in the field of materials science. However, this challenge is gradually being overcome through the selection of suitable welding materials such as copper-titanium wires and titanium-copper electrodes, as well as precise control of the welding process.
Welding challenges and solutions
The differences in physical and chemical properties between titanium and copper make welding them challenging. Hydrogen absorption at high temperatures, the formation of co-crystals and hydrides, differences in coefficients of linear expansion, and the effect of oxide films are all issues that need to be addressed during the welding process.
To solve these challenges, the selection of suitable welding materials and intermediate isolation layers, such as Mo (molybdenum), Nb (niobium), Ta (tantalum) and other elements, can effectively reduce the α + β phase transition temperature and improve the performance of the welded joints. In addition, the quality of welded joints can be further optimized by precisely controlling welding parameters such as current, voltage and welding speed.
Welding Methods and Technologies
For the welding of titanium and copper, the commonly used methods include fusion welding, diffusion welding, explosion welding and brazing. Among them, tungsten argon arc welding has become the main welding technology due to its controllability and applicability. When tungsten argon arc welding is used, the key is to avoid the formation of intermetallic compounds in order to obtain excellent welded joints.
In order to achieve this goal, a single-phase β-titanium alloy with a similar organization to copper can be obtained by adding specific elements, such as Mo, Nb, and Ta, to the intermediate isolation layer of the titanium alloy. This treatment helps to reduce the degree of reaction during the welding process and improve the performance of the welded joint.

Properties of welded joints
Titanium and copper welded joints with good mechanical properties can be obtained through optimized welding techniques. For example, the tensile strength of the welded joints of chromium bronze and α + β titanium alloy can reach 304 ~ 319MPa at room temperature, and 88 ~ 102MPa at 400℃, and the cold bending angle of the joint can reach 150 ~ 180°. These excellent properties make titanium and copper welded joints in aerospace, automotive manufacturing and other fields have a wide range of applications.
In short, the welding technology of titanium and copper is the key to realize the perfect combination of these two dissimilar metals. Through in-depth understanding and precise control of the welding process, we can overcome the challenges in welding and provide more possibilities for industrial applications. At the same time, this technology opens up new paths for research in materials science.