What is the most common technique used for attaching turbine blades?

The fur tree design is the most common technique used for attaching turbine blades due to its effectiveness in securing the blades securely to the rotor while allowing for efficient transfer of loads during operation. This method consists of a series of slots or notches that resemble the shape of a Christmas tree, where the blade root fits into these slots. This design not only ensures that the blade can withstand the high centrifugal forces and thermal stresses encountered during turbine operation, but also allows for easy installation and removal for maintenance or replacement.

The fur tree attachment provides a significant advantage in terms of reliability and durability, making it the preferred choice in modern turbine engines. In contrast, other methods such as welding may introduce stress concentrations or make maintenance more challenging, while bolting and clamping could potentially lead to less efficient load distribution and are not as widely used in high-performance turbine designs.