How to weld different metals by using friction welding? There are three techniques viz: Linear Friction Welding, Spin friction Welding and Friction Surfacing.
In this technique work pieces are clamped in two supports, one of which is stationary and the other one is spinning. The spinning piece is allowed to rotate along with the mechanically rotated device called flywheel which assists prolonged rotation in later stage by storing the rotational energy. As the rotating component achieves the required spinning rate, motor is switched off but the component keeps on spinning due to stored rotational energy in the flywheel. At that moment both pieces are brought together with applied pressure until the weld stiffens and spinning action stops. As flywheel works on the basis of high moment of inertia and that is why this technique is also known as inertial friction welding technique.
This technique is same like spin technique excepting the linear oscillation rather than the use of spinning movement. Under the applied pressure, moving piece is allowed to oscillate relatively with the stationary piece in the form of sine wave. The lateral force is acted along the axis of oscillation until the weld sets.
It is another solid state welding technique, in which a rod with special coating is allowed to rotate on the substrate to deposit a plasticized weld layer on it. In this process the deposited layer is homogeneous, having the same composition of consumable rod, because no dilution of substrate base metal occurs. Moreover this technique is cost effective and can be applied to eliminate high cost operations.
In Orbital Friction Welding, the components are allowed to rotate in a small size orbit, against each other. After attaining the required heat, the orbiting faces of components are brought to one axis by applying more pressure.