Friction welding (FW) is a class of solid-state welding processes that generates heat through mechanical friction between a moving workpiece and a stationary component, with the addition of a lateral force called "upset" to plastically displace and fuse the materials.
Technically, because no melt occurs, friction welding is not actually a welding process in the traditional sense, but a forging technique.
However, due to the similarities between these techniques and traditional welding, the term has become common. Friction welding is used with metals and thermoplastics in a wide variety of aviation and automotive applications.
Step1 : Parts are loaded into welder, one in rotating spindle and other in stationary clamp.
Step 2 :
Component in spindle is brought up to pre-determined rotational speed and then a pre-determined axial force is applied.
Step 3 :
Rotational speed is then stopped and increased axial force is applied until desired upset is obtained.
Features Of Friction Welding
»
Pressure welding process causes forging effect
»
Fine-grained structure
»
The static strength.
»
The welds are leak-tight.
»
Heat Affected Zone (HAZ).
»
Short welding times.
»
The rotation symmetric heat application, high dimensional accuracy.
Variables in Friction Welding
Non Machine Variables
Machine Variables
Minor influance Variables
»
Material type to be welded.
»
Part configuration.
»
Size
»
Friction Pressure.
»
Forging Pressure.
»
Friction Time.
»
Braking Time.
»
Upset Delay Time.
»
Upset Time.
»
Linear Feed.
»
Initial condition of friction surfaces
»
1.Shape of the pieces to be welded (affecting temperature dissipation
from the welding region).
