2. Friction welding is a solid state joining process that
produces coalescence by the heat developed between two surfaces by
mechanically induced surface motion. It is solid state joining
process. Mechanical friction between a moving work piece and a
stationary component. Lateral force (upset) is applied to
plastically displace and fuse the materials Introduction
3. Types of Friction Welding Spin Welding: A rotating chuck
along with flywheel. After reaching to required speed motor is
removed from flywheel.
4. Linear Friction Welding: Oscillating Chuck is used. Use for
non-round shapes as compare to Spin welding. Material should be of
high shear strength.
5. Friction Surfacing: It is a surface coating process. Coating
material Mechtrode is rotated under pressure over substrate.
6. Friction Stir Welding: A cylindrical shouldered tool, with a
profiled probe (nib or pin) is used. Friction is between tool
shoulder, nib and work metal.
7. Advantages of Friction Welding Simplicity of operation and
simple equipment. Less time requirement. Low Surface impurities and
oxide films. Compare to resistance butt welding produces improved
welds at higher speed and lower cost, less electric current is
required. Heat affected zone is small as compare to conventional
flash welding. Less shortening of the component, as compared to
that in flash or butt welding. There is no flux, gas, filler metal
or slag present to cause imperfections in welds. Disadvantages of
Friction Welding Process is restricted to flat and angular butt
welds. Use only for joining small parts. In case of tube welding
process becomes complicated. In case of high carbon steels it is
difficult to remove flash. It require heavy rigid machine due to
high Thrust pressure. Friction Welding Machine
8. Applications: Automobile: Bimetallic engine valve, universal
joint yoke, gear hub etc. Aerospace: Turbine blade joining,
seamless joining etc. Consumer: Hand tools, sports equipment
Industrial: Spindles, tapers, tools Military Medical: Stainless
steel joining of containers Marine: Shipping Industry
Mining/Drilling: Twist drill etc. Hydraulic equipments
