Friction welding,principle,working,applications, advantages and disadvantages.
FRICTION WELDING:
Principle:
It is a solid state welding process wherein coalescence is formed by the heat which is obtained from mechanically induced sliding
motion between rubbing surfaces.
Working:
Initially, the components to be welded are held under pressure.
One part is rotated at high speed and other part is held stationary. In this welding, the movable clamp is moved and contacted with the rotating component. The heat is produced between contact surfaces. This heat is used to weld the components under pressure. The pressure
during welding may be about to few Mpa.
During this period, the metal is slowly extruded from the weld region to form on upset. For stopping the relative motion, the brake
system is applied. The parameters which are considered in friction welds are:
1. Friction Pressure
2. Speed
3. Burn off.
The materials that can be welded are listed below:
1. Brass of Bronze
2. Nickel
3. Titanium alloys
4. Stainless steel
5. Aluminium and aluminium alloys
The basic joints are made by friction welding as follows:
1. Bar-belt Joint
2. Bar-Ball Joint
3. Tee-Butt Joint.
Applications:
1. It is used in super alloys.
2. It is used in produce axle shafts, valves and gears.
3. It is used in production cutting tools such as tapers reamers drills.
4. It is used in refrigeration.
5. It is used for making simple forgings.
6. It is used for manufacturing of all steel alloys.
Advantages:
1. Power consumption is low.
2. The operation is easy.
3. Parameters are easily determined.
4. It is smooth and clean process.
5. Heat is quickly dissipated.
6. It is an automation process.
7. There is no need filler metal flux.
Disadvantages:
1. Heavy components are not used for weld.
2 There is a possibility of heavy flash out.
3. Heavy rigid machines are required.
4 It is not suitable for flat and angular welds .
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