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1. Chapter Name :- Welding Process
Topic Name :- Friction Welding
❑ Friction welding is a solid-state process (non-fusion) that
is achieved through frictional heat
❑ This heat is generated by controlled contact of two
components until material reaches its plastic state, at
which time plasticized material begins to form layers
that intertwine with one another
❑ The friction welding machine controls this contact
through a series of unique parameters for rotational
speed (rpm’s), axial force and time
❑ Once these parameters are established, they are recorded,
stored and then repeated with each cycle of the machine
What is Friction Welding?

2. Chapter Name :- Welding Process
Topic Name :- Friction Welding
• Types of friction welding
• Inertia Stir
• Friction welding

3. Chapter Name :- Welding Process
Topic Name :- Friction Welding
In Inertia Welding, one of the work pieces is connected to a
flywheel and the other is restrained from rotating. The
flywheel is accelerated to a predetermined rotational speed,
storing the required energy. The drive motor is disengaged
and work pieces are forced together by the friction welding
force
Inertia Friction Welding

4. Chapter Name :- Welding Process
Topic Name :- Friction Welding

5. Chapter Name :- Welding Process
Topic Name :- Friction Welding
The frictional heating causes a softened zone of material to
form around the probe. This softened material cannot escape
as it is constrained by the tool shoulder. As the tool is
traversed along the joint line, material is swept around the
tool probe between the retreating side of the tool (where the
local motion due to rotation opposes the forward motion) and
the surrounding unreformed material
Stir Friction Welding

6. Chapter Name :- Welding Process
Topic Name :- Friction Welding

7. Chapter Name :- Welding Process
Topic Name :- Friction Welding
⮚ Strong welds for all geometries
⮚ Narrowest heat affected zones
⮚ Short weld times save you time and money
⮚ There is no melting ,hence no solidification
defects occur, gas porosity , and segregation
⮚ Easy to manage with only two quality control
parameters - RPM and Pressure
⮚ Used for some alloys which are not fusion
weldable like AL 7075
⮚ Limitless panel length and width
⮚ Join dissimilar alloys
Advantages of Friction Welding

8. Chapter Name :- Welding Process
Topic Name :- Friction Welding
⮚ Worm holes
⮚ Oxide film due to Zn affecting surface tension
of weld pool reduced diffusion
⮚ Cannot easily be used for making fillet welds
Disadvantages