2. Introduction-Percussion Welding
• Percussion welding (PEW) is a type of
resistance welding that blends dissimilar metals
together.
• Creates a high temperature arc that is formed
from a short quick electrical discharge.
• Immediately following the electrical discharge,
pressure is applied which forges the materials
together.
• This type of joining brings the materials together
in a percussive manner.
3. • Percussion welding is similar to flash
welding and upset welding but is generally
considered to be more complex.
• It is considered to be more complex because it
uses an electric discharge at the joint,
followed by pressure being applied to join the
materials together.
4. • Percussion welding is used to join dissimilar
metals together, or used when flash is not
required at the joint.
• Percussion welding is used on materials that
have small cross sectional areas.
5. Advantages
• Advantages of using percussion welding types
include
a shallow heat affected zone,
and the time cycle involved is very short.
• Typical times can be found to be less than
16 milliseconds.
6. http://apac.totalmateria.com/
• Percussion welding (PEW) is a resistance
welding process which produces coalescence
of the abutting members using heat from an
arc produced by a rapid discharge of electrical
energy.
7. • Pressure is applied progressively during or
immediately following the electrical discharge.
• This process is quite similar to flash welding
and upset welding, but is limited to parts of
the same geometry and cross section.
8. • It is more complex than the other two
processes in that heat is obtained from an arc
produced at the abutting surfaces by the very
rapid discharge of stored electrical energy
across a rapidly decreasing air gap.
9. • This is immediately followed by application of
pressure to provide an impact bringing the
two parts together in a progressive percussive
manner.
• The advantage of the process is that there is
an extremely shallow depth of heating and
time cycle is very short.
• It is used only for parts with fairly small cross-
sectional areas.
