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infusion welding
metal coalescence is created by melting a base metal and filler metals together
four by melting the base metal alone
the principal fusion welding processes are
arc welding
resistance welding
laser beam welding
and electron beam welding
arc welding processes use an electric arc is the heat source through mails
enjoying the base metals
chiaki struck between the work pieces and that's it for the electrode
arc welding electrodes are usually consumable
but can be
non consumable
the consumable electrode he's usually wire or rock and the current that
sustains the yard also melts the electrode
so that it applies to learn that for the joy
the electrode may also produced by slag covering
to protect the hot weld metal from oxidation
the most common on consumable electrode is that tungsten rod
which carries the electric current
people welding operations using of non consumable electrode also requires a
filler metal
it is supplied by a separate wire
rod for consumable insert
while welding the electrode is movie either manually
for mechanically along the joint
for the electrode is held stationary
and the work pieces move
for welding encompasses a variety of processes
the primary types being
shielded
metal arc welding
merged arc welding
gas metal arc welding
flux cored arc welding
gaston stone arc welding
and plasma arc welding
resistance welding processes
produced coalescence of overlapping four pieces with heat
generated by the resistance of the word pieces to the floor of electric welding
current
and the application of pressure
resistance welding is primarily used to join sheet metal stock
but is sometimes used to join in place
all metals which can be fusion welded
are well double by resistance welding
resistance welding processes used copper electrodes
these electrodes performed four function
they conduct the welding current to the work
and in some cases
fix the current density in the weld zone
they transmit a force to the work pieces
they dissipate some heat from the weld zone
and they maintain relative alignment and position of the work pieces
in some resistance welding operations
very high electric currents are used to quickly produced the resistance heat
necessary for fusion
the three principal types of resistance welding are
spot welding
seam welding
and projection welding
spot welding
refers to making welds one-at-a-time between the electrodes
several or many individual spot welds may be required depending on the
application
spot welding
with the electrodes maneuvered by articulated arm robots
is commonly used to join sheet components of automobiles
in seam welding
coordinated pulses of electric current from rotating we'll electrodes
produced a series of overlapping spot welds
resulting in a leak type welded joint
in projection welding
the welds are localized to predetermine points by projections enforcements or
intersections
several points maybe welded simultaneously