2. WHAT IS WELDING?
Welding is a permanent
metal joining process by
which two similar or
dissimilar metals may be
joined by heating them to
a suitable temperature
with or without filler
metals and with or
without external pressure.
4. SPOT WELDING
Resistive Spot Welding
is a process in which
contacting metal
surfaces are joined by
the heat obtained from
resistance to electric
current.
9. ADVANTAGES:
Quick and Easy
No need of Flux and Filler metals
Multiple sheets joined together at the same
time
No dangerous open flames
Saves production cost
Dimensional Accuracy
10. LIMITATIONS:-
Difficulty for maintenance or repair
Generally have higher cost than
most arc welding equipment
Low tensile and fatigue strength
The full strength of the sheet cannot prevail
across a spot welded joint