Spot welding by automation System

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. ROBOT & THE CONTROLLER

The robot is typically comprised of a large number of
links and linkages, which are interconnected by gears,
chains, belts & screws .

The majority of industrial robots
are actuated by linear, pneumatic, hydraulic actuators
or electric Drives(AC/DC motors).

In an arc welding robot system, the torch is attached
to the wrist of the robot which has two or three axes of
motion That is YAW, PITCH & ROLL similar to human
wrist.


with regards to system design, important issues are the :

Robot work envelope,

The reach of the robot tip

The number of joints (i.e., the degrees of freedom)

The travel velocity

The repeatability

Accuracy

Resolution of motion.


The Welding Equipment (Power Source)


It generates power to generate arc welding.

NEEDS to Generate arc:-


Stability of power
Short Arc with less spatter.
A wire feeder with shorter length to the torch
Torch is equipped with shock absorption devices
A cooling system to protect the torch against heat deformation


Manipulators:


A manipulator is a device holding the work piece and is
moved around (typically with linkages) for better access and welding
positions.

The advantages of a manipulator include:

(1) A manipulator can easily be moved around the work piece for the best
welding positions.
(2) A manipulator can reduce the variation in the lead and the lag angles of
the tip.
(3) Welding can be performed in a stable flat welding position by a
synchronized and simultaneous control of a robot and a manipulator.
(4) Any hard-to-reach positions can be accessed more easily.
(5) A manipulator increases the working range of a fixed floor mounted robot
or an inverted robot.