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WELDING ROBOTS

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When following through the history of welding, in year 1988, matrix of robots are employed in the automobile industry to perform resistance spot welding on car bodies. Following that, more and more arc welding robots are being installed both in large and small manufacturing plants. Since then, welding robots are used in two ways in manufacturing -- as elements in a production line and as stand-alone units (or Flexible Robotic Manufacturing System) for batch production.

 FANUC Robotics

FANUC Robotics' DualARM System allows two robots and a positioner to be controlled in a single program with coordinated motion and arc start synchronization. This improve arc quality. It is easy to use because of the single point of control. The DualARM System tightly integrates two ARC Mate robots controlled through one CPU and teach pendant, which provides a common interface for the entire system. It has multi-group motion feature that allows multiple motion groups to operate simultaneously while running multiple tasks. Tightly-integrated, auxiliary axes allows both weld torches to be repositioned faster during part repositioning thus reduce cycle time.

Fanuc Welding Robot

 KAWASAKI Robotics

Arc Welding: In 1995, Kawasaki developed an adaptive laser vision arc welding system. The Kawasaki adaptive laser vision system provides tracking and adaptive control of the welding process, and adjustment for part position and joint variations. With adaptive control of all welding parameters, tracking speeds greater than 10 meters per minute can now be attained.

9 Axis Arc Welding Arc Welding with Positioner Arc Welding with Laser Vision Inverted Welding with Positioner

Pneumatic spot welding utilizes an air cylinder to produce the clamping force for the welding electrodes. The C-controller gives the operator two positions in which the weld gun can open. The first position is completely open and the second position is partially open. The partially open position cuts down on cycle time, because the gun does not have to open fully before the robot starts its next movement.

Servo spot welding uses an additional servo motor and encoder (7th axis) of the robot to drive and control the clamping force of the welding electrodes. Using a spare robot axis to actuate the weld gun gives added benefits than a pneumatic weld gun. First, a wider range of clamping pressures can be controlled for different materials and thicknesses. Reduced cycle time can be achieved by having full control of the stroke of the weld gun. Along with this, it gives a low impact condition when contacting the work piece at the beginning of a weld sequence. This gives a longer life span of the electrodes. And it is much quieter than a pneumatic weld gun.

Spot Welding Car Body Spot Welding Cell Spot Welding Gun Spot Welding

Both of these weld guns can be gun changer compatible. This means that one operation can use more than one weld gun per robot. On the other hand, pedestal welding uses a fixed spot welding gun and a robot with a material handling end effector. The robot manipulates a part through the pedestal welding gun.

 KUKA Robotics

KUKA Robot are used in the body shop of the Ford plant in Cologne-Niehl, Germany. With the installation of the robot technology, it ensures that the gap dimensions on the doors and trunk lid of the Fiesta model can be reduced to 3.5 mm. In addition to pneumatic spot weld guns, electric motor-driven servo guns are also guided by robots. Because the closing motions of the gun can be defined precisely, this result in a more gradual force build-up, longer electrode life, better workpiece detection, shorter cycle times and lower noise levels.

Kuka Welding Robots

 Motoman Welding Solutions

ArcWorlds/FabWorlds: A fully integrated, pre-engineered robotic arc welding solution features a Motoman arc welding robot, robot controller and menu driven arc welding a24-Feb-2007rt positioner, operator station and safety environment. ArcWorlds can be configured with a second robot, a heavy-duty positioner or servo-controlled external axes for coordinated motion. Motoman Arc Welding Robotic Solution
Spot World: Two Motoman UP130 robots simultaneously spot weld on main and subassemblies located on a 180 degrees indexing positioner with multi-stage fixtures. Automatic fixtures that allow access for multiple vertical and horizontal spot welds. Motoman Spot Welding Robotics Solutions

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Updated on 24-Feb-2007