The arc welding process is much more complicated than the spot welding process. The tool point (TCP), that is, the trajectory of the wire tip, the torch attitude, and the welding parameters all require precise control. Therefore, in addition to the general
function, the arc welding robot must also have some functions suitable for arc welding.
Although in theory, a robot with five axes can be used for arc welding, it is difficult to use a five-axis robot for a complex-shaped weld. Therefore, unless the weld is relatively simple, you should try to use a 6-axis robot.
When the arc welding robot is used for "Zigzag" or small diameter round weld welding, its trajectory should be close to the teaching trajectory. It should also have different swinging style software functions for programming. Welding, and swinging at the pause point in each cycle, the robot should also automatically stop moving forward to meet the process requirements. In addition, there should be contact locating, automatic search for the starting position of the weld, arc tracking and automatic re-arcing.
Arc welding robots mostly use gas shielded welding methods (MAG, MIG, TIG), and the usual welding power supplies such as thyristor, inverter, waveform control, pulse or non-pulse can be installed in the robot working arc welding. Since the robot control frame is digitally controlled, and the welding power source is mostly analog control, an interface needs to be added between the welding power source and the control cabinet.
In recent years, foreign robot manufacturers have their own specific matching welding equipment. These welding equipments have been inserted into the corresponding interface boards and attached to the interface box. In the arc welding robot working cycle, the arc time accounts for a large proportion. Therefore, when selecting the welding, the capacity of the power source should generally be determined according to the continuous rate of 100%.
The wire feeder can be mounted on the upper arm of the robot or outside the robot. The hose between the former and the wire feeder is shorter, which is beneficial to maintain the stability of the wire feeding. When the robot sends the torch to a certain position, the hose is in a multi-bend state, which seriously affects the quality of the wire feed. Therefore, the installation method of the wire feeder must consider the problem of ensuring the stability of the wire feed.