Basic functions
The arc welding process is much more complex than the spot welding process, and the tool center point (TCP), that is, the movement trajectory of the wire end, the attitude of the welding gun, and the welding parameters all require precise control. Therefore, in addition to the general functions mentioned above, the arc welding robot must also have some functions suitable for the requirements of arc welding.
Theoretically, a robot with 5 axes can be used for arc welding, but it is difficult to use a robot with 5 axes for welds with complex shapes. Therefore, unless the weld is relatively simple, a 6-axis robot should be used as much as possible.
In addition to the "zigzag" corner welding or small-diameter circular weld welding, the trajectory of the arc welding robot should be close to the trajectory of teaching, and it should also have software functions of different swing styles for programming to be used for swing welding, and the swing 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 finding, automatic finding of the starting position of the weld, arc tracking and automatic re-arc re-striking functions.
Welding equipment
Arc welding robots mostly use gas shielded welding methods (MAG, MIG, TIG), and the usual thyristor, inverter, waveform controlled, pulsed or non-pulse welding power supply can be installed on the robot for arc welding. Since the robot control cabinet adopts digital control, and the welding power supply is mostly analog control, it is necessary to add an interface between the welding power supply and the control cabinet. In recent years, foreign robot manufacturers have their own specific supporting welding equipment, which has been broadcast in the corresponding interface board. It should be pointed out that the arc time accounts for a large proportion in the working cycle of the arc welding robot, so when choosing the welding power supply, the capacity of the power supply should generally be determined by the continuous rate of 100%.
The wire feeding mechanism can be installed on the upper arm of the robot, or it can be placed outside the robot, the hose between the former welding torch and the wire feeder is shorter, which is conducive to maintaining the stability of wire feeding, and the latter hose principal, when the robot sends the welding gun to certain positions, the hose is in a state of multi-bending, which will seriously affect the quality of wire feeding. Therefore, the installation method of the wire feeder must consider the problem of ensuring the stability of the wire feeding.
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