In what fields is Panasonic welding machine welding technology applied?



In the actual welding industry, due to the problems of poor precision and wear of mechanical contact sensing technology, the application has been relatively rare. At present, non-contact arc tracking and tracking methods based on visual sensors are the most widely used in practice.

In the actual welding industry, due to the problems of poor precision and wear of mechanical contact sensing technology, the application has been relatively rare. At present, non-contact arc tracking and tracking methods based on visual sensors are the most widely used in practice.

(1) Panasonic welding machine arc tracking The basic principle of arc tracking is to detect the change of welding current and arc voltage to express the change of arc length, so as to calculate the relative height of the weld and the relative position relationship with the welding groove, and execute it through welding The real-time adjustment of the mechanism realizes real-time arc tracking during the welding process. However, it is difficult to determine the exact mathematical model between the arc length, welding current and arc voltage in practice, especially in the process of melting electrode arc welding, the accurate size of the welding groove is also difficult to detect online in real time, and arc tracking requires fillet joints Therefore, the application of arc real-time tracking has great limitations.

(2) Laser structured light detection method based on the principle of triangulation ranging This method has the characteristics of high contrast, high precision, strong real-time performance, and no contact, and has been widely used. In actual use, there are many types of laser structured light, such as single-line structured light, multi-line structured light, circular and elliptical structured light, and dot matrix. The single-line structured light is the most widely used. The weld based on the single-line structured light has the characteristics of simple structure, good real-time performance, and high cost performance. It has been maturely used in weld seam tracking, groove information monitoring and other fields. The welding seam based on the multi-line laser is more complex than the single-line laser in terms of laser light path and image processing, and the effective information of the weld seam is more extracted, but the real-time performance is reduced and the product cost is increased. Circular or elliptical laser structured light has corresponding research and application in weld seam identification and location tracking, but because of low cost performance and low real-time performance, practical applications are relatively rare. The 3D reconstruction technology based on laser lattice has developed rapidly in recent years and is mainly used in medical, commercial and other fields. It is also used in the welding industry for 3D shape measurement of welding surfaces and other applications. At present, visual inspection based on laser structured light has been widely used in the fields of weld groove detection, weld location and real-time tracking, and it is also the development direction of future weld inspection and tracking.

In the actual automatic welding process of the Panasonic electric welding machine, the role of the laser weld is to accurately position the weld. Calibration real-time tracking detects the actual maximum position of the weld, and at the same time controls the movement of the welding gun to the actual maximum position of the weld. The positioning method refers to the non-real-time tracking during welding. The position of the current welding seam or workpiece is determined by two or more points of positioning before welding, and the movement track of the actuator is modified in advance, so as to achieve accurate welding. The tracking + location method is a combination of calibration real-time tracking and location methods.

Integration and application of new technologies

In recent years, with the development of offline programming technology, communication technology, virtual reality and artificial intelligence, vision-based seam tracking technology is also developing and progressing.

(1) Combination of off-line programming technology and automatic seam tracking technology. Off-line programming technology is based on computer graphics and robot kinematics to simulate the movement of the robot, and generate the robot's trajectory and corresponding robot operations through graphic programming. Compared with the traditional staff who teach programming through the robot teach pendant, offline programming can greatly improve work efficiency, and at the same time keep programmers away from harsh or dangerous working environments. In recent years, the off-line programming technology is developing in a fully automatic and even more intelligent direction. The combination of off-line programming technology and welding seam automatic tracking technology can play a part of teaching-free function. Reduce workload to a great extent.

(2) Welding remote control technology. Remote control welding means that the operator stays away from dangerous working environments such as toxic, deep water, nuclear radiation, flammable and explosive, etc., and realizes remote control of welding equipment and welding process. Because intelligent welding technology cannot be fully realized for autonomous welding in many welding fields at present, it is necessary to use remote control welding equipment to ensure the quality of welding. As early as the 1970s, the operator had already completed the welding by controlling the welding movement through the remote operation actuator; in the mid-1980s, foreign countries carried out research on the remote control welding technology using robots, and the earliest application was in Canada in 1984. Douglas Point Nuclear Power Station successfully repaired a reactor leak using remote welding. Active visual sensing is the main sensing method used in remote welding. With the development of molten pool monitoring cameras, more and more environments and parameters can be remotely controlled.

(3) Virtual reality simulation and human-computer interaction technology. In the current intelligent welding, technicians use Unity3D to realize virtual reality interactive welding in virtual simulation and human-computer interaction technology. The human-computer interaction interface is responsible for the feedback of robot motion information and the control of the robot. Humans then perform remote operations on the welding robot through the human-computer interaction interface to achieve human-computer interaction, which can replace teaching programming and offline programming to a certain extent. Combining remote welding robots with virtual reality and implementing human-computer interaction in complex and harsh environments can not only ensure the safety of welding workers but also complete welding operations efficiently.