What are the faults of ultrasonic metal spot welding machine
There is a certain amount of heat when the welding head is working, which is caused by the mechanical loss of the material itself and the heat conduction of the welding parts. The standard for judging whether the welding seam heat is normal is no load (that is, no contact with the workpiece), continuous ultrasonic wave for more than half an hour, and the temperature does not exceed 50-70°C. If it is thermally damaged, the weld is damaged or the material is unqualified. The improvised explosive device needs to be replaced.
2. Scream
When screaming occurs during welding, the following reasons should be analyzed:
(1) Whether the mounting screws are loose
(2) Whether there are cracks in the welded joints
(3) Whether the welding joint is in contact with non-contact objects.
2. overload
When the generator issues an overload alarm, the following steps should be taken to check:
(1) During the no-load test, if the working current is normal, it may be that the welding head is in contact with objects that should not be touched, or the parameter adjustment between the welding head and the welding seat has failed.
(2) When the no-load test is abnormal, first observe whether the weld is cracked and whether the installation is firm, then remove the weld, conduct a no-load test, eliminate the sensor + horn problem, and gradually remove it. After eliminating the possibility of sensor + horn failure, replace with a new welding joint for judgment.
(3) Sometimes the no-load test is normal, but it cannot work normally. This may be due to internal changes in acoustic energy such as welding heads that affect the transmission of acoustic energy. Here is a relatively simple method of judgment: hand touch method. When the welding head or welding angle is working normally, its amplitude is very uniform. The hands feel like velvet. When the sound energy is not transmitted smoothly, the hand will feel like bubbles or burrs. At this time, the elimination method should be used to remove the problematic parts. The same situation occurs when the generator is abnormal. Generally, the input waveform of the sensor should be a smooth sine wave. This phenomenon also occurs when there are spikes or abnormal waveforms in the sine wave. At this time, it can be distinguished by replacing it with another whole acoustic energy component.
