Three Faults In Ultrasound Welding

1. When the generator gives an overload alarm, the following steps should be taken to check it:

1. Sometimes the no-load test is normal, but it can not work properly. It may be that the internal changes of the acoustic energy source such as the weld head cause the transmission of acoustic energy to be impaired. Here is a relatively simple judgment method: hand touch method. The amplitude of the welding head or horn working normally is very uniform. The hand feels like velvet. When the sound energy is not transmitted smoothly, there will be a feeling of bubbles or burrs when the hand feels. At this time, the elimination method should be used to remove the problematic parts. When the generator is abnormal, it can also produce the same situation. Normally, the input waveform of the transducer should be a smooth sinusoidal wave. When there are spikes or abnormal waveforms in the sinusoidal wave, this phenomenon can also occur. At this time, another whole branch of acoustic energy element can be used to replace it to distinguish.

2. Ultrasound no-load testing, if the working current is normal, may be the failure of the parameter adjustment between the Ultrasound welding head and the weld seat when the Ultrasound welding head contacts the object that should not be contacted.

3. When the ultrasonic no-load test is abnormal, we should first observe whether the ultrasonic welding joint has cracks and whether the installation is firm, then remove the welding joint and carry out no-load test to eliminate the problem of transducer + horn, and remove it step by step. After eliminating the possibility of transducer + horn failure, the new weld joint is replaced to judge.

2. Abnormal Fever by Ultrasound

Ultrasound welding head will have a certain heating phenomenon when it works, which is due to the loss of mechanical energy of the material itself and the heat conduction of the ultrasonic object. Ultrasound welding head heat is normal judgment standard is no load (that is, no contact with the workpiece), continuous emission of ultrasound for more than half an hour, temperature can not exceed 50-70 C, such as calorific damage, prove that the ultrasonic welding head has been damaged or the material is not qualified, need to be replaced.

3. Abnormal screaming in ultrasonic products

When the scream occurs during the operation of the ultrasonic welding head, the following reasons should be analyzed:

1. Whether or not the welding head is in contact with the non-contact objects.

2. Is the installation screw loose?

3. Whether Cracks Occur in Weld Joints