1. Wire Aging
During prolonged operation of ultrasonic welding machines, the electrical wiring is subjected to high temperatures and heavy loads.  The insulation layer gradually ages and becomes brittle, losing its insulating properties, which can lead to short circuits. This problem is particularly prominent in older equipment that has been in use for many years.

2. Improper Installation
During equipment installation, loose connections, incorrect wiring, or unreasonable wiring layout that causes squeezing and friction can all lead to wire damage and short circuits. For example, if new equipment is not installed according to specifications, it can create potential problems.

3. External Environmental Interference
Moisture, dust, and chemical corrosion in the working environment can damage electrical wiring. Humid environments reduce the insulation performance of the wiring; dust accumulation can cause arcing between wires; and chemical corrosion can directly corrode the wiring, leading to short circuits.

Establishing a Preventive Maintenance System
Effective maintenance focuses on prevention. Establishing the following habits can significantly reduce the rate of short circuit failures:
1. Regular Cleaning and Tightening: Clean the dust inside the electrical box every quarter, and check and tighten all wiring terminals to prevent arcing caused by looseness.

2. Environmental Monitoring and Improvement: Ensure that the equipment operates in a suitable environment, paying attention to dust, moisture, and high temperatures. For dusty environments, increase the cleaning frequency or improve equipment sealing.

3. Establish Maintenance Records: Record the details of each maintenance and equipment operating parameters to facilitate tracking of status changes and enable predictive maintenance.