Miyachi Unitek offers a variety of weld monitors for different environments and applications. Monitors are either fixed – designed to stay with a machine, or portable – designed to spot-check numerous machines. Most all spot welding technologies can be monitored. Fixed units have comprehensive inputs/outputs that can communicate with an automated system. Weld monitors can prompt part acceptance or rejection. Portable units can assure that numbers of welders are performing to specification. Advanced portable units store results for download or analysis at a later date. A weld monitor is a traceable/calibrated instrument that can fulfill Mil Spec and ISO requirements.

The range of products is capable of reading secondary currents of 10 Amps to 500,000 Amps. All can measure RMS or Peak current. Some can measure secondary voltage up to 50 volts. All measure weld time.

Basic monitors measure current and time only. Such monitors can be used for basic AC applications. Some have special functions for capacitor discharge welding processes. Basic monitors are available in fixed or portable varieties.

Advanced monitors measure current, voltage, power, weld time, conduction angle, force and displacement. Welding data may either be displayed graphically or alpha-numerically. Graphic information can be analyzed to the finest detail. Multiple parameters can be monitored at the same time.

Advanced versions can measure force. Analog inputs can be adapted to measure a load-cell of the customer’s choice. Other monitors have weld-through sensors that measure force, weld current and secondary voltage simultaneously. By analyzing the simultaneous force/current waveform profile, you can visualize where current fires during electrode squeeze. If current is fired too early, the process is out of control. If current is fired too late, system throughput is jeopardized.

Most monitors have RS-232 or RS-485 data collection capability. Some have canned software packages available that transport weld data to an Excel spreadsheet for analysis and graphing.

If you feel you need an external monitor to assure that your process is under control, please contact us so we can fit a particular monitor to your specific needs.