Miyachi Unitek provides equipment for both weld monitoring, and non-destructive and destructive weld testing.

Weld monitors are devices that measure one or more specific electrical and/or mechanical parameters that dynamically change during the welding process. These measurements may include weld current, voltage drop across the electrodes, workpiece expansion and deformation, electrode force, electrode movement (displacement), size of the electrode face, acoustic energy emitted while the weld is being formed, and temperature of the workpieces. Variations in the thickness, tensile strength, hardness, surface finish and cleanliness of the workpieces have a significant effect on weld quality. Modern measurement techniques make it possible to accurately measure the energy and pressure used to make a resistance weld. Weld monitoring is effective to the extent that the electrical and mechanical measurements made during the welding process reflect the variations in the physical properties of the workpieces and the welding equipment.

Weld testers evaluate and/or control the mechanical strength of finished bonds by stressing them to the point of breakage and measuring the result.