Spot Welder Quality And Nugget Quality Analysis

The electric parameter monitoring of spot welding quality of spot welding machine is the most commonly used control method now. It has the advantages of convenient sampling and does not need messy sensor system. Common control methods include constant voltage method, constant current method, energy integration method and dynamic resistance method.

Spot welding machine welding current or current density, voltage between electrodes, dynamic resistance, energy, and electrode displacement can all be used as monitoring information. However, because the characteristics of each type of information are different, and the monitoring methods and habit sizes are also different, the role of monitoring is also quite different. In the spot welding process of the spot welder, it is necessary to satisfy the following basic conditions before it can be used as information for quality monitoring.

It is necessary to have a close relationship with the quality of the joint, a certain functional relationship and promising accuracy; it must be large enough to not be swallowed by the environment; it must be able to reproduce, generally it should be consecutive; obtain monitoring information (Including equipment) should not affect the normal production process; the required testing methods are simply completed, and the cost must not be too high.

The strength of the spot welder of the spot welder is determined by the size of the nugget and its surface quality. The size of the nugget generally requires the nugget diameter to increase with the thickness of the plate.