Extract periodic parameters of GMAW electric signal with short-circuit transition craft based on LabVIEW

Traditional parameter extraction method is to use Analysator Hannover or it’s development,the previous extraction methods is hard to operate and easily go error by noise in LabV IEW. In this paper,based on the LabV IEW pulse measurement function and centered on the ends of a short circuit voltage signal,the corresponding current waveform with a certain range was checked whether it’s maximum value was less than the threshold value as the standard,and was determined whether it was an instantaneous short circuit. The measurement function was made into a sub vi. In order to improve the program structure and human-machine interaction,JKI state machine was used to design a concise human-machine interface with U-PDD and I-PDD as assistants. By selecting the appropriate reference level and threshold current,variation diagram and frequency diagram of short circuit time,short circuit cycle time,frequency diagram and it’s variation coefficient were measured.Experiments showed that this method could accurately measure the required results.