Abstract: The characteristic parameters and their statistical regularity in the CO2 arc welding droplet short-circuiting transfer are studied. The results show that the sensitivity of each characteristic parameter with the change of the short-circuiting transfer process is different. The sensitivity of some characteristic parameters is more intense than the one of the short-circuiting transfer frequency. In order to take into account the synthetic influence of all characteristic parameters, by means of the characteristic parameters synthetic value, a quantitative evaluation function is built up to describe and real time evaluate the short-circuiting transfer process of CO2 arc welding. The testing and evaluation results show that the evaluation function can give a suitable synthetically valuation for the short-circuiting transfer process with a variety of welding variables.

Key words: Characteristic parameters, CO2 arc welding, Droplet transfer, Quantitative evaluation