Abstract: A fuzzy controller‚which is realized by Look-up Table （LUT） method based on MATLAB Fuzzy Logic Toolbox‚was developed to overcome the disadvantages of weak arc voltage self-adjusting ability in pulsed MIG welding with small diameter aluminum wire．In this controller‚the peak arc voltage‚Uf‚is controlled by the pulse base time‚Tb‚by means of the feedback of arc voltage．The membership functions‚fuzzy linguistic control rules and fuzzy linguistic control table of fuzzy controller were also discussed．The results of the experiment demonstrate that the newly developed fuzzy controller has strong arc voltage adjusting ability to obtain the stabilities of arc voltage and welding process．

Key words: pulsed MIG welding；power source；arc voltage adjustment；fuzzy controller