USE OF AUDIBLE SOUND FOR ON-LINE MONITORING OF GAS METAL ARC WELDING PROCESS

In this paper sound generated during the gas-metal arc welding process was studded. Experimental analyses of the acoustic signals have shown that there are two main noise-generating mechanisms, first having impulse form is arc extinction and arc ignition; the second is the arc itself acting as an ionization sound source. The sound signal is used for assessing and monitoring of the welding process, and for prediction of welding process stability and quality. A new algorithm based on the measured welding current was established for the calculation of emitted sound during the welding process. The comparisons have shown that the calculated values are in good agreement with the measured values. ~ujni zvuk, koja se generira kod procesa elektrolu~nog zavarivanja po MAG postupku. Eksperimentalna analiza zvu~nog signala je pokazala, da se javljaju dva glavna mehanizma generiranja zvuka, prvi, koji ima karakter impulza, je posljedica paljenja i ga{enja elektri~nog luka (plazme); drugi je sam elektri~ni luk, koji djeluje kao ioniziraju~i izvor zvuka. Zvu~ni signal je upotrijebljen za ocjenjivanje i nadzor procesa zavarivanja, te za ocjenjivanje kvalitete i stabilnosti procesa zavarivanja. Razvijen je novi matemati~ki model za izra~un emitiranog zvuka kod procesa zavarivanja a koji bazira na izmjerenoj struji zavarivanja. Usporedba izra~unanih i izmjerenih vrijednosti zvu~nog signala je pokazala veliku suglasnost.