RELATIONSHIP BETWEEN ARC SOUND AND SUBSIDENCE OF WELD BEAD IN ALUMINUM ALLOY
MIG WELDING PROCESS

SHI Yu¹  HUANG Jiankang¹  FAN Ding²  CHEN Jianhong²

(1. Key Laboratory of Non-ferrous Metal Alloys of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050;
2. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050 )

Abstract: In order to solve the problem of welding bead subsidence in aluminum alloy welding process, which is caused by strong thermal accumulating effect and always leads to serious defects in welding bead, an arc sound sensing system is built up. The wavelet methods are used to analyze the relationship between welding arc sound and subsidence of aluminum alloy MIG welding bead. The experimental results show that there is an obvious relation between the energy of arc sound signal and welding subsidence. The total energy of arc sound signal increases with the degree of subsidence of welding bead. The changing rules of the arc sounds energies varied when it is analyzed in different frequency bands. The study provides a new effective method for real-time detecting the subsidence of welding bead in aluminum alloy MIG welding process.

Key words: Aluminum alloy  MIG welding  Arc sound  Welding bead subsidence  Wavelet analysis

CLC No: TG444 TP317

国家自然科学基金(50675093)、甘肃省自然科学基金 (3ZS051-A25-029)和教育部春晖计划资助项目. Received 20061008, received in revised form 20070412