Relationship between geometrie welding parameters and optical-acoustic emissions from eleetrie are in GMAW-S proeess

• Autorzy: Cayo E. H. , Alfaro S. C. A.
• Języki publikacji: EN

Abstrakty

EN

Purpose: Show the relationship between geometrie characteristics of the weld bead and the optical-acoustic emissions from electric arc during welding in the GMAW-S process. Design/methodology/approach: Bead on plate welding experiments was carried out setting different process parameters. Every welding parameter group was set aiming to reach a high stability level what guarantee a geometrical uniformity in the weld beads. In each experiment was simultaneously acquired arc voltage, welding current, infrared and acoustic emissions; from them were computed parameters as arc power, acoustic peaks rate and infrared radiation rate. It was used a tri-dimensional LASER scanner for to acquire geometrical information from the weld beads surface as width and height of the bead. Depth penetration was measured from sectional cross cutting of weld beads. Findings: Previous analysis showed that the arc emission parameters reach a stationary state with different characteristic for each experiment group which means that there is some correlation level between them. Posterior analysis showed that from infrared parameter is possible to monitoring external weld bead geometry and principally its penetration depth. From acoustic parameter is possible to monitoring principally the external weld bead geometry. Therefore is concluded that there is a close relation between the arc emissions and the weld bead geometry and that them could be used to measuring the welding geometrical parameters. Research limitations/implications: After analysis it was noticed that the infrared sensing has a better performance than acoustic sensing in the depth penetration monitoring. Infrared sensing also sources some information about external geometric parameters that in conjunction with the acoustic sensing is possible to have reliable information about weld bead geometry. This method of sensing geometric parameters could be applied in other welding processes, but is necessary to have visibility of the arc, it means that for example this method cannot be used in the submerged arc welding - SAW process. Originality/value: The using two or more sensors for monitoring welding parameters increases the performance and reliability of the measurements. In this case, the monitoring of the weld bead geometric parameters could be possible from sensing arc emission and potentially it could be used as an on-line monitor, avoiding any complex electric connections of sensors into the welding process.

Słowa kluczowe

EN

monitoring; arc emissions; geometrical parameters; weld bead; GMAW-S

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2011
• Tom: Vol. 46, nr 1
• Strony: 79--87
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Cayo E. H.

• Mechanical/Mechatronic Engineering Department, University of Brasilia, Campus Universitário Darcy Ribeiro - Asa Norte 70.910-900, Brasilia - DF - Brazil

autor

Alfaro S. C. A.

• Mechanical/Mechatronic Engineering Department, University of Brasilia, Campus Universitário Darcy Ribeiro - Asa Norte 70.910-900, Brasilia - DF - Brazil

Bibliografia

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