Weld transference modes identification through sound pressure level in GMAW process

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

Abstrakty

EN

Purpose: One of the most used processes in the industry is GMAW, in this welding process there is physical phenomena such as the temperature, electromagnetic field, luminosity and sound pressure. It is known that GMAW weld specialized techinicisian combine visual and sound at the work to garantee the process stability. It is important to improve the final weld quality; therefore, the quantification of electrical and acoustical behaviour-within the audible bands, offer an information that is important to comprehend his impirical rules. Design/methodology/approach: With these he can identify the transfer mode, instabilities in the process, determine defects and evaluate the weld quality along the weld bead. The sound signal is captured simultaneously with the arc voltage and current signals. Was proved that first derived from the instantaneous power of the electrical arc presents a behaviour similar to the acoustical with a delay, because the measured sound is airborne. Findings: This relation was corroborated by the comparison between the sound pressure level calculated by electrical signals and by acoustical signals. This relation presented a similarity between the calculated signals greater than that between the sound and the power first derived. Practical implications: Besides that, with the sound pressure level it is possible to identify process instabilities that is not so trivial to realize with the sound pressure signal. In spite of it, the identification of instabilities for the globular and spray tranfer modes displays greater difficulty than that for the short circuit transfer mode. It was shown that the acoustical weld sensing offers information about the behaviour of the tranfer mode and the process stability. Originality/value: The sound quantification would be applied as a control variable for the weld process. Thus, it would be possible to develop similar control strategies as those applied by specialized workers.

Słowa kluczowe

EN

GMAW; sound pressure; weld quality; airborne; acoustic sensing

PL

ciśnienie akustyczne; jakość spoin

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 29, nr 1
• Strony: 57--62
• Opis fizyczny: Bibliogr. 20 poz., il., tab., wykr.

Twórcy

autor

Cayo E. H.

autor

Absi Alfaro S. C.

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

Bibliografia

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