Arc voltage sensor for monitoring of penetration in TIG welds

Author

Bicknell, A. ; Smith, J.S. ; Lucas, J.

Author_Institution

Dept. of Electr. Eng. & Electron., Liverpool Univ., UK

Volume

141

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

513

Lastpage

520

Abstract

This paper describes the development of an arc voltage sensor for the measurement of the degree of penetration in tungsten-inert gas (TIG) welds. It is shown that the rate of change of the are voltage is directly related to the rate of movement of the weld pool surface. Weld penetration occurs when the surface of the weld pool falls. The sensor also detects the frequency of induced weld pool oscillations, which occur in one of two well defined modes according to the degree of penetration present. Spectral analysis of the voltage data, using the fast Fourier transform (FFT), provides a means of measuring weld bead size once full penetration has been detected. The sensor may be used to give closed loop computer control of bead size by varying the welding parameters

Keywords

arc welding; electric sensing devices; fast Fourier transforms; process computer control; spectral analysis; FFT; TIG welds; W; arc voltage sensor; bead size; closed loop computer control; fast Fourier transform; spectral analysis; tungsten-inert gas welds; voltage data; weld bead size; weld pool surface; welding parameters;

fLanguage

English

Journal_Title

Science, Measurement and Technology, IEE Proceedings -

Publisher

iet

ISSN

1350-2344

Type

jour

DOI

10.1049/ip-smt:19941144

Filename

331574