Influence of filler wire addition on weld pool oscillation during gas tungsten arc welding

Abstract

The present paper reports on weld penetration control based on weld pool oscillation during gas tungsten arc welding (GTAW) with cold filler wire addition (cold wire GTAW). Experiments were carried out in which the weld pool was brought into oscillation by applying short pulses on the welding current. The frequency of the weld pool oscillation was obtained from the arc voltage variation via fast Fourier transform analysis. It was found that the weld pool oscillation approach is suitable for penetration control during cold wire GTAW when the metal transfer occurs in an uninterrupted bridging manner. Interrupted bridging transfer results in a disturbed oscillation signal due to agitation of the weld pool by mass transfer and/or oscillation of the pendant droplet.

Keywords

WELD PENETRATION CONTROL WELD POOL OSCILLATION GAS TUNGSTEN ARC WELDING ARC VOLTAGE VARIATION METAL TRANSFER

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References

Kotecki

D. J.

, Cheever

D. L.

and Howden

D. G.

: Weld. J., 1972, 51, (8), 386s–391s.

Renwick

R. J.

and Richardson

R. W.

: Weld. J., 1983, 62, (2), 29s–35s.

Zacksenhouse

and Hardt

D. E.

: J. Dyn. Syst. Meas. Control, 1983, 105, 179–184.

Xiao

Y. H.

and Den Ouden

: Proc. 3rd Int. Conf. on ‘Trends in welding research’, Gatlinburg, TN, USA, June 1992, ASM International, 423–426.

Xiao

Y. H.

and Den Ouden

: Weld. J., 1990, 69, (8), 289s–293s.

Xiao

Y. H.

and Den Ouden

: Weld. J., 1993, 72, (8), 428s–434s.

Maruo

and Hirata

: Weld. Int., 1993, 7, (8), 614–619.

and Den Ouden

: Proc. 5th Int. Conf. on ‘Trends in welding research’, Pine Mountain, GA, USA, June 1998, ASM International, 1125–1130.

Aendenroomer

A. J. R.

: ‘Weld pool oscillation for penetration sensing and control’, PhD thesis, Delft University of Technology, Delft, The Netherlands, 1996.

10.

Aendenroomer

A. J. R.

and Den Ouden

: Weld. Cutting, 2001, 53, (8), E174–E179.

11.

Wohlfahrt

, Thomas

and Weisner

: Weld. Cutting, 2001, 53, (2), 29–31.

12.

Hermans

M. J. M.

and Den Ouden

: Weld. J., 1999, 78, (4), 137s–141s.

13.

Rehfeldt

and Polte

: Weld. Cutting, 2000, 52, (10), E228–E231.

14.

Iida

and Guthrie

R. I. L.

: ‘The physical properties of liquid metals’, 71; 1988, Oxford, Clarendon Press.

15.

‘Metals handbook’, 10th edn, Vol. 1, 374; 1990, Metals Park, OH, ASM International.

16.

Friedman

: Weld. J., 1978, 57, (6), 161s–166s.