Influence of Process Variables in Flux Cored Arc Welding of Hardfacing Deposits

Abstract

A lack of knowledge and objective data on the effects of welding process variables in the application and performance of weld deposited hardfacings has led to many past failures and a subsequent mistrust of the technology. This paper sets out, first, to review both the influence of welding process variables in hardfacing and the important characteristics and properties which determine the effective performance of a hardfacing deposit. Second, the results are presented of a full factorial experiment, which was performed in an effort to evaluate and interpret the effects of arc current, voltage, and polarity, as well as of travel speed, torch stand-off distance, and preheat, on the nature and properties of a commercial flux cored arc welded hardfacing deposit. In this programme, the effects of the welding parameters were evaluated with the aid of a number of computer analyses, with arc current, voltage, and polarity being shown to have the greatest effect: a high arc current (360 A) gives the most satisfactory deposit in terms of weld metal dilution, hardness, and porosity, as well as of both deposition rate and efficiency, provided that electrode negative arc polarity is used, together with a low (24 V) arc voltage. In attempting to achieve more cost effective use of hardfacings in abrasive wear resistant applications, both the potential of this approach and the value of the results obtained are clearly demonstrated.

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References

HENDERSON

: submitted MSc dissertation, University of the Witwatersrand, 1986.

GREGORY

E. N.

: Surfacing J., 1975, 6, (2), 5–10.

KALB

: Philips Weld. Rep., 1973, 9, (3), 13–20.

GREGORY

E. N.

: Surfacing J. , 1979, 10, (1), 6–7.

QUAAS

J. F.

: Welding J. , 1970, 49, 175–183.

JAMES

D. H.

: Surfacing J. , 1978, 9, (2), 3–8.

MURRAY

G. B.

: Surfacing J. , 1977, 8, (3), 12–16.

COOKSEN

: Surfacing J. , 1974, 5, (1), 16–17.

ELLIS

: MSc dissertation, University of the Witwatersrand, 1984.

10.

GARRETT

G. G.

, WRIGHT

G. J.

, HENDERSON

J. L.

, and ELLIS

: Proc. 1st Int. Conf. on ‘Surface engineering’, Brighton, June 1985, Welding Institute.

11.

‘Transarc, hardfacing manual’, Afrox SA (Pty) Limited, Johannesburg , 1982.

12.

GREGORY

E. N.

: Met. Constr., 1980, 12, 685.

13.

GRINBERG

N. N.

and SHTEIN

L. M.

: Weld. Prod. (USSR), 1977, 24, (8), 5–8.

14.

TARASOV

V. V.

: Automat. Weld. (USSR), 1975, 28, (3), 57–59.

15.

POKHODNYA

I. K.

.: Automat. Weld. (USSR), 1981, 34, (12), 1–4.

16.

WAHL

: Surfacing J. , 1980, 11, (1), 2–5.

17.

>‘Cobalarc: hardfacing technology seminar papers’, Afrox SA (Pty) Limited, Johannesburg, 1978.

18.

KIRCHNER

R. W.

: Weld. Des. Fabr., 1978, 51, (8), 53–55.

19.

Constr. Steelwork , Dec. 1973—Jan. 1974, 34–37.

20.

FARMER

H. N.

: Met. Eng. Q., 1975, 15, (4), 32–38.

21.

MERKULUV

B. A.

.: Weld. Prod. (USSR), 1972, 19, (12), 52–55.

22.

YUZVENKO

Yu. A.

and KIRILYUK

G. A.

: Automat. Weld. (USSR), 1974, 27, (1), 55–57.

23.

YUZVENKO

Yu. A.

: Automat. Weld. (USSR), 1972, 25, (5), 57–60.

24.

HUGGAN

: Met. Aust., 1977, 9, (1), 12.

25.

KUZNETSOV

L. D.

: Automat. Weld. (USSR), 1980, 33, (9), 47–48.

26.

LUTSENKO

V. T.

: Weld. Prod. (USSR), 1974, 21, (8), 31–34.

27.

HAZZARD

: Tribology, 1972, 5, (5), 207–214.

28.

Weld. News, Nov. 1976, (163), 18–19.

29.

LOMYGINA

V. D.

et al.: Weld. Prod. (USSR), 1978, 25, (1), 42–45.

30.

COOKSEN

: Surfacing J. , 1974, 5, (2), 9–11.

31.

BROWN

G. G.

: Met. Aust., 1977, 9, (1), 13.

32.

GREGORY

E. N.

: Surfacing J. , 1983, 14, (1), 2–8.

33.

GREGORY

E. N.

: ‘Hardfacing civil engineering plant’, ch. 11, 63–66.

34.

SHLYKOV

N. E.

: Weld. Prod. (USSR), 1978, 25, (1), 26–28.

35.

TETNEV

V. S.

and MASIN

M. M.

: Weld. Prod. (USSR), 1973, 20, (2), 42–43.

36.

DOHERTY

and McGLONE

J. C.

: ‘Relationships between process variables and weld geometry’, Research Report, (revised copy), Welding Institute, Abington, 1978.

37.

McGLONE

J. C.

: ‘The submerged arc butt welding of mild steel. Part 1: The influence of procedure parameters on weld bead geometry’, Research Report, Welding Institute, Abington, 1978.

38.

McGLONE

J. C.

and CHADWICK

D. B.

: ‘The submerged arc butt welding of mild steel. Part 2: The prediction of weld bead geometry from the procedure parameters’, Research Report, Welding Institute, Abington, 1978.

39.

DOHERTY

et al.: ‘The relationship between arc welding parameters and fillet weld geometry for MIG welding with fluxcored wires’, Research Report, Welding Institute, Abington, 1978.

40.

‘Principles of industrial welding’; 1978, Cleveland, Ohio, James F. Lincoln Arc Welding Foundation.

41.

METLITSKIE

V. A.

Automat. Weld. (USSR), 1980, 33, (6), 42–44.

42.

BELOV

V. S.

: Weld. Prod. (USSR), 1972, 19, (5), 74–75.

43.

CARY

H. B.

: Weld. Met. Fabr., 1970, 38, 458–464.

44.

KAKVEVITSKII

V. A.

and RAGUTSKIE

I. V.

Weld. Prod. (USSR), 1968, 15, (5), 44–47.

45.

NATRELLA

H. G.

: ‘Experimental statistics’ (reprint of the ‘Experimental statistics’ portion of the AMC Handbook, 1963) in ‘National Bureau of Standards Handbook’, 91; 1980, Washington, DC, Government Printing Office.

46.

HARRIS

and SMITH

B. L.

: Met. Constr., 1983, 15, 661–666.