Resistance (mash) seam welding: Influence of welding conditions on tin distribution

Abstract

Mash seam welding involves the rapid production of a continuous weld seam by means of overlapping resistance spot welds. The applicability of the process is known to be dependent on the properties and structure of the welded materials, and for steel can production, is almost always applied to tin coated steels. In the present work, the authors report on an experimental investigation of the influence of welding conditions on tin distribution at and close to the bond interface and discuss the role of the tin coating in the welding process. It is shown that for acceptable welding conditions, tin is either intermittently present on the bond line at lower currents in the range of acceptable welding currents and is absent at higher currents within this range; the majority of tin being extruded to the side of the joint during welding. The tin layer acts both as a protection against corrosion and as an electrical contact medium during the initial stages of the welding process. It is concluded that the displacement of the tin during welding is a sufficient but not a necessary condition for acceptable joint formation.

Keywords

MASH SEAM RESISTANCE WELDING CAN MANUFACTURE TIN PLATE TIN DISTRIBUTION WIRE MASH SOLID STATE

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References

Norman

G. F.

: Proc. 1st Int. Tinplate Conf., London, UK, October 1976, International Tin Research Institute, 239–248.

Sodeik

, Täffner

and Weber

: Trans. Iron Steel Inst. Jpn, 1988, 28, (8), 663–671.

Gregory

, Szczur

and Squires

: Proc. Int. Conf. on ‘Art and science of welding’, Auckland, New Zealand, October 1985, New Zealand Institute of Welding, 75–82.

Sodeik

: Proc. 2nd Int. Tinplate Conf., London, UK, October 1980, International Tin Research Institute, 161–175.

Silbereis

: Tin Int., 1986, 59, (7), 241–243.

Klärner

: Umformtechnik, 1991, 25, (2), 57–65.

Gould

J. E.

: Weld. J. Res. Suppl., 2003, 82, (10), 263s–267s.

Funk

E. J.

and Bergeman

M. L.

: Weld. J. Res. Suppl., 1956, 35, (6), 265s–274s.

Williams

N. T.

, Thomas

D. E.

and Wood

: Met. Constr., 1977, 9, (4), 157–160.

10.

Williams

N. T.

, Thomas

D. E.

and Wood

: Met. Constr., 1977, 9, (5), 202–204, 206–208.

11.

Waddell

, Thomas

D. E.

and Williams

N. T.

: Met. Constr., 1986, 18, (3), 156–161.

12.

Blom

A. H.

: ‘Tin layer behaviour and microstructural development during high speed resistance mash seam welding of tinplate packaging steel’, MSc thesis, Delft University of Technology, Delft, The Netherlands, 2006.

13.

Milner

D. R.

and Rowe

G. W.

: Metall. Rev., 1962, 7, (28), 433–478.

14.

Tylecote

R. F.

: ‘The solid phase welding of metals’; 1968, London, St. Martin's Press.

15.

Gould

J. E.

: ‘Joining of advanced and specialty materials’, 89–97; 2001, Materials Park, OH, ASM International.

16.

Mohammedand

H. A.

J. Washburn: Br. Weld. J. Res. Suppl., 1975, 54, (9), 302s–310s.

17.

Nikitin

A. S.

: Weld. Int., 1998, 12, (11), 904–906.