Letter | Published:

Surface Hardening of Metals by Spark Discharge

Abstract

THE local hardening of sparked metal is described by Welsh1 as relying upon transfer from the electrode and/or contamination by the surrounding medium. When discussing these hardening and etching effects in ferrous metals it was mentioned2 that Rawdon3 obtained them even when electrolytic iron was self-sparked in vacuo or in argon. In these cases there would be no transfer, and the only contamination might be from any hydrogen in the electrolytic iron.

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References

  1. 1

    Welsh, N. C., Nature, 181, 1005 (1958).

  2. 2

    O'Neill, H., T. Inst. Welding, 9, No. 1, 3 (1946).

  3. 3

    Rawdon, H. S., Trans. Amer. Inst. Min. Met. Eng., 70, 37 (1924); and private discussion (1930).

  4. 4

    Sears, G. W., and Brenner, S. S., Metal Progress, 70, No. 5, 85 (1956).

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