Transactions . and crumbled to pieces at bright yellowunder the drop hammer Metallic copper showed on the surface ofthe heated ends when cold. A5—The ends did not stick at any heat, resisted all attempts toweld; copper showed on the surface of the heated ends as in A4. The failure to weld the steels containing the higher proportions ofcopper may have been due to the formation of a film of copper oxideupon the surface of the weld. Test pieces were turned from the welded specimens and the ulti-mate breaking strength of these determined, with the results givenbelow: Ultimate Breaking Strength Ult
Transactions . and crumbled to pieces at bright yellowunder the drop hammer Metallic copper showed on the surface ofthe heated ends when cold. A5—The ends did not stick at any heat, resisted all attempts toweld; copper showed on the surface of the heated ends as in A4. The failure to weld the steels containing the higher proportions ofcopper may have been due to the formation of a film of copper oxideupon the surface of the weld. Test pieces were turned from the welded specimens and the ulti-mate breaking strength of these determined, with the results givenbelow: Ultimate Breaking Strength Ultimate Breaking of Welded Test Pieces. Strength of Unannealed Pounds per Square Inch. Test Pieces. Bar. Pounds per Square Inch. AO 86,700 25,500 99,500 88,200 99,000 Al 83,000 97,400 A2 : 39,600 120,660 A0 broke along the weld. broke along the weld. broke along and across the weld. Al broke along and across the weld. A2 broke along the weld. 528 THE INFLUENCE OF COPPER UPON Fig. l\-\v elded Specimens after Fk AciriJF. THE INFLUENCE OF COPPER UPON STEEL. 529 Fig. 2 is a photographic view of the welded specimens afterfracture. Different authorities do not agree as to the limit of copper contentbeyond which the steel is not capable of being welded. The most remarkable welds of copper steels were those made byColby 13 upon steels containing in most cases about per copper. All his specimens were said to be capable of being suc-cessfully welded, and only one of them broke at the weld and thisunder a load of 61,630 lb. per square inch. Definite conclusions in regard to the welding of copper steel cannotbe drawn from the small number of results which we are able to pre-sent; but our results, together with those of Colby, would seem toindicate that it might be possible that steel containing from per cent, of copper, while more difficult to weld, when once weldedseems to produce a stronger union than a similar steel containing
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
