Reactions; A Quarterly Publication Devoted to the Science of Aluminothermics Volume 7-9

Reactions; A Quarterly Publication Devoted to the Science of Aluminothermics Volume 7-9

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...from contracting if the clamps are effiicient, although actually allowing 1/8 in. or 14 in. for this contraction. I have known of one particularly bad case of "preventing contraction" in which an experienced 'Superintendent Goldschmidt Thermit Co. operator jacked a heavy steel section of a rudder frame apart to allow for contraction in a broken rib 8 in. x 4 in. and then proceeded to ram the jack up in the mold box. The result, of course, was that the section cracked alongside of the Thermit weld and the jack had to be cut in two in order to remove it. But in crankshaft welds the usual result of efficient clamping to keep the pieces in line will be the formation of holes in Goldschmidt Thermit Company Power Derailing Rail Grinder Grinding Welded Rail Joints THERMIT RAIL WELDING BY THE INSERT METHOD IN CHICAGO, ILL. the weld which in all probability will be blamed on the Thermit, a new crucible, the breaking down of the mold or to other similar causes. Such holes can usually be easily distinguished from ordinary blow holes by the fact that their axes run parallel, or nearly parallel, to the line of the contraction which, in the case mentioned above, is the axis of the shaft. To show how prone operators are to make this mistake, I might mention one experience where an operator who would carefully release the clamps to allow for the contraction of a shaft weld, neglected to do so in welding a small trunnion on the end of a heavy steel cross-head. This trunnion was defective and was replaced by welding a piece of 5 in. shafting onto the cross-head. The cross-head was laid on a bed plate and the trunnion was set up in position on a supporting block and strongly clamped in place. The mold was rammed and the weld poured in more

Product details

  • Paperback
  • 189 x 246 x 4mm | 163g
  • United States
  • English
  • black & white illustrations
  • 1236952510
  • 9781236952516