Elementary Forge Practice; A Text-Book for Technical and Vocational Schools

Elementary Forge Practice; A Text-Book for Technical and Vocational Schools

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ... y2 inches in diameter, as smaller stock bends while the pieces are being driven together in the fire. The Jump Weld is one ordinarily used by shipsmiths on marine or ship work. Its applications are numerous, but its main principle is the joining of one end of round, square, or rectangular stock to some point on the side of a piece of stock of the same or of a different size. In making the "jump," shown at A in Fig. 40, the end of the stock is brought to the welding heat and hammered on the sides, to prevent it from bursting while scarfing it. If the piece is a short one, the scarfing may be done by standing it on end on the anvil and hammering the hot end so as to form a flange, similar to the one shown at A. If this piece is to be "jumped," or welded, to a piece of flat stock, the latter must be made thicker, where the joint is to be, in order to allow for hammering. This can be done either by upsetting the flat stock or by forging it from a thicker piece. An indentation is made at this point with a bob-punch, as shown at B, to accommodate the flanged end on the "jump." The two pieces are generally brought to the welding heat in separate fires. The flat piece is then placed on the anvil and the "jump" in position on it. The end of the "jump" is struck with a sledge, and the flange quickly welded down with a top-fuller, making the joint appear as shown at C, Fig. 40. The Split Weld is used for welding together the ends of thin stock, such as brake-bands and sheet steel. If an ordinary lap weld were used for this purpose, the time lost in getting the scarfed ends in position for welding would permit thin stock to cool, making welding difficult: With the split weld the scarfs are in position when...show more

Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236556933
  • 9781236556936