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Practical Electric Welding

Practical Electric Welding


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About the Book

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. 1919 edition. Excerpt: ...as possible. In striking the arc by touching the electrode upon the work, we have virtually a dead short circuit which, although only momentarily, would produce serious effect owing to the high current passing, there being very little resistance in the circuit. The high current taken would impose a F IG. 37.--Motor generator for constant voltage welding. (Mel_ Malsley, Lt-) great strain upon the generator or the supply mains and would probably operate the automatic overload circuit 'breakers or melt fuses. Further, there would be an increased tendency towards sticking in the case of the metallic electrode which, if it occurred, would prolong the duration of the short circuit and increase the seriousness of the situation. It is, therefore, always necessary to include in the circuit of the electric arc some device which will limit the amount of current passing to a safe value, either on striking the arc or should the operator accidentally make a short circuit or unduly shorten his arc while at work. This limiting device may take several forms, but that most commonly used consists of a resistance placed in series with the arc and passing the same current. We find this resistance used in direct current arc lamps working in parallel on constant voltage circuits, either singly or for two or more in series. This resistance is often miscalled a steadying resistance or stabiliser, but its real function is that of a current-limiting device. It is true that in arc lamps, _having series and shunt regulation coils, the action of the latter depends upon the presence of the resistance for, were it not present, there would not be suflicient rise of voltage across the terminals to produce the increasing pull due to the shunt solenoid. However, as stated, .


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Product Details
  • ISBN-13: 9781234086527
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1234086522
  • Publisher Date: 14 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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