Electric Welding: A Comprehensive Treatise on the Practice of the Various Resistance and Arc ... by Douglas Thomas Hamilton Erik Oberg

Author:Douglas Thomas Hamilton, Erik Oberg
Language: eng
Format: epub
Publisher: The Industrial press ; [etc., etc.]
Published: 1918-03-25T05:00:00+00:00

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SPOT-WELDING

129

ing of very thick work which it would be impossible to spot-weld because of the fact that the metal could not be brought into close contact without applying enormous pressure. By this method, a. button of metal of tht same material as that being welded is lield on the top or bottom electrode or on both, as the case may

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Fig. 30. Diagram illuBtrating Various Processes employed in welding Two Sheets of Steel by means of Buttons

be; then the two pieces to be welded are placed between these buttons and pressure is applied on top of the button. The current is then turned on and the buttons localize the current, resulting in the metal being fused at the point where the buttons are located; when pressure is applied, the partially molten buttons are forced through the already molten metal and a

ELECTRIC WELDIXG

perfect junction is made. Several applications of this process are shown in Fig. 30: A shows one method where two buttons are used; B, one button; C, a case where one button is used to perform a lap-weld; D, a combination of button- and point-welding (this is a special process and is seldom used); E, a case

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