. The Bell System technical journal . SILICON-COPPERWIRE »*»-ili^*!8SaC. CUPRO-NICKELCONTACT . Fig. 19— Section of a percussion weld. Original amplification 100 X. STRENGTH ♦ --PROPORTIONAL—*! TO ARC DURATION SUITABLEMIN ARCDURATION r* • 1 1 \ : « •1 • < • • • << 1 / < 1 • / f / /( 1050V-7^ 21-30, (12-1-52) /■ 1 20 40 60 80 100 120 140 160 180 200 220 240 ARC DURATION IN MICROSECONDS Pig. 20— Weld strength versus arc duration. 920 THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1954 1800 volts) just before the parts touch. The arc initiates itself whenthe gap has been red
. The Bell System technical journal . SILICON-COPPERWIRE »*»-ili^*!8SaC. CUPRO-NICKELCONTACT . Fig. 19— Section of a percussion weld. Original amplification 100 X. STRENGTH ♦ --PROPORTIONAL—*! TO ARC DURATION SUITABLEMIN ARCDURATION r* • 1 1 \ : « •1 • < • • • << 1 / < 1 • / f / /( 1050V-7^ 21-30, (12-1-52) /■ 1 20 40 60 80 100 120 140 160 180 200 220 240 ARC DURATION IN MICROSECONDS Pig. 20— Weld strength versus arc duration. 920 THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1954 1800 volts) just before the parts touch. The arc initiates itself whenthe gap has been reduced to a few thousandths of an inch. A portion ofthe abutting surfaces of both the wire and the contact base metal(normally inch to inch) are melted and expelled in liquid andgaseous states before the molten surfaces are forced together. The arc isextinguished when it can no longer melt and expel metal to maintaina gap. Under good operating conditions it persists from to milli-seconds. Nearly all of the heated metal is exp
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
