Improvements in or relating to the welding of metal sheathed electric cables

1,105,376. Arc welding systems. BRITISH INSULATED CALLENDER'S CABLES Ltd. 27 Jan., 1967 [28 Jan., 1966], No. 3906/66. Heading H2H. [Also in Division B3] In sealing an end of a metal sheathed mineral insulated cable by arc ; welding, a high frequency initiated timer-controlled D.C. preheating st...

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Bibliographic Details
Main Authors EDWARDS ROBERT, PAGE SIDNEY
Format Patent
LanguageEnglish
Published 06.03.1968
Subjects
CLADDING OR PLATING BY SOLDERING OR WELDING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
SOLDERING OR UNSOLDERING
TRANSPORTING
WELDING
WORKING BY LASER BEAM
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Summary:1,105,376. Arc welding systems. BRITISH INSULATED CALLENDER'S CABLES Ltd. 27 Jan., 1967 [28 Jan., 1966], No. 3906/66. Heading H2H. [Also in Division B3] In sealing an end of a metal sheathed mineral insulated cable by arc ; welding, a high frequency initiated timer-controlled D.C. preheating step is followed by a D.C. welding step and the timer is set in operations by the striking of the preheat arc. The seal is effected by melting the end of the sheath or by welding a cap to the end of the sheath. Actuation of a switch S1A, S1B connects a high frequency unit across the electrode E and the sheath W and energizes welding relay RC. When the preheat arc strikes, relay R responds to the arc current to set the preheat timer TA. At the end of the preheat period, timer TA sets the weld timer T and energizes relay B to shunt a resistance RX2 to increase the arc current. At the end of the welding period, timer T releases the welding relay RC. If the arc fails during the preheat period relay R falls back to reset the preheat timer TA.
Bibliography:Application Number: GB19660003906