General Information on Track Circuits - RGS Online

Railway Group Approved Code of Practice
GK/RC0752
Issue Two
Date December 1998
Page E8 of 52
Withdrawn Document
Uncontrolled When Printed
<strong>General</strong> <strong>Information</strong> on Track Circuits
8.3 Pin Brazing
Pin brazing is a method of connecting threaded pins to the rail using electric–arc
brazing. This method will usually be used at new sites or where re–railing takes
place and may be used on standard and hardened steel rails. Pin–brazed studs
will be installed by Signal or Permanent Way Engineering staff; any person
engaged in these operations must hold a Certificate of Competency for the task
to be undertaken.
An M12 pin brazed stud may be brazed to the rail web, as shown in Figure E5.
The minimum spacing between connectors is 85mm. The correct torque for
attachment of the rail lug to the M12 studs is 60Nm.
NOTE
Self Locking Nut (Supplied) to be
tightened to a torque of 60Nm
200 240
E 8 R A I L T R A C K
115
Pin Brazed TEE Connector
Figure E5
The threaded pins are brazed to the rail, at a position 57±2mm above the base
of the rail, with a silver based filler metal, using a hand held brazing gun operated
by either of the following pieces of equipment:
Description Catalogue No.
Portable machine, battery driven on single
rail trolley, suitable for track maintenance,
which will braze approx. 50 pins to the rail. : 20/3003
Large machine, battery driven on double rail
trolley. The batteries are recharged by an
integral petrol driven generator. This unit has
a capacity for 50 brazes per hour and is
suitable for new works. : 20/3001
57