Operation
By turning the
central
actuating handle, two sets of conical fingers
are drawn together forcing the backing ring segments radially into the bores of the pipes to be aligned.
Strong clamping
forces hold the pipes firmly in close
abutment permitting welding to take place without the
need for tacking. Pipes
with wall thickness up to
5% of
pipe diameter are rounded and pipes up to 12
Metres
in length can be welded by adding standard extensions.
Backing Ring Segments
Standard replaceable backing ring segments are made
of stainless steel.
Gas Purging
Argon or Helium purging gas is fed
into the purge gas
manifold and distributed through gas
pipes to each
individual segment. Purge gas is
concentrated at the
underside of the weld, purging is rapid
and welding can start immediately. Low gas flow rate
and pressure avoids blow back and 1-2 lit/min is sufficient
to provide shielding.
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