Operation Manual

12
A7 TIG Orbital System 300© Kemppi Oy 2016 1615
OPERATING MANUAL
Guide ring
The guide ring consists of:
• Two hinged segments closed around the pipe
and latch
• Two xed stainless steel "pads" mounted in
one-half of the guide ring that provide a "Vee-
block" to square the guide ring relative to the
pipe axis
• Pads dimensioned so that the guide ring is
centred on the pipe as long as the pipe is within
nominal outer diameter (OD) size range.
If the pipe is either under or oversized, do one of the
following:
• Shorten the pads.
• Use longer pads to maintain concentricity.
• Substitute pads with alternate pads to allow a
guide ring designed for a larger pipe size to be
mounted concentrically on a smaller pipe size.
Clamp the guide ring rigidly on the pipe using setscrew(s)
on the other half of the ring.
Guide rings for 8" and larger pipes are supplied as two-
piece units that are bolted together by two recessed
captive socket-head screws.
To specify guide ring kit P/N (see related charts):
• The part number for the 300-series weld head
guide rings also indicates the workpiece
diameter in inches. For example, a 2" pipe is
2.375" OD .
• If radial clearance is important for an
application, use appropriate size guide ring for
the minimum radial clearance.
• Or use a guide ring for the next smaller size
down by replacing the insert pads.
To specify guide ring insert kit P/N (see related chart):
• To use a guide ring on a smaller size pipe or
tube, substitute dierent steel pad "inserts" for
the those supplied standard. The last 3 digits of
the part number indicate the height of insert
pad in inches.
• Example: To weld a pipe 0.5" (12.7 mm) smaller
in OD. than nominal pipe size of guide ring,
0.5"/2 = 0.25" radial clearance between new
pipe OD. and guide ring. Insert should be 0.25"
in height. Therefore P/N is 102222-250 (250
standing for .250).
A longer setscrew may be required depending on the
length of the insert. This is provided if required as part of
the insert kit.
To position the guide ring:
• Place the guide ring approximately 60.00 mm +/-
1 mm from the weld joint in order to eliminate
the need for mechanical adjustments of the
head.
• Place the ring as square as possible to the weld
joint to minimize the need for torch cross seam
adjustment during the weld.
• If the guide ring is substantially misaligned
("cocked"), it may result in rubbing the bottom
surface of the head on the pipe.
Always loosen the setscrew before unlatching the
guide ring. Mount the guide ring fairly concentrically with
the pipe OD. The arc gap control system will compensate
for variations in mounting eccentricity. Remember that the
12 mm AGC stroke must be preserved to allow automatic
torch-to-workpiece corrections both within and between
passes.