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A7 TIG Orbital System 150
© Kemppi Oy 2016
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1.3.2 Collets
Collets are used for clamping the weld head on the tube
or fitting to be welded. Collets always come in pairs, and
they are mounted on the hinged collet frame with screws.
Collets are specified by:
• Weld head model
• Outer diameter (OD) of the tube or pipe.
Two types of collets are available: flush and extended.
1.3.3 Collet frame and collets
The collets mount in the weld head and are used to clamp
the head on to the tube or fittings to be welded.
• The collet frame swings open on a hinge and is
held closed using two latches on either side of
the head.
• Both sides of the collet frame open and close
independently.
• This allows one tube (or fitting) to be clamped
in place and the second tube (or fitting) to be
butted tightly to the first clamped tube before it
is clamped.
Above function is solely to keep the head from moving
during welding, and it should not be used as a substitute for
external alignment fixtures, clamps, or tack welding to hold
the workpieces aligned.
Each collet pair consists of two half-circle pieces that are
mounted on both sides of the hinged collet frame using
screws (see images below).
The collet frame and collets are connected to the work (+)
lead of the torch cable, and a separate return lead is not
needed.
Collet sets must be ordered separately. One weld head
requires two pairs of collets (1 set = two pairs).