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Kemppi A7 TIG Orbital System 300 Manual

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A7 TIG Orbital System 300© Kemppi Oy 2016 1615
OPERATING MANUAL
2.3 Weld head set-up
2.3.1 Assemblies
The series 300 weld head assembly consists of the
following assemblies.
Machine package including:
A. Torch mounting
B. Torch oscillation and electronic cross-seam
adjustment capability
C. Arc gap control (AGC) and torch height
adjustment
D. Wire drive and spool mount assembly
E. Torch and cable assembly
F. Weld head
G. Guide ring (optional, size according to the pipe
size)
H. Roller chain and tensioner (included in the guide
ring kit)
The vulnerable mechanisms of the machine package
assembly are completely enclosed in an aluminium
housing. Permanent magnet DC gear motors inside the
housing provides both axial and vertical torch motion.
The arc gap control (torch up/down motion) is powered
by a DC motor rotating a splined shaft which in turn
moves the torch using a geared slide assembly.
Axial torch motion cross-seam (oscillation) is provided
by a second motor through a helical cam and follower
assembly. A linear potentiometer provides axial position
feedback for both oscillation and cross seam adjustment.
Wire-drive and spool-mount assembly
• The wire-drive assembly mounts on a link arm
adjacent to the machine package that consists
of a motor, bevel gear set, and drum-and-roller-
beam assembly.
• The roller presses the wire into a U-groove on
the rotating drum, driving the wire by friction.
• The wire-spool mount attaches to the link arm
on a swing-out bracket to facilitate changing
wire spools.
• Hand-tighten the knurled knob used to retain
the wire spools to automatically apply a pre-set
drag to the spool.
Torch and cable assembly
• Three hoses and an electrical control cable
encased in a berglass-reinforced silicone
sheath with the torch permanently mounted on
one end.
• The control cable is terminated in a small
connector that mates inside the tractor
assembly.
• The machine package is cooled by interrupting
the line carrying water to the torch.
• The electrode cable is located inside the water
return line.
• A voltage sensing lead is directly attached to
the torch and provides the arc voltage signal
used for arc gap control (AGC) operation.
Weld head
The tractor propels the machine package around the
pipe.
1. Attach the tractor to the machine package by a
pair of hinge pins and a link.
2. Change the link for each pipe or guide ring size to
maintain the minimum radial prole for any pipe
size.
The tractor consists of:
• A permanent magnet gear motor driving a
sprocket that engages a chain on the guide ring
for the traction
• Aluminium housing
• A cavity where the control cable plug is mated
with the in-line receptacle to provide control
power to the tractor, machine package, and wire
drive.
Use only the correct link for a given guide ring to
ensure proper engagement of the drive sprocket teeth in
the guide ring chain. The links are labelled with the pipe or
tube size. Use them with the same size pipe or tube guide
ring.
… 11 …


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