Bedienungsanleitung Kemppi A7 TIG Orbital System 300 (Seite 11 von 61) (Englisch)

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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.

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