MAGNATECH 609AF0A0C0, Operating And Maintenance Instruction Manual, Page: 22 / 50

19
7.0 FUNCTIONAL DESCRIPTION - WELD HEAD
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: ALL FASTENERS USED ON THIS WELD HEAD ARE METRIC.
ALL MOTORS AND OTHER ELECTRICAL COMPONENTS ON THE
HEAD ARE OPERATED WITH 42V DC CURRENT OR LESS,
PREVENTING ANY SHOCK HAZARD.
The Pipeliner Weld Head consists of the following subsystems:
Oscillator
Torch Arc Gap Control Mechanism
Tractor
Torch Cable
Wire Feeder (WFOH and WFPP)
Spool Mount (WFOH only).
Guide Ring
7.1 OSCILLATOR
The Oscillation function is powered by a DC motor driven cross-slide.
The purpose of the oscillation mechanism is to provide both torch oscillation
(weave) and to provide a means of remotely adjusting the torch cross seam
position. Cross seam adjustment is
 1" (25mm) with a maximum oscillation
amplitude of 2" (51mm).
Two limit switches in the oscillator prevent over-travel damage in either direction. A
rotary potentiometer mounted within the oscillator module provides positional
feedback information to servo controls located in the Controller.
7.2 ARC GAP CONTROL (TORCH PROXIMITY CONTROL)
The contact tip-to-work piece distance is manually adjustable via a "JOG" switch
on the Remote Control Pendant. The vertical correction motion is produced by a
D.C. motor driven cross-slide. Two limit switches on the cross-slides prevent
over-travel damage to the mechanism in either direction. The Arc Gap Control
stroke is 2.6" (66mm).
7.3 TRACTOR
The Tractor Assembly provides mounting for the previously described
assemblies. Propulsion is accomplished by powered rollers which drive against
two V-belts mounted on the Guide Ring (or Flx-Track Patented). The permanent
magnet gear motor is mounted on a pivoting bracket. A lever is used to pivot the
motor pinion gear out of engagement with the drive gear and acts as a clutch.
Four roller bearings directly underneath the four drive/idler rollers retain the Head
on the Guide Ring. These rollers provide a load against the underside of the
steel rim of the Guide Ring, allowing positive friction propulsion of the multi-vee
drive rollers against the mating V-grooves of the Guide Ring. To mount the Head
or to adjust the Head for a different size guide ring, see Section 8.