Electric heating – Metal heating – By arc
Patent
1982-04-26
1984-08-21
Envall, Jr., Roy N.
Electric heating
Metal heating
By arc
21912511, 219 602, B23K 928
Patent
active
044671750
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an adjustment assembly for the rotary torchhead of an electrical welding gun.
Such welding guns are used for welding pipes, the torchhead generally rotating about the pipe axis. In order that the welding electrode can be adjusted to the pipe diameter relative to the rotation axis of the torchhead, the torchholder which carries the welding electrode and optionally its inert gas nozzle, is transversely adjustable by means of a cross slide rotatable with the torch head for the radial adjustment of the welding electrode. To enable the setting angle to be adjusted with respect to the weld it is possible to swivellably adjust the torchholder with the welding electrode about an axis at right angles to the adjustment direction of the cross slide and the rotation axis of the torchhead. The welding electrode torchholder must also be axially adjustable in order to regulate the electrode spacing from the weld. Furthermore welding guns for welding with a welding filler wire also have a welding wire nozzle issuing at the electrode tip, which is adjustable with the same adjustment directions as the electrode and is also swivellably adjustable relative to the latter about an axis which is perpendicular thereto, so that the filler wire can, as required, be supplied with a different spacing laterally of the electrode tip.
To ensure that the adjustment assembly which realizes all these adjustments does not become too complicated and badly arranged in known welding guns of the aforementioned types the adjustment devices for the torchholder and of the filler wire nozzle are operationally separated from one another. However, this means that the filler wire nozzle must be separately reset following every adjustment of the torchholder.
The invention solves the problem of providing an adjustment assembly which only requires a minimum number of adjustment devices for the torchholder and the filler wire nozzle and on which no separate resetting of the filler wire nozzle after an adjustment of the torch holder is required, but is possible for modifying the relative position of the said nozzle with respect to the welding electrode.
Since, according to one aspect of the invention, the swivel holder of the filler wire nozzle is supported in a swivellably adjustable manner on the torch holder and the latter is in turn swivellably adjustable about its swivel axis, is longitudinally adjustable in the axial direction of the welding head and transversely adjustable in the radial direction of said head, all three adjustment movements are transferred to the filler wire nozzle, so that resetting thereof, except for modifying its relative position from the welding electrode is unnecessary. In most cases the filler wire nozzle remains in the same relative position to the welding electrode once it has been fixed for comparable, repeating welding functions. The invention simplifies adjustment and this operation can be carried out in a significantly shorter time. As the welding electrode and filler wire nozzle are adjusted together, the precision of adjustment is also increased, which in turn improves the welding quality. Furthermore, as in connection with the filler wire nozzle there are no separate adjustment devices for the radial adjustment, axial adjustment and swivelling adjustment in the case of a constant relative position of nozzle and electrode, the adjustment assembly can be easily supervised, can be given a compact constructional size and can be housed in a readily accessible manner in the confined space of a welding gun head, whilst at the same time being easy to operate.
As a result of employment of a spring, the bearing play of all the adjustment devices in the axial direction is substantially eliminated, so that the precise reproducibility of the adjustment processes is assisted. The spring is formed by the wire guide tube which can be resiliently bent outwards and in this way passes within the hollow shaft portion of the drive shaft and can follow all the adjustments of the adjustment assembly, it is
REFERENCES:
patent: 3621182 (1971-11-01), Peyrot
patent: 3754114 (1973-08-01), Peyrot
patent: 4072828 (1978-02-01), Thome
patent: 4292495 (1981-09-01), Saito et al.
Geiss Josef
Reeh Holger
Envall Jr. Roy N.
Mathilde Reeh
Sigda Catherine M.
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