Electric heating – Metal heating – By arc
Patent
1995-11-30
1998-03-10
Shaw, Clifford C.
Electric heating
Metal heating
By arc
B23K 912
Patent
active
057264171
DESCRIPTION:
BRIEF SUMMARY
The invention is relative to a device for welding a weld-on part to a base part which device comprises a handling device with a holding device guided by a tool arm of the handling device for grasping and positioning the weld-on part on a determinable weld-on position of the base part, as well as such a method.
Such a device and method are known from DE patent 34 34 746. It provides that a holding device attached to a tool arm of the handling device grasps a weld-on part held ready in a parts magazine which weld-on part is provided on its side facing the base part with bulges or tips for a locally limited transfer of current onto the base part. This weld-on part is then positioned by the handling device on the preprogrammed welding-on position on the base part. The weld-on part is then placed under current by means of an electrode provided in the holding device arranged in the tool arm of the handling device so that meltings sufficient for fixing the weld-on part occur at the contact positions between the weld-on part and the base workplace. After the fixing of the weld-on part on the base part the holding device is placed in a tool magazine and a welding gun is taken in its place with which gun the welding process following this tack weld is carried out in a program-controlled manner.
The arc stud welding process used in the known method and with the known device has a number of disadvantages: For the one, the position of the tack weld point is dependent on the geometry of the two parts to be connected: In order to form the arc required for welding it is indispensably necessary, as has already been described above, especially for rather large surfaces, that the weld-on part comprises projections such as e.g. bulges or tips on its side facing the base part. The formation of such ignition tips has a decisive influence on the welding result to be achieved so that the ability of the known method and of the known device to be used is limited in a disadvantageous manner from the beginning to such weld-on parts which have ignition tips. Moreover, this tip ignition method has the disadvantage that the weldings which can be performed with it can be executed in some instances only in an uneven manner and not over the entire surface of the weld-on part. In addition, a welding of workplaces with great contact surfaces or with a heavy weight is not possible.
Moreover, the known device allows the weld-on part and the base part to be welded by means of the so-called lift ignition method. This method provides that after the weld-on part has been placed on the base part the former is lifted off from the latter and an arc is ignited with simultaneous cutting in of a welding current. Then, the maximum welding current is applied in the uppermost lift position and the two welding parts are locally melted by the arc. After an adjustable period in the millisecond range the weld-on part is let loose from the holding device and dips into the melting bath on the base part, wherewith the tack weld has been carried out. Such a lift welding method has the disadvantage that the direction of lift must always take place in the direction of gravity in order to be able to carry out the dipping of the weld-on part, effected by the force of gravity, into the melting bath on the base part. Thus, since a welding in any spatial orientation desired is not possible, provision is made in the case of the known device that the base part is brought into a suitable position. Such a method of procedure is difficult to carry out in the case of large base parts and moreover limits in a disadvantageous manner the geometry of the base parts which can be welded with the known method and the known device.
A further disadvantage of the known method and of the known device is that after the tack weld step has been carried out the holding device grasping the weld-on part is placed in a tool magazine and a welding gun must be taken into the tool arm of the handling device in order to carry out the welding-on process. This additional method step is time-consuming
REFERENCES:
patent: 2930883 (1960-03-01), Adamec et al.
patent: 3215812 (1965-11-01), Smith
patent: 3501612 (1970-03-01), Denis
patent: 3754114 (1973-08-01), Peyrot
patent: 3841547 (1974-10-01), Bartley
patent: 4883939 (1989-11-01), Sagi
patent: 4952773 (1990-08-01), Orsos et al.
Claussen Carsten M.
Ilch Hartmut
Nath Gary M.
Shaw Clifford C.
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