Electric heating – Metal heating – By arc
Patent
1986-07-10
1987-12-22
Shaw, Clifford C.
Electric heating
Metal heating
By arc
B23K 908
Patent
active
047148187
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a National Phase application corresponding to the international application PCT/EP85/00506 filed Oct. 1, 1985 and based, under the International Convention, upon a German National application No. P34 36 633.4 of Oct. 5, 1984.
FIELD OF THE INVENTION
The invention relates to a device for welding metallic parts with tubular cross section with an electric arc moved magnetically along a closed weld seam line, lying in one plane, having at least two magnets with the same polarity surrounding the seam line annularly, with their pole surfaces.
BACKGROUND OF THE INVENTION
Such magnets with their respective wheel pieces are utilized to control the arc generated between two workpieces which are welded together along an annular weld seam. These magnets are arranged, as a rule, radially with respect to the weld seam line, as for instance, in the arrangement according to German Pat. No. 30 18 199, (see U.S. Pat. No. 4,436,980). Their respective magnetic cores, each carrying a coil, have on each of their ends facing the seam line a curved recess, following the course of the seam line by covering the same almost completely, and bearing the pole faces.
In such devices for the magnetic arc welding, the pole faces form a cylindrical surface surrounding the weld seam. The shape of the cross section of this cylindrical surface corresponds to the weld seam line, which means to the outer cross section of the part to be welded, for instance, rings, tubes, caps, sockets, or other such various cross sections or various geometrical shapes. The shape of the cross section does not necessarily have to be circular. The axis of the cylindrical surface runs parallel to the axis of the part of the welded, respectively, can be identical therewith.
The disadvantage of welding with such devices however, is the contamination of the pole surfaces by weld splashes, which exert a negative influence on the arc path, result in irregular weld seams and create problems with the coil insulation. The pole faces have therefore to be cleaned constantly, at short intervals. In the case of partially or fully automated welding machines of this kind, an additional device for the removal of weld splashes is therefore required, usually a brushing system.
OBJECT OF THE INVENTION
The invention has the object to avoid these disadvantages and to prevent the contamination of the pole surfaces by weld splashes, so that no more splashes would accumulate in the welding area and disturb the welding process and that the space between the coil and the centering clamp would remain free of splashes.
SUMMARY OF THE INVENTION
The solution of this problem according to the invention consists in the fact that the pole faces are provided with a covering protection ring, having an inner surface surrounding the weld seam line, this surface being inclined towards the weld line. The protective ring is bevelled towards the part to be welded and adjusted to the shape thereof. In the case of parts with circular cross section, (for instance pipes), also in the case of circular weld lines, the inner surface of the ring is a part of a conical surface, wherein the axis of the cone and the axis of the part to be welded coincide. If, during welding, drops fall onto the inner ring surface, they are deflected towards the exterior due to the inclination of this surface according to the invention. Thus, the inclined inner surface of the protection ring serves as a repelling surface for the weld drops. Preferably, copper is used as material for the protection rings. Other materials, such as ceramic and metals can also be used, as far as they do not influence negatively the magnetic field. An efficient cooling is advantageous. Within the teaching of the invention, an inclination of the inner ring surface with respect to the axis of the part to be welded of approximately 50.degree. and more has proven to be particularly advantageous. The angle, respectively the inclination is influenced by the shape of the construction part an
REFERENCES:
patent: 4278868 (1981-07-01), Rudd et al.
patent: 4436980 (1984-03-01), Pache et al.
Dubno Herbert
Kuku Schweissanlagen and Roboter GmbH
Ross Karl F.
Shaw Clifford C.
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