Abstract: A roller electrode assembly (1) for applying a high-frequency alternating electric field to a workpiece (5a, 5b) has a core (2) which is at least partially made of electrically conductive material and surrounded by a tire (3) which can be filled with a protective gas and is made of a dielectric material.

Abstract: An optical head for a laser transmission welding apparatus comprising a housing with an end on the outlet side with respect to a laser beam and a ball mounted in the housing. The ball may comprise a material whose refractive index is higher than the refractive index of quartz glass.

Abstract: A roller electrode assembly (1) for applying a high-frequency alternating electric field to a workpiece (5a, 5b) has a core (2) which is at least partially made of electrically conductive material and surrounded by a tire (3) which can be filled with a protective gas and is made of a dielectric material.

Abstract: A method for the quasi-simultaneous welding of at least two types of welding by means of a laser beam, wherein the laser beam originates from a laser optic which is associated with a platform of a delta robot and is guided by a movement of this platform.

Abstract: A water vapor permeable, waterproof textile laminate, comprising at least two layers made of planar web material, which are disposed on top of each other and bonded to each other, wherein an open fabric web comprising polymer fiber threads forms a top tier and a film-like, water vapor permeable, waterproof thermoplastic membrane web forms a bottom tier. The polymer fiber threads of the fabric web comprise raised thread regions, which are held bearing against the membrane web and/or are partially fused into the membrane web, wherein the membrane web comprises integral fusion areas with the raised thread regions, which are generated according to the invention by way of laser light in a laser transmission welding method.

Abstract: The invention relates to a process for the adjustment of a laser light spot of high intensity for the laser processing of work pieces as well as a laser device for performing the proposed process. The laser device comprises a laser emitting a laser beam and at least one focusing lens for converging the laser beam as well as an optical operating element for adjusting the beam diameter of the laser beam. The invention proposes to use as operating element a diffractive optical element that separates the laser beam emitted by the laser into partial laser beams, with the partial laser beams generated by the diffractive optical element being assembled to form a resulting laser beam that acts on the work piece. By means of a suitable design of the diffractive optical element it is possible to adjust, in particular enlarge, the diameter of the laser light spot as required.

Abstract: A water vapor permeable, waterproof textile laminate, comprising at least two layers made of planar web material, which are disposed on top of each other and bonded to each other, wherein an open fabric web comprising polymer fiber threads forms a top tier and a film-like, water vapor permeable, waterproof thermoplastic membrane web forms a bottom tier. The polymer fiber threads of the fabric web comprise raised thread regions, which are held bearing against the membrane web and/or are partially fused into the membrane web, wherein the membrane web comprises integral fusion areas with the raised thread regions, which are generated according to the invention by way of laser light in a laser transmission welding method.

Abstract: A device and a process for processing and/or joining work pieces via laser radiation, with an effective power laser and a pilot target laser that emit laser beams of different wavelengths, with the laser beams being directed at the work pieces by laser optics. Regarding the laser beams, by the laser optics that comprise at least one diffractive optical element (DOE) as a masking system, the beam pattern of the pilot target laser is adjusted to match the beam pattern of the effective laser beam. This is accomplished preferably by removing the pilot laser beam from the effective laser beam for part of the path length by dichroic mirrors, and by expanding the diverging pilot laser beam on said part of the path length by deflecting mirrors whose distance from the dichroic mirrors is variable.

Abstract: The invention relates to a laser head (11) for connecting tubular parts (1, 3, 12, 13) by the laser transmission method and to a method of connecting the tubular parts (1, 3, 12, 13) by means of the laser head (11). The laser head (11) and the method that can be performed by the laser head (11) are suitable in particular for connecting a connecting element or branching element (1) to one end of a plastic pipe (3). The laser head (11) makes simultaneous welding possible and has at least two shell parts (16) that can be radially separated from each other so that the laser head (11) can be placed around a connecting section (4) or a connecting region (15) of the tubular parts (1, 3, 12, 13). A number of laser sources (17) are arranged in the shell parts (16) in such a way that the laser beams (7) emerging from the laser sources (17) overlap at the connecting section (4) or at the connecting region (15) of the parts (1, 3, 12, 13).

Abstract: The invention relates to an electric hot wedge (1) for a welding device for the seam-like connecting of plastic webs, having a welding wedge (2) and a welding wedge attachment (3) made of metal, wherein the welding wedge (2) comprises at least one electric heating resistor (13) having a heating conductor (16), which is bonded to a ceramic carrier (15) as a conductive layer (12) and is preferably protected by a ceramic cover layer. According to the invention, the welding wedge attachment (2) has a support structure (28) made of metal on the side thereof, which substantially extends across the entire length and/or width of the electric heating resistor (16) and which mechanically stabilizes the carrier (15) of the heating resistor (16).

Abstract: An induction connecting sleeve for connecting weldable thermoplastic elements by means of fusion, with at least two sockets for the insertion of connection sections of the thermoplastic elements to be connected, and with an induction heating element embedded in the sockets, with operative sections of the induction heating element surrounded completely by a weldable thermoplastic material, and with the induction heating element arranged coaxially to the sockets. The induction heating element may be manufactured of metallic material with spring characteristics and to embed it under pre-tension in the thermoplastic material of the sockets. When the induction heating element is heated and the thermoplastic material of the socket of the induction connecting sleeve is plasticized, the induction heating element relaxes which causes radial pressure to build towards the connection section.

Abstract: The invention relates to a method for determining the temperature-dependent state, in particular the melt state and/or the melt quantity of thermoplastic material when producing a weld seam (6), for example for joining thermoplastic parts (7, 7?) by means of a plastic welding device. For process control purposes, a temperature-dependent electric state variable of the thermoplastic material of the plastic parts (7, 7?) is measured continuously with and without applying heat to the plastic parts (7, 7?) along the weld seam (6) and compared to a target value or to benchmark values. In the method according to the invention, the electric state variable that is used is preferably the permittivity of the plastic parts (7, 7?). The permittivity is determined by means of the capacitor assembly (1) wherein the plastic material is used as the dielectric between the electrodes (3, 4) of the capacitor assembly (1).

Abstract: The invention relates to a process for the adjustment of a laser light spot of high intensity for the laser processing of work pieces as well as a laser device for performing the proposed process. The laser device comprises a laser emitting a laser beam and at least one focusing lens for converging the laser beam as well as an optical operating element for adjusting the beam diameter of the laser beam. The invention proposes to use as operating element a diffractive optical element that separates the laser beam emitted by the laser into partial laser beams, with the partial laser beams generated by the diffractive optical element being assembled to form a resulting laser beam that acts on the work piece. By means of a suitable design of the diffractive optical element it is possible to adjust, in particular enlarge, the diameter of the laser light spot as required.

Abstract: Electrical heating element 1, preferably for the ignition of biomass heating systems such as pellet stoves, with an elongated coil carrier 2 that is made of a thermally resistant, electrically insulating material and is designed to accept a heating wire coil, where the heating wire coil is held spiral-like on the outside the coil carrier 2 and is enclosed by a sleeve tube 4 also made of a thermally resistant material. The coil carrier 2 and the sleeve tube 4 delimit an air channel 5 through which the heating wire coil passes. According to the invention, the coil carrier 2 comprises at least two adjacent coil carrier shell parts 6, 6? that extend symmetrically to the center axis 8 of the heating element 1 in the longitudinal direction of the coil carrier 2.

Abstract: The invention relates to a method for connecting material webs disposed with overlapping edges, wherein an automatic welding machine having a driven chassis and a drive unit disposed thereon and a welding unit is guided along the overlap zone of the material webs to be connected, such that the carried welding unit connects the edges to be connected to one another. The invention further relates to an automatic welding machine for performing the method.

Abstract: The invention relates to a laser head (11) for connecting tubular parts (1, 3, 12, 13) by the laser transmission method and to a method of connecting the tubular parts (1, 3, 12, 13) by means of the laser head (11). The laser head (11) and the method that can be performed by the laser head (11) are suitable in particular for connecting a connecting element or branching element (1) to one end of a plastic pipe (3). The laser head (11) makes simultaneous welding possible and has at least two shell parts (16) that can be radially separated from each other so that the laser head (11) can be placed around a connecting section (4) or a connecting region (15) of the tubular parts (1, 3, 12, 13). A number of laser sources (17) are arranged in the shell parts (16) in such a way that the laser beams (7) emerging from the laser sources (17) overlap at the connecting section (4) or at the connecting region (15) of the parts (1, 3, 12, 13).

Abstract: The invention relates to an electric hot wedge (1) for a welding device for the seam-like connecting of plastic webs, having a welding wedge (2) and a welding wedge attachment (3) made of metal, wherein the welding wedge (2) comprises at least one electric heating resistor (13) having a heating conductor (16), which is bonded to a ceramic carrier (15) as a conductive layer (12) and is preferably protected by a ceramic cover layer. According to the invention, the welding wedge attachment (2) has a support structure (28) made of metal on the side thereof, which substantially extends across the entire length and/or width of the electric heating resistor (16) and which mechanically stabilizes the carrier (15) of the heating resistor (16).

Abstract: The invention relates to a method for connecting material webs disposed with overlapping edges, wherein an automatic welding machine having a driven chassis and a drive unit disposed thereon and a welding unit is guided along the overlap zone of the material webs to be connected, such that the carried welding unit connects the edges to be connected to one another. The invention further relates to an automatic welding machine for performing the method.

Abstract: An induction connecting sleeve for connecting weldable thermoplastic elements by means of fusion, with at least two sockets for the insertion of connection sections of the thermoplastic elements to be connected, and with an induction heating element embedded in the sockets, with operative sections of the induction heating element surrounded completely by a weldable thermoplastic material, and with the induction heating element arranged coaxially to the sockets. The induction heating element may be manufactured of metallic material with spring characteristics and to embed it under pre-tension in the thermoplastic material of the sockets. When the induction heating element is heated and the thermoplastic material of the socket of the induction connecting sleeve is plasticized, the induction heating element relaxes which causes radial pressure to build towards the connection section.

Abstract: An electrical resistance heating element for a heating device, with at least one flow canal through which the gaseous medium is able to flow from a canal inlet side to a canal outlet side of the resistance heating element, and with at least one heating resistor that extends essentially in the direction of the flow canal, with the medium flowing past the heating resistor and being heated in the process. The heating resistor is rod-shaped and produced from an electrically conductive ceramic material. The electrical resistance heating element is intended for installation in a heating tube into which air, for example, is blown at one end. The heated flow of air exits from the other end of the heating tube.