Corner welding connector with cap for plastic hollow profiles, its combination with a plastic hollow profile and method for producing a corner welding connection

Abstract

Corner welding connectors (100) for plastic hollow profiles (200) having at least one hollow chamber (202), in particular into which a reinforcing profile (203) can be inserted or is inserted, comprising a. a base body (10) extending in an insertion direction, which can be inserted into a hollow chamber (201, 202) of the plastic hollow profile (200) at a mitered end of the plastic hollow profile (200), and b. a weld plate (11) arranged on the base body (10) at a miter angle to the insertion direction, which projects at least partially beyond the base body (10), in particular in a direction perpendicular to the insertion direction, and c. a spreading element (14) inside the base body (10) with which the outer cross-section of the base body (10) can be enlarged at least in certain areas, preferably on two opposing side walls (13) of the base body (10), in particular to effect a clamping fastening in the plastic hollow profile (200) by spreading d. the base body (10) can be inserted into the inner free cross-section of a reinforcement profile (203) lying in a hollow chamber (202) and can be fastened in the reinforcement profile (203) by spreading, and characterized in that e. a cap (20) separate from the base body (10) is placed on the base body (10), and f. the base body (10) with cap (20) attached can be inserted into the inner free cross-section of a hollow chamber (201) of a plastic hollow profile (200) and can be indirectly attached to the plastic inner wall of the hollow chamber (201) by spreading via the cap (20).

Description

[0001] The invention relates to a corner welding connector for hollow plastic profiles with the features of the preamble of claim 1. The invention also relates to a combination according to the preamble of claim 6 and a method for producing a corner welding connection of two hollow plastic profiles cut at a miter according to the preamble of claim 10.

[0002] When welding the ends of two hollow plastic profiles cut at a miter at these ends, particularly for the construction of window and door frames or window and door sashes, preferably frame or sash profiles, corner weld connectors of this type are inserted through a mitered end face of the hollow plastic profile into at least one open hollow chamber of the profile to reinforce the corner weld. Such a hollow chamber preferably extends over the entire longitudinal extent through the hollow plastic profile.

[0003] In the welding process used to join the plastic hollow profiles, not only are the narrow profile webs of the two plastic hollow profiles pressed against each other joined, but the significantly larger welding plates of the corner welding connectors clamped in the profiles, which lie in the mitered cut surfaces of the plastic hollow profiles or parallel to it, are also welded together in the area of ​​the mitered cut surfaces of the plastic hollow profiles, so that as a result an angle element consisting of two corner welding connectors is created within the hollow spaces of the joined plastic hollow profiles that merge into each other at the corner, which significantly reinforces the corner connection thus formed and leads to high dimensional stability.

[0004] According to the prior art and also in the invention, for example, the mitered cut surfaces of the plastic hollow profiles with the welding plates of the corner welding connectors are placed against so-called welding mirrors or heating mirrors in order to melt the plastic in the area around the miter cut plane, after which the plastic hollow profiles with the mitered cut surfaces and welding plates are pressed together in the molten, hot state of the plastic, so that the plastic bonds materially, cools down and creates a secure corner connection.

[0005] Corner welding connectors of this type are inserted into the hollow chambers of the plastic hollow profiles before welding, according to the current state of the art, and clamped directly against the plastic inner wall of the hollow chamber by spreading for exact positioning.

[0006] For clamping by expansion, an expansion element is provided inside the base body, both according to the prior art and in the invention. This element, for example, is a clamping body that is wedge-shaped in some areas and is inserted, or at least can be inserted, into the base body of the corner weld connector from the side facing away from the welding plate to be welded. It may be provided, for example, that such a clamping body can be moved axially, i.e., in the insertion direction, by means of a screw supported on the corner weld connector, in particular a screw that can be actuated through the welding plate. This movement can be pulled, in particular, towards the welding plate, thus causing the expansion of the corner weld connector on an outer surface, preferably between two opposing outer surfaces of its base body. This unit is inserted into the hollow plastic profile.

[0007] The corner welding connector known to date in the prior art has, on its base body, an outer cross-section adapted to the inner cross-section of a hollow plastic profile for insertion into such a cavity. This cross-section can be enlarged, at least partially, by the aforementioned spreading action, thus causing a clamping action against the inner wall of the profile's hollow plastic chamber. Such a corner welding connector is known, for example, from DE 9006803 U1.

[0008] Further corner welding connectors are known from documents DE 3924547 A1, DE 9014643 U1 and DE 3712478 C1.

[0009] In the insertion area of ​​the hollow chamber, which is occupied by the corner weld connector in the plastic hollow profile, there is no metallic reinforcement for the assembly method used so far. If metallic reinforcement, e.g., a steel reinforcement in the plastic hollow profile, is provided, the respective reinforcement profile is cut back from the miter cut plane so far that the insertion area is free of reinforcement profile.

[0010] The corner weld connector known from DE 9006803 U1 has a welding plate that projects laterally beyond the base body, particularly in a direction perpendicular to the insertion direction. This forms a stop collar against which the profile chamber webs surrounding a hollow chamber abut when a corner weld connector is inserted. The known corner weld connector then protrudes above the miter cut plane by the thickness of its welding plate or at least by the thickness of the projecting collar. This means that during welding, a significant amount of material from the welding plate of the corner weld connector must first be melted before the mitered plastic hollow profiles and their webs come into contact. A sufficiently large force must be applied when joining the plastic hollow profiles; otherwise, only the corner weld connectors, but not the plastic hollow profiles, would be joined.

[0011] For this reason, the well-known corner welding connector must be designed to be very robust.

[0012] A mounting method in which the weld plate end face lies exactly in the miter cut plane is not possible due to the collar of the corner welding connector of the aforementioned state of the art.

[0013] The present invention relates to a multi-part corner welding connector, preferably for a door leaf, in particular for a door leaf of a plastic door, comprising a leaf frame formed from plastic leaf frame hollow profiles, a substantially circumferential but not connected in the corners of the frame metallic reinforcement profile received in at least one hollow chamber of the leaf frame, which is in particular a steel reinforcement.

[0014] A door leaf of this type, in which the application of the corner welding connector according to the invention is preferred, can be characterized in that at least one, preferably all, of the hollow plastic profile members of the leaf frame comprise a further hollow chamber in which a further metallic reinforcement, e.g., a metal profile, preferably made of steel, is or can at least be received. In such a case, at least two parallel hollow chambers are present in the respective hollow plastic profiles, in which two reinforcing profiles are or can at least be arranged parallel to each other.

[0015] This reinforcement is preferably incorporated at least in the profile rails of the sash frame and, depending on the application area, such as hinge mounting, locking mounting or door closing mounting, the reinforcements can be incorporated in all four plastic hollow profile rails of the sash frame of such a door sash, each in duplicate, or only one reinforcement profile can be provided in each plastic hollow profile rail.

[0016] The corner welding connectors described in the aforementioned document are unsuitable for such hollow plastic profiles with two adjacent hollow chambers, as their use requires the plastic to be pressed between two welding plates until the webs of the hollow plastic profiles meet. Furthermore, sufficient frame strength could not be achieved with such corner welding connectors, since the steel profiles – as mentioned earlier – would not extend into the corners.

[0017] Since the expansion of a corner weld connector can only eliminate small gaps between the outer surface(s) of the base body and the plastic inner wall of a steel-free hollow chamber for the purpose of clamping, the outer cross-section of the base body of existing corner weld connectors is only slightly smaller than the free inner cross-section of the hollow chamber in the plastic hollow profile, i.e., by the amount of the gap that can be eliminated. Such a known corner weld connector therefore cannot be inserted into the free inner cross-section of a reinforcing profile. As mentioned, a reinforcing profile may not extend into the corner area, but must be cut back at each corner by at least the insertion depth of the corner weld connector.

[0018] The object of the invention is therefore to provide a universally applicable corner welding connector that is easy and quick to assemble. Such a connector should allow hollow plastic profiles with one or more hollow chambers that can be filled with reinforcing profiles to be joined, regardless of whether a reinforcing profile is present in a particular hollow chamber or not. Furthermore, the corner welding connector should enable a reinforcing profile to project further into the corner area than is currently possible with the prior art. Preferably, the corner welding connector should also allow for the connection of hollow plastic profiles within the reinforcing profile itself.

[0019] This problem is solved by a corner weld connector of the generic type mentioned above, which furthermore has the features of the characterizing part of claim 1. The problem is also solved by a combination with the characterizing features of claim 6 and a method with the characterizing features of claim 10.

[0020] The corner welding connector according to the invention has the advantage that it can be used both in hollow chambers of sash frame profiles which are designed without a metallic reinforcing profile in the corner area or over the entire length of the hollow chamber, and in hollow chambers with metallic reinforcing profiles extending into the corner area, in particular wherein a hollow chamber is filled with a preferably hollow metallic reinforcing profile cut at a miter like the sash frame profile.

[0021] The invention provides that, contrary to the invention, only the base body of the corner welding connector according to the invention can be inserted into the metallic reinforcement profile and fastened by spreading, whereas the corner welding connector as a whole, i.e., the base body with attached cap, can be inserted into a hollow chamber that is at least free of reinforcement in the corner area and fastened by spreading.

[0022] To achieve this, the outer cross-section of the base body is preferably adapted to the inner cross-section of the reinforcing profile in such a way that the gap enabling insertion can be eliminated, at least partially, by spreading. Furthermore, the outer cross-section of the base body with the attached cap is adapted to the inner cross-section of the hollow chamber in such a way that, in this combined arrangement, the gap enabling insertion can be eliminated, at least partially, by spreading.

[0023] It can be provided that the base body alone, or the base body with the cap attached, expands in only one direction, e.g., the direction of the spacing between two opposing outer wall surfaces of the base body, preferably those being the largest surfaces of the base body. This direction can preferably be the thickness direction of the base body, perpendicular to the insertion direction. These largest surfaces of the base body are preferably formed on the side walls of the base body, in particular those to which the force applied by the expanding element is transferred directly to the inner walls of the hollow chamber or indirectly, via the cap, to the inner walls of the reinforcing profile. The expanding element is preferably arranged inside the base body between its side walls and is designed to move the side walls outwards, at least partially, during expansion.

[0024] The use of an additional metallic reinforcing profile has proven particularly stabilizing for plastic door leaves. In this preferred embodiment of the leaf frame profiles, these profiles have two or more hollow chambers, preferably of the same dimensions, and more preferably arranged directly adjacent and parallel within the plastic hollow profile. For this purpose, adjacent hollow chambers may share a common web separating them.

[0025] The corner welding connector according to the invention can also be used with these wing frame profiles with two or even more parallel metallic reinforcement profiles, even if the respective reinforcement extends into the corner area, in particular which would have to remain free of reinforcement when using a known corner welding connector.

[0026] In the corner areas, corner welding connectors according to the invention can thus be inserted into the hollow chamber, which is provided with or without a reinforcing profile.

[0027] The corner welding connectors according to the invention are provided with a welding plate made of plastic, in particular the same as the plastic hollow profiles, for producing a corner connection of the frame of, for example, a previously mentioned door, which is arranged in the same miter angle in the insertion direction as the sash frame profiles are cut or are cut and is welded together with the plastic hollow profiles forming the corner in the miter areas, in particular in the manner mentioned at the outset.

[0028] Reinforcing profiles can be incorporated around the entire perimeter of a frame – i.e., in all frame members – or only in individual members, each in one or more (both) hollow chambers of the frame members. The corner welding connector according to the invention can be used for all these designs of sash frame profiles, namely, according to the invention, either with the cap placed on the base body or, not according to the invention, only with the base body alone, i.e., without the cap.

[0029] In the case of door leaves, a wing frame profile preferably has two inner hollow chambers, wherein, for stability reasons, a reinforcing profile is arranged in at least one of the two hollow chambers and in the same hollow chamber for each profile in the formed door leaf, preferably forming a circumferential reinforcement in the manufactured door.

[0030] The second hollow chamber offers the possibility of accommodating a second metallic reinforcement. This is either arranged around the entire circumference or only in some of the wing's hollow profiles.

[0031] Thus, various combinations of reinforced plastic hollow profiles are possible. For example, both hollow chambers of adjacent plastic hollow profiles across a corner are provided with reinforcing profiles, particularly extending from corner to corner. Alternatively, in one or both adjacent profiles, only one hollow chamber can have a steel reinforcement extending into the corner area. Preferably, the steel profiles in the corresponding hollow chambers at the corners are also arranged opposite each other with their mitered cuts, and preferably, after welding, even in contact with each other.

[0032] The corner welding connectors according to the invention are designed to be so universal that they are compatible with any profile situation and can be used quickly.

[0033] A significant advantage of the invention is that the corner welding connector according to the invention is composed of a base body and a cap placed on it, preferably in a form-fitting manner, preferably so that the cap, with at least one edge parallel to the miter cut plane and to the welding plate, rests flush against a stop edge of the base body or the welding plate, in particular against an edge of the welding plate of the base body.

[0034] The stop edge is preferably formed by the overhang with which the weld plate projects beyond the outer surfaces of two opposing outer walls of the base body in at least one direction, particularly in a direction perpendicular to the insertion direction. This direction can be the direction of the spacing between the outer walls, the spacing of which can be increased, at least in some areas, by spreading.

[0035] Preferably, the collar overhang is selected such that the outer cross-section of the weld plate forming the overhang is larger in at least one direction, particularly the one mentioned above, than the inner cross-section of the reinforcing profile (especially when considered in the same direction) which is intended to support the base body. This ensures that the collar, without an attached cap, also simultaneously forms a stop for the reinforcing profile, which is preferably mitered.

[0036] This ensures that the base body, without the cap, can only be inserted into the reinforcement profile until it reaches the stop. Preferably, the reinforcement profile is positioned at a point where the overhang forming the stop edge is located away from the mitered cut plane of the hollow plastic profile by the thickness of the weld plate (viewed in the insertion direction). This ensures that, after insertion and engagement with the reinforcement profile, the corner weld connector lies with the outwardly facing surface of the weld plate in the mitered plane.

[0037] In this combination, compared to the prior art, no plastic material from the welding plate lying above the miter cut plane needs to be pressed away before the webs of the hollow plastic profiles to be welded make contact. In the invention, the welding plate and the webs of the hollow plastic profiles come into contact simultaneously during welding.

[0038] In one possible design of the corner joint, it may be provided that during welding, so much material of the plastic hollow profiles and the welding plates is compressed, especially in the thickness of the welding plate overhang considered in the insertion direction, that after welding the mitered reinforcing profiles touch.

[0039] The invention may further preferably provide that the outer cross-section of the welding plate, viewed in the insertion direction, is smaller than the inner cross-section of a hollow chamber of the plastic hollow profile, viewed in the same direction, which is intended to accommodate the base body with cap. This ensures that, in the case of a hollow chamber without a metallic reinforcing profile located in the corner, the base body with the welding plate attached to it can be fully inserted into the hollow chamber without striking the hollow chamber walls. Thus, in contrast to the prior art, the welding plate can be positioned precisely in the plane of the miter cut.

[0040] The invention provides that the welding plate only protrudes beyond the base body at the edges inclined at a miter angle to the insertion direction, but not at the other edges. This ensures that the welding plate remains parallel to the miter cut plane when fully inserted into the hollow chamber.

[0041] This means, for example, that only the base body, i.e. without the cap, can be used for the hollow chambers of a plastic hollow profile with reinforcement extending to the corner area, and in a hollow chamber of a plastic hollow profile without reinforcement in the corner area, the base body can be fitted with the cap placed on it.

[0042] The reinforcing steel is, for example, a four-fold folded steel and can be offered in different wall thicknesses. The cap functions as a gap filler and is intended to cover the gap between the base body and the surrounding plastic inner wall of the hollow chamber in the plastic hollow profile, in particular to fill the gap at least as much as possible, especially to the extent that it can be eliminated by spreading.

[0043] The cap is preferably a single piece, U-shaped, and placed on the base body according to the invention. Preferably, it is connected to the base body by a force-fit and / or friction-fit connection, at least after the base body has been expanded, and is releasable. The sidewall thickness of the cap need not be identical to the wall thickness of the reinforcing steel. The cap does not have to replace the steel reinforcement one-to-one. In particular, the sidewall thickness can be less than the wall thickness of the steel reinforcing profile of the respective wall with which the cap interacts by expanding the base body.

[0044] The cap can be formed by a U-shaped profile extending longitudinally in the insertion direction of the base body, with one of the ends, which points towards the welding plate in the installed state, running at a miter angle to the insertion direction.

[0045] An advantageous embodiment of the invention lies in the fact that the cap is formed from three side walls, and is therefore open on one side in the circumferential direction. Two of these side walls are opposite each other and are connected by a side wall that forms a connecting wall. The connecting wall can be faceted, as can the wall area of ​​the base body that connects its side walls and is covered by the connecting wall of the cap. In particular, the connecting wall forms a solid hinge for the two opposing side walls, such that their distance can be easily changed by spreading the base body.

[0046] The metallic reinforcement can preferably have a profile with walls on four sides.

[0047] A replacement accessory in the form of a four-sided sleeve would necessarily have to have the same wall thickness as the reinforcing steel, otherwise the space between the corner weld connector body and the hollow chamber could not be filled precisely.

[0048] The cap is therefore preferably characterized by walls on three sides, whereby the side walls need not have the same thickness as the steel wall, but may. The thickness of the cap's side walls may differ from, and in particular be less than, the thickness of the reinforcement wall. The thickness of the cap's side walls may be thinner or thicker than the thickness of the reinforcement profile.

[0049] The integrated spreading element inside the base body can be designed according to the state of the art, e.g. by means of a wedge mechanism which is moved by an adjusting screw and completely compensates for the gap between the outer surface of the base body and the metal inner wall of the reinforcement profile or between the outer surface of the base body and the inner surface of the cap as well as between the outer surface of the cap and the inner surface of the plastic inner wall of a hollow chamber.

[0050] Compensating for the gap, or eliminating the remaining gap after insertion which serves to clamp the base body without the cap, is not suitable for compensating for larger distances resulting from the absence of metallic reinforcements. For this reason, and also for a stable solution, the cap forms a supplementary component and filler according to the invention, which is particularly important in the case of a front door.

[0051] The installer is provided with a universally installable accessory in the form of a cap, which is preferably compatible with several different steel wall thicknesses. Further individual adjustments are made possible by the integrated expansion element of the base body. The interaction of these two components ensures a precise fit for the corner weld connector.

[0052] The invention is explained in more detail below with reference to the drawings. The figures show, in detail: Fig. 1a Shows a basic body in perspective view Fig. 1b Shows a cap for a primitive body in perspective view Fig. 2a Shows a basic body in front view Fig. 2b Shows a cap for a basic body in front view Fig. 3a Shows a vertical and a horizontal wing frame hollow profile, each with two hollow chambers, one of which is filled with a reinforcing profile, in perspective view, without inserted corner weld connectors. Fig. 3b Shows the execution according to Fig. 3a with corner weld connector consisting of base body and cap in insertion and base body without cap in insertion according to the invention Fig. 3c Shows a vertical and a horizontal wing frame hollow profile with two hollow chambers each in side view with base body in insertion. Fig. 4a Shows a horizontally extending wing frame hollow profile with two hollow chambers each in perspective view with inserted base body with cap and base body inserted without cap (not according to the invention). Fig. 4b Shows a horizontally extending wing frame hollow profile with two hollow chambers each in a rear section with inserted base body with and not without cap according to the invention.

[0053] In Fig. Figure 1a shows a basic body 10 of a corner welding connector according to the invention in a perspective view. It is shown here in a simplified schematic form and can comprise a U-shaped profile. A welding plate 11 is formed on one end face, the surface of which, after insertion, lies in the miter plane A with its surface facing outwards and is inclined relative to a longitudinal axis corresponding to the insertion direction, according to the intended miter angle, in particular 45 degrees. The welding plate 11 projects at least beyond the two opposing side walls 13, optionally also beyond the upper side wall, but preferably not beyond the lower one, so that a stop edge 12 is formed by the projection at the transition from each of the two side walls 13 to the welding plate 11.

[0054] Fig. Figure 2a shows the base body 10 in a rear view of its interior. The base body 10 is made of, for example, plastic and contains an internal spreading element 14, which is indicated schematically in the drawing.

[0055] Fig. Figure 1b shows a cap 20 for a base body 10 in a perspective view. The cap 20 is a single piece and U-shaped, and the shape of its inner wall is preferably complementary to the surface of the base body 10, so that the cap 20 can be detachably, preferably by positive and / or force-fit connection, to the base body 10, in particular by placing / sliding the cap onto the surface of the base body.

[0056] The cap 20 has a stop edge 22' at the end facing the welding area or miter cut of the wing profile 200. This stop edge lies parallel to the miter cut plane A and preferably runs at a miter angle of, for example, 45 degrees to the longitudinal direction. When fitted, the cap 20 rests with its end face 22' flush against the stop edge 12 of the welding plate on the base body 10.

[0057] Fig. Figure 2b shows a cap 20 for a base body 10 in a front view. The cap 20 is open at the bottom and can be open or closed on the side opposite the miter cut. The cap 20 is made of dimensionally stable material, for example PVC or folded steel.

[0058] Fig. Figure 3a shows a vertical and a horizontal wing frame hollow profile 200 with two hollow chambers 201, 202 each in perspective view, without inserted corner weld connectors 10, 100. The reinforcement, e.g. steel reinforcement 203), is recessed inwards into the profile by the thickness of the weld plate 11 or more from the miter cut plane A.

[0059] The stop edge 12 of the base body 10 serves as a stop for the reinforcement 203 when inserted into a hollow chamber with reinforcement 202, as shown in Fig. 3b is clearly illustrated.

[0060] The base body 10 with the cap 20 attached according to the invention forms the corner weld connector 100 and can be inserted into the open ends of a hollow chamber without reinforcement 201. The cap 20 performs a filling function and fills the gap between the base body 10 and the inner wall of the hollow chamber on three sides, which is created by the missing reinforcement 203.

[0061] In this application variant, the stop edge 12 of the base body 10 serves as a stop for the previously attached cap 20 and enables the correct positioning of the cap 20 to the base body.

[0062] Fig. Figure 3c shows a vertical and a horizontal sash frame hollow profile 200, each with two hollow chambers 201, 202, in side view with the base body 10 inserted. This figure illustrates a preferred embodiment in which the base body 10 is inserted centrally and horizontally into the horizontal sash frame profile shown below.

[0063] In the corner areas, corner welding connectors 100, or, according to the invention, only their base bodies 10, can preferably be inserted into the hollow chambers 201, 202 and / or into the reinforcing profile 203. These corner welding connectors or base bodies and / or caps can preferably be manufactured from mitered profiles for the production of the door sash frame and welded together with the sash frame hollow profiles 200 in the mitered areas.

[0064] Fig. Figure 4a shows a vertically and a horizontally extending wing frame hollow profile 200 with two hollow chambers 201, 202 each in a perspective view with an inserted corner weld connector 100 consisting of a base body and cap 20 and a base body 10 without cap 20 inserted according to the invention. Both corner weld connector variants 10, 100 are arranged in immediately adjacent hollow chambers 201, 202 and together form a large welded area 11', which is separated only by the narrow web 206', but ultimately, like all webs, is part of the entire welded area.

[0065] The two-part corner weld connector 100 fills the missing reinforcement in the corner area, acting as a filler element. The cap 20 replaces the wall of the reinforcement 203 in the hollow chamber 201 on at least three sides. The small remaining dimensional adjustment between the corner weld connector and the inner hollow chamber wall is achieved via the expanding element 14.

[0066] Additional fastening elements 205, e.g. screws, can be used to finally fix the corner welding connector 100 in the sash frame hollow profile 200 after prior clamping.

[0067] Fig. Figure 4b shows a horizontally extending hollow sash frame profile 200 with two hollow chambers 201 and 202 each, in a section with an inserted corner weld connector 100 consisting of a base body and cap, and with the base body inserted, but on the side facing away from the miter cut plane. In this view, the expanding elements 14 and the fastening elements 205, which hold the corner weld connector (100) in a fixed position, can be seen schematically. Reference symbol list 100 corner welding connectors (two-piece) 10 basic shapes 11 Welding plate 11' both welding plates 12 Stop edge 13 Side wall 14 Spreading element 15 weld plate thickness 20 caps 21 Stop edge 22 side wall 22' sidewall thickness 23 Back 200 plastic hollow profile / sash frame hollow profile A miter cut plane 201 Hollow chamber without reinforcement profile 202 Hollow chamber with reinforcing profile 203 Reinforcement profile 203' Reinforcement profile wall thickness 204 Profile welding area 205 Fastening element 206 weld bridges 206' Narrow welded bridge

Claims

[1] Corner welding connectors (100) for plastic hollow profiles (200) having at least one hollow chamber (202), in particular into which a reinforcing profile (203) can be inserted or is inserted, comprising a. a base body (10) extending in an insertion direction, which can be inserted into a hollow chamber (201, 202) of the plastic hollow profile (200) at a mitered end of the plastic hollow profile (200), and b. a weld plate (11) arranged on the base body (10) at a miter angle to the insertion direction, which projects at least partially beyond the base body (10), in particular in a direction perpendicular to the insertion direction, and c. a spreading element (14) inside the base body (10) with which the outer cross-section of the base body (10) can be enlarged at least in certain areas, preferably on two opposing side walls (13) of the base body (10), in particular to effect a clamping fastening in the plastic hollow profile (200) by spreading d. the base body (10) can be inserted into the inner free cross-section of a reinforcement profile (203) lying in a hollow chamber (202) and can be fastened in the reinforcement profile (203) by spreading, and characterized by , that e. a cap (20) separate from the base body (10) is placed on the base body (10), and f. the base body (10) with cap (20) attached can be inserted into the inner free cross-section of a hollow chamber (201) of a plastic hollow profile (200) and can be indirectly attached to the plastic inner wall of the hollow chamber (201) by spreading via the cap (20). [2] Corner welding connector (100) according to claim 1, characterized by , that the cap (20) can be placed flush against a stop edge (12) of the welding plate (11) with at least one edge (21) parallel to the welding plate (11), in particular a stop edge (12) formed by the overhang of the welding plate (11) over the base body (10). [3] Corner welding connector (100) according to any one of the preceding claims, characterized by , that the welding plate (11) only protrudes beyond the base body (10) at its edges which are inclined at a miter angle to the insertion direction. [4] Corner welding connectors (100) according to any one of the preceding claims, characterized by that the cap (20) covers the base body (10) at least partially, preferably completely, on three sides. [5] Corner welding connector (100) according to claim 4, characterized by, that the cap (20) is one-piece and U-shaped, in particular comprising two opposing side walls (22) connected by a connecting wall, preferably the distance between which can be changed at least in part by spreading the base body (10) towards each other. [6] Combination of at least one plastic hollow profile (200) with at least one metallic reinforcing profile (203) in at least one of its hollow chambers (201, 202), at least one corner weld connector (100) with at least one cap (20) placed on the base body (10) of the corner weld connector (100) according to one of the preceding claims, characterized by, that the outer cross-section of the base body (10) of the corner weld connector (100) is adapted to the inner cross-section of a reinforcing profile (203) such that the base body (10) can be inserted into the reinforcing profile (203) forming a gap between at least one inner wall of the reinforcing profile (203) and at least one outer wall of the base body (20), which can be eliminated at least partially by spreading the base body (10), and that the outer cross-section of the base body (10) with the attached cap (20) is adapted to the inner cross-section of a hollow chamber (201) such that the base body (10) together with the cap (20) can be inserted into the hollow chamber (201) forming a gap between at least one inner wall of the hollow chamber (201) and at least one outer wall (22) of the cap (20), which can be eliminated by spreading the base body (10) and thereby The indirectly caused spreading of the cap (20) can be eliminated at least in some areas. [7] Combination according to claim 6, characterized by , that the outer cross-section of the weld plate (11), in particular considered in the direction of the spacing of two side walls (13) of the base body (10) that cause the clamping, is larger than the inner cross-section of the reinforcing profile (203) which is intended to accommodate the base body (10). [8] Combination according to claim 6 or 7, characterized by , that the reinforcement profile (203) in a corner to be formed is at least or exactly by the thickness of the welding plate (11) considered in the insertion direction at the location of the overhang forming the stop edge (12) from the miter cut plane (A) of the plastic hollow profile (200). [9] Combination according to any one of the preceding claims 6 to 8, characterized by, that the outer cross-section of the weld plate (11) is smaller when viewed in the insertion direction than the inner cross-section of a hollow chamber (201) of the plastic hollow profile (200), in particular which is intended to accommodate the base body (10) with cap (20). [10] Method for producing a corner weld joint of two plastic hollow profiles (200) cut at a miter, in which at least one corner weld connector (100) according to one of the preceding claims is inserted into each of the two plastic hollow profiles (200), characterized by , that a. if a hollow chamber (201) is present which does not have a metallic reinforcing profile (203) in the corner area, the corner welding connector (100) with cap (20) placed on its base body (10) is inserted into the hollow chamber (201) and clamped by spreading it against the inner walls of the hollow chamber (201), and b. the plastic hollow profiles (200) are joined by welding to the welding plates (11) located in or in the vicinity of the plane of the miter cut. [11] Method according to claim 10, characterized by , that during welding so much material of the plastic hollow profiles (200) and the welding plates (11) is compressed, in particular an amount of material corresponding to the thickness of the welding plate overhang considered in the insertion direction, that after welding the mitered reinforcement profiles (203) touch.

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