DE3022197A1 - Welded mitred joint for light alloy profiles - uses intermediate plate with locating bosses firmly connected to both profiles - Google Patents

Abstract

The mitred joint between two pieces of hollow light alloy profiles (1,2) of complicated cross-section can be made without the need for close tolerance observation. For this purpose an intermediate plate (3) of weldable light alloy is used for joining. The plate has a number of bosses, stamped out of its surface, which are aligned with the inner surfaces of the profiles along a section inclined at 45 deg. The lengths of the profiles, which are to be joined, are fitted over the bosses on opposite sides of the plate. Each profile is then welded to the plate by the light arc process without the use of a filler rod. This method of welding requires little or no finish machining.

Description

Joining of profiles

The present invention relates to a joining technology, in particular Soldering or welding connection of profiles abutting one another in one plane and is particularly suitable for thin-walled hollow profiles, such as those used for door and window frames be used. These profiles often have a complicated cross-sectional shape and are produced in great lengths by an extrusion process. With miter Adjoining profiles were previously screwed, often with complicated shapes and therefore expensive connectors were necessary. If you put these profiles together wants to weld or solder, thin-walled profiles in particular must be careful and aligned with each other with small tolerances, so between them there is no impermissibly large gap that is created with the usual technical joining connections cannot be bridged. There are also numerous materials that can be used for the Production of profiles are very suitable, but they are not at all technically joined or can only be connected with considerable effort.

In the VDI-Nachrichten of 09/30/77 it is described how windows, Doors and garage doors made of aluminum using a negative profile with a Epoxy resin to be glued. The production of these negative profiles is special associated with considerable effort in corner connections.

The object of the present invention is a technical joining connection of profiles abutting one another in one plane, in particular with a miter, which are fast and can be produced economically in large series and avoids the problems mentioned above.

The intermediate plate proposed in the first claim offers both Profiles a defined, flat and smooth contact surface on which a roughly sawn-off Profile can be moved into the desired position during assembly.

Between the profile and the intermediate sheet is on the full circumference a surface is available that can be better connected in terms of joining technology than butt butted one Profiles. Unavoidable tolerances in the profile cross-section or miter angle or those that could only arise as a result of the heating during welding or soldering, easily lead to a shift in the case of directly abutting profiles, so that the profiles can no longer be connected properly, while between Profile and the intermediate sheet the surface remains geometrically unchanged.

In the second claim, a combination of materials is proposed, which is of particular interest to the present invention. A profile material Extruded material can be made without additional material due to its susceptibility to cracking do not weld. A weld with the addition of a filler material in The shape of a welding wire would be a significant factor in the case of complicated profile shapes Cause effort. The intermediate sheet serves here as a filler material.

In the third claim, 2 suitable materials are proposed.

In the fourth claim there is a special application of the present Invention shown. Residential and industrial buildings have long been complicated Shaped light metal profiles for door and window frames butted together with a miter and screwed. Be there considerable demands on the later Dimensional accuracy of the finished frame made because this later with already cut Glass panes are to be filled. In automotive engineering, light metal window frames have significant advantages in terms of weight savings and corrosion resistance. So far, however, they have not been able to be made from the inexpensive extruded profiles will.

The fifth claim is a known per se, but for the present Invention particularly useful welding method proposed. About the heat input in the thin-walled profiles, this welding process should also be used be carried out in a manner known per se in a pulsating manner.

The sixth claim is a known per se, but for the present one Invention particularly useful soldering method proposed. This creates a Connection that did not stand over the sheet within the manufacturing tolerances having in the cutting plane.

Figures 1 to 3 show possible embodiments of the invention.

Figure 1 shows a plan view of a connection of two mitred abutting Profiles Figure 2 shows the outline of the intermediate plate from Figure 1.

FIG. 3 shows a cross section through the one shown in FIG Profiles, at right angles to the longitudinal axis of the profile.

In Figure 1, the profiles 1 and 2 are each at 450 to their longitudinal axis cut off and pressed against an intermediate plate 3, the outline of which on the entire Circumference around 1.5 mm larger than the outline of the profiles in the Miter plane. With a profile cross-section of 40 mm and a profile wall thickness from 1.5 - 5 mm, the mentioned 1.5 mm are sufficient to compensate for all tolerances and become nearly in the usual tungsten inert gas alternating current welding process melted down to the profile cross-section, so that after welding no or only a little post-processing of the weld seam is required.

Claims (6)

Joining connection of profiles Claims 1. Joining technology Connection of profiles that abut on one level with the following M e r k m a 1 e n a) Between two contiguous profiles is in the cutting plane a sheet is arranged, b) this sheet is technically fAgetechnisch with the two profiles tied together. 2. Joining connection according to claim 1 with the following M e r k m a 1 e n: a) The profiles to be connected consist of a light metal, in particular an extruded material, b) the intermediate sheet consists of an easily weldable one Light metal. 3. A compound according to claim 2 with the following M e r k -malen: a) The Profiles consist of AlMgSi 0.7 or a similar material, b) the intermediate sheet consists of AlSi 12 or a similar material. 4. Connection of hollow profiles according to claims 1, 2 or 3 with the following M e r k m a 1 e n a) The connection is used for door or window frames made of light metal. 5. A compound according to claims 1, 2, 3 or 4 with the following M e r k m a 1 e n a) The connection is welded using the tungsten inert gas process without additional welding material. 6. A compound according to claims 1, 2, 3 or 4 with the following M e r k m a 1 e n a) The connection is soldered with a solder-plated on both sides Sheet metal, b) The shape of the sheet metal corresponds to the outer cross-section of the profile in the cutting plane.