DD265575A1 - DEVICE FOR BATHROOM ASSURANCE IN LIGHT ARC WELDING - Google Patents

Abstract

The invention relates to a device for securing the bath during arc welding, which is suitable for butt joints in dynamically highly stressed structures of mechanical engineering. Field of application is especially vehicle construction. According to the invention, a plate is placed under the butt joint as a welding bath fuse which, after the end of the arc, is delayed in time by an oscillating force exciter to produce small oscillatory amplitudes. The surface tension and mass forces of the liquid molten metal are thus used to shape the weld seam. It is characteristic that the small oscillation only changes the arc length so that the welding process remains very stable. The liquid melt is energized by its low mass to movements that allow a clean Schwebadbadentgasung. figure

Description

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Field of application of the invention

The device according to the invention is preferably suitable for butt joints in dynamically highly stressed constructions of machine and vehicle construction.

Characteristic of the known state of the art

It is known, preferably butt welds to weld on a Schweißbadsicherunj. Known types of weld pool fuses are:

- ceramic plates

- Kupfersch'eiie

- attached sheet metal strip

- Powder pillow

- Hoizgasflamme

- welded root

- Internally glued plastic powder strips

- worked bevel.

Ceramic tiles are rigid small elements that allow for any seam lengths by lining up. Are known

Also versions with grooves in these platelets, so that the liquid weld metal forms a good Wurzelahtform by this groove.

The heat storage capacity of the ceramic materials allows a slow cooling of the weld metal. Metallic weld fuses are basically rigid metal bars (e.g., copper, chilled and uncooled) so that

An exact adaptation of the weld pool protection to the factory pool is necessary. It is allowed between the

Welding and the workpiece can not get liquid weld metal. This version is favorable for

special »Root shapes, which can be achieved by a special groove design. Preheated copper bars provide particularly good seam shapes.

If you use a metal strip as a backup, so this must fit snugly. The stapling of this sheet metal strip is done

always in the seam joint, so that the stapler is reflowed during welding. Otherwise these are

Welding pool fuses can only be used for static or higher-level components with a remaining stapler. It is also known

to leave the under-stitched metal strip in special cases.

Powder cushion »la Welding protection are preferably used in UP welding. The contact pressure in Root area Itt by the fine grain evenly. Since the powder is easily melted, the prevention of the Air passage from below. A fuel gas flame as a bath fuse is compared to the machine welding torch at a certain distance

arranged according to the workpiece thickness and electrode diameter (TIG-Schwaißen) or wire diameter (MAG method). The surface tension of liquid metal melts causes the root layer to form well, and the

Gas and flow pressure of the hot gas flame supports the liquid root area. Embodiments are also known where the root is carefully executed by means of special manual methods (eg TIG). The filling

The gap then takes place using any desired high-performance method.

The under-glued plastic powder strip wi / d unwound from the roll and can by its self-adhesive property directly

A thin, poorly heat-conductive powder layer prevents fast movement

By firing. After the welding process, the heat-resistant plastic film is easily peelable. She is only once

usable.

In special applications, if the joint shape is machined, it is also possible to use a sweat-wicking chamfer

be worked on. Labor-intensive and expensive bathing is the exception.

Most weld fuses deal with probe dies, so the fuses are the special ones Adjust the geometry of the components. This is also shown in DE-OS 2920650. Here, the invention relates to a Bath fuse element for one-side welding, which under dull stump to be welded together metal workpieces

releasably underlaid in the connecting joint. It is within the scope of the invention, the root mold and its holding him

Carrier profile in a variety of shapes and fill the respective ScHw ».ßnahtver!

adapt.

A special form as a bath fuse elemont was shown in the OD-PS 2 7453. Field of application of this invention is the Schwoilibadsicherung in the mechanical root welding of butt welds (long or round seams), especially in Rundnahtechweißen small rot-förmiqer workpieces.

A direct mode of action η influence of external forces on the seam design and cleanliness of the seam (avoidance of pores by improved adaptation) or other methods are not known.

Object of the invention

With the Schweißbadsicherung invention, the disadvantages of the known technical solutions should be avoided and created for special applications in arc welding a device with a weld pool, which slciv characterized by a long service life and higher welding speeds and without additional effort and better Schweißnahtquaütät.

Explanation of the essence of grounding The invention has for its object to provide a weld pool, which is suitable for butt welds without

additional effort to allow an improved quality of Fügostelle with optimal re / erwendbarkeit the

Badsicherungsschiene. According to the invention the object is achieved in that placed under the butt joint as Schweißbadsicherung a plate

is too small after the ignition of the arc with a short time delay by the vibrating force

F-'iwingamplituden is excited. It is characteristic that the amplitude is small and thus the length of the arc is changed only so that the Welding process remains very stable. The liquid molten bath is excited by its low mass to movements, the one

enable clean Schweißbadentgasung. There is an excellent mixing of the melted

Workpiece flank parts (joint) with the additional material. Since an ideal straightness of the seam quality can not be achieved, different gap widths must be used

thermal seam preparations are calculated. Welding pool fuses allow to achieve higher technological safety.

Erfindungsgemäf! become the surface tension and the mass forces of the molten metal in the arc region

used to shape the weld. The mass forces are intensified during shaking, so that the heavy mass fractions concentrate at the bottom and the root, which is highly stressed during loading, has a completely defect-free structure.

For multi-layer seams it is possible to switch off the shaking process for the intermediate layers. AukfQhrungsbelspiel The invention will be explained in more detail below using an exemplary embodiment: Pig. 1: Construction of a device with representation of the mode of action of the weld pool fuse

It is a fusion welding connection with the MAG welding torch 1 are produced. The workpieces 2 form a butt joint with the weld 3, which lies on a weld pool 4 during the joining process. The clamping or mounting of the workpieces 2 takes place by means of clamping plate 5 and the magnetic plate 6. This holder also serves as an accurate positioning, where only the Wufrelspalt must be precisely controlled and adjusted manually. The distance between the symmetrically arranged magnetic disks is so great that the magnetic field does not affect the arc. The Schweißbadsicherung 4 is arranged on elastic Zwisch6nlagen, which in turn are connected to a Schwingkrafterroger 8, which has an adjustable amplitude and oscillation frequency.

Claims (3)

1. A device for securing the bath during arc welding for butt welds, characterized in that under the butt joint of the weld (3) there is a weld fuse (4), which is connected via elastic intermediate layers (7) with a vibration force exciter (8). 2. Device according to claim 1, characterized in that the clamping of the workpieces to be welded (?) Takes place by means of clamping plates (5) and magnetic plates (6). 3. Apparatus according to claim ', characterized in that the Schwingkrafterroger (8) has a settable amplitude