DE1234887B - Device on the stud welding device for precise setting of the arc height - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B23k

German KL: 21 h -

Number: 1234 887

File number: K 51429 VIII d / 21 h

Filing date: November 22, 1963

Opened on: February 23, 1967

The invention relates to a device on the stud welding device for the precise setting of the arc height in the welding process.

For arc welding, an arc length that is as constant as possible is essential for a good and uniform one The welding is crucial, because changes in the arc length, especially when the droplet crosses, cause voltage changes in the arc circuit. These in turn cause electricity and Voltage fluctuations in the dynamo. But it depends on these fluctuations in Keeping limits or not appearing at all in the stud welding process permit. The current strength must not drop to low values, and the temperature of the cathode must be allowed do not become too low, as they can then no longer emit enough electrons and the arc would tear off; because a high cathode temperature is the main condition for passing of an arc and for the quality of the weld. In the case of stud welding devices, the arc height is set by pretensioning the bolt to be welded, and it is known that especially with stud welding devices, the arc height must be set very precisely in order to be even to achieve good welding results.

So far there are devices for setting the exact arc height in stud welding devices known, which is also supplied as an attachment to the stud welding device, as required will. These so-called plug-in devices work in such a way that the feet on the stud welding device serve as a touchdown stop while the stud holding device is in the stud welding device with the bolts already inserted is placed on the plug-in device - with the upper part the plug-in device can practically be referred to as a die and the bolt as a punch ■ - ·, then the entire stud welding device is depressed until the stud (punch) hits an in the height-adjustable bolt (to be referred to as ejector) sits on it. Now the whole device has to be done pressed down with stronger pressure until the feet on the stud welding device rest on the plug-in device. This post-pressure stroke is then practically the one set Arc height, and the device is then also biased at the same time. By vertically adjusting the Bolt (ejector), the preload height and thus also the arc height is set.

Mainly, however, the arc height is known to be set so that after inserting the device on the stud welding device for
precise adjustment of the arc height

Applicant:

Kjellberg Electrodes & Machines G. mb H.
in administration, Finsterwalde N / L., Breitscheidstr.

Named as inventor:

Kurt Thor, Bergheide b. Finsterwalde

of the bolt in the holder, the feet of the device can be adjusted so that the bolt is still protrudes about 1 mm. When welding studs with the same length, only one adjustment is then required to be made at the first bolt. The device is then placed on the workpiece, The welding process is triggered by pressing a button on the handle, with the gas flow first is released and after igniting the arc at the same moment the bolt through the pull magnet is withdrawn to arc height. The arc then burns during the dated Relay given time.

After the welding time has elapsed, the welding current and the excitation current of the pull magnet become automatic switched off and the stud is pressed into the weld pool by spring force. The welding process is so ended.

The previously known devices and methods for setting the exact arc height at Stud welding devices have the disadvantage that they can only be used for studs that are exact and have mutually non-tolerant dimensions.

In addition, depending on the skill of the welder, a certain amount of time is required to achieve an exact setting to reach the arc height. Even if the same stud lengths are welded and the arc height only needs to be set once, the bolts point with each other in the length dimensions tolerances, which then in the series welding process the The arc height and consequently the quality of the weld have a negative impact.

When welding bolts with different length dimensions, it must be done again

709 510/449

Claims (1)

3 4 Another setting of the arc height on the stud welding device is faster be taken. Workflow in the manufacturing process through the faster At the same time, the bolt length is also determined by the clamping, and thus the exact definition Construction and setting of the stud welding joints of the arc height, possible, devices limited. Furthermore, the to be welded 5 The invention is to be used below on an execution ßenden bolt in the known facilities approximately example only be explained. In the drawing be straight and must not bend or point Have arches, otherwise the bolt holding device F i g. I the stud welding device when putting on device in the device is unable to hold the bolt. onto the workpiece, with the bolt already firmly in place Since the clamping device has so far been clamped due to the structural design, Education known devices only for certain bolts Fig. Ia the inclination of the device position before lengths and shapes could be used, the purpose is the welding process and during the welding process, of the invention, the stud welding device independently F i g. II the stud welding device in welding of the stud length and the stud shape, development and prestressed stud to be welded, likewise the setting of the arc height 15 F i g. II a the view of the support leg device in ceases to exist and an exact arc height is always available, for each section AB from Fig. II, according to the type of bolt. F i g. III the stud welding device during the According to the invention, this object is achieved by igniting the arc. solves by attaching four support feet to a base plate, which is attached to the bolt welding device on the work clamping device, so that 20 pieces W, on which the bolt B is to be welded, that, in order to achieve the three-point support, with the feet F ₂ (Fig. I to IIa) and ensure that a support foot, namely the rearmost, foot F ₃ , which are attached to the base plate G, is shorter by a pretensioning height to be specified. That put on. The device now has an inclination of «° the entire stud welding device is two middle points to the rear. The foot F ₁ (FIG. I) has support feet that can be tilted at a limited angle from the workpiece. The 25 still has the distance H ₁ . In the loose Bolzenspannvor-device is placed on the workpiece so that the direction Sp , the bolt B is used and up to the entire device, when it sits on the two middle and stop, so up to the workpiece, pushed forward on the rear support foot Inclined position after and then clamped in this jig, this tilt angle forms. By tilting the device around the feet F ₂ (F i g. I) Before starting the welding process, however, in 30 and by the angle forward to the angle α, the inclined position of the stud to be welded so in, the foot F ₁ (Fig. I) on the workpiece reaches the stud clamping device, which is shown in FIG Center un- support and presses the bolt B _1, which is practically located behind the front support leg, on the table is even longer than the support leg F ₁ , with the pretension that it is on the workpiece with the tip, clamping device Sp and holder A and the one in front of which is to be welded on. 35 clamping axis V upwards by the height H _x. Because of To initiate the welding process, the shaft V remains locked in place. The entire device bolted forward by this tilt angle is now pre-tensioned. A stop tilts until the three front support feet of the same length in the stud welding device are precisely defined and form the three-point support. Determined on the basis of the tilting arc height. When the light pressure is ignited forwards, the bolt with the bolt arc is activated by a pulse current of the tensioning device around the pretensioning height according to magnet M (Fig. III) and pulls up and pulls bolt B with tensioning device in place in the pretensioning device Sp and holder A held. The preload stop is the front support leg during the upward tilting of the arc by the height H ₂ (Fig. III). Now it is ready and the welding process can be carried out in a known manner, in addition to the three support feet, and the bolt on the 45. Workpiece. When the arc is ignited, removing the BoI to be welded the stud tensioning device and studs through zens B from the center of the stud welding device the momentum of the pull magnet by the amount of and advance by the amount m (Fig. I) is the Arc height, which is given constant by a stop. Possibility of using different bolts adjustable, raised, and the welding process can be 50 lengths and different shapes, such as curved, be initiated in a known manner. curved etc., to be clamped and on workpieces To weld studs with different lengths. A better observation of the sung and forms, such as B. curved stud welding point is also still given, etc., being able to weld on is the stud clamping device. Likewise, the stud welding device does not need device not centric in the device as usual - 55 removed more axially from the bolt, attached in the middle, but around a certain one but can be pushed away to the side.
Amount in front of the device to enable that in addition the choice of the preload height also includes all claims:
Types and shapes of studs that can be welded with this device. 60 1. Device on the stud welding device for This facility enables precise setting of the arc height, d a - fan means that the arc height when characterized by that at the Welding of the bolts is given exactly. Additional base plate (G) four support feet attached in this way lent there is the advantage that the shape is as well that, in order to reach the three-point support, the length of the bolt to be welded for the one 65 a support foot, namely the rear (F ₃ ) to the position of the arc height is no longer relevant. The prestressing height (H ₁ ) is shorter and the entire and also the construction of the stud welding device around the two, middle ones device no longer influenced. Can be tilted by an angle (α) through this set-up support feet (F _2),