DE1941393U - ARC WELDING DEVICE. - Google Patents

Description

The innovation relates to a device for arc welding workpieces, preferably sheet metal on buttocks.

It is known to weld metal sheets after a Manufacture of inert gas welding process with melting, automatically fed electrode. With this so-called The MIG process is generally carried out in such a way that first the two sheets are joined by a root seam are connected, on which then subsequently one or, if necessary, several layers of the welding material for filling applied to the joint. This way of working requires

LINDE AKTIENGESELLSCHAFT

not only takes a relatively long time, but also involves a large amount of shielding gas., which in many cases is not economically viable.

The present innovation is based on the task of developing a device that welds of workpieces, preferably sheet metal, abut quickly and, in terms of the quality of the weld, reliable, with a noticeable reduction in operating costs.

This object is achieved by a device in which two welding heads are rigid in terms of their spacing of arbitrarily adjustable connection with respect to the weld seam are arranged one behind the other, wherein the front welding head is a gas shielded welding head and the rear is a submerged arc welding head.

This device allows a particularly advantageous operation when the with respect to the welding direction the front of the two welding heads arranged one behind the other, namely the inert gas welding head, preferably works with a melting, automatically fed electrode, and welds a root seam while filling the weld joint immediately after the root seam has solidified with the subsequent submerged arc welding head he follows.

LIMDE AKTIENGESELLSCHAFT

With the device according to the innovation, it is only necessary to carry out a fraction of the weld seam, namely the root seam, using the inert gas welding process, while the remaining volume of the weld joint, which can have an X- or V-shaped profile, for example, is filled using the submerged arc welding process . The first execution of the root seam according to the inert gas welding process offers security against the weld pool and the liquefied welding powder running off through the seam, which means that if the submerged arc welding process is used exclusively, especially in the case of, for example, poor preparation, the abutting edges that do not fit perfectly Sheets, must be expected. On the other hand, the preferred application of the submerged arc welding process results in decisive cost savings that are in the order of magnitude of yo / o compared to pure gas-shielded welding.

In the device according to the innovation can

the front welding head, which works according to the inert gas welding process, performs a pendulum movement across the seam. With this oscillation of the welding head, which is known per se, sheets with poorly prepared edges can also be used can be welded with fluctuations in the gap width of up to 6 mm without having to fear that the

LSMDE AKTiEMGESELLSCHAFT

The weld pool flows downwards. Without oscillation, the gap width for gas-shielded welding must not exceed 1.5 mm, and for submerged arc welding, Oj8 mm. The Schwirgungsfrequenz the pendulum, depending on the welding speed between Jo and 2oo oscillations per minute, while the amplitude may be mm up to 25th

The device according to the invention is expediently designed in such a way that the inert gas welding is carried out as well as the submerged arc welding takes place from the top of the sheets, but the execution of the root seam may also be done from below. It is only important that with submerged arc welding there is no solid or Liquefied powder runs down through the weld joint.

In the device according to the innovation, the two welding heads are on a common feed device arranged one behind the other in a rigid connection. The distance of the first, after the inert gas welding process working welding head from the second welding head working according to the submerged arc welding process can be set as required and depends, among other things, on the welding speed. Essential for the correct setting of this distance is in each case that the root seam laid by the first welding head

LlHDE AKTIENGESELLSCHAFT

at the point where the second welding head is located, is already frozen. It has proven to be advantageous to choose this distance not less than 10 mm.

Further details of the innovation can be found in the exemplary embodiment shown schematically in the drawing can be removed.

In this embodiment of the device according to the innovation, 1 and 2 are the two welding torches, which are arranged one behind the other in a rigid connection on a common feed device (not shown). 1 is a gas-shielded welding torch in which the shielding gas passes through a cavity 4 flows. 2 is a submerged arc welding torch in which the welding powder (indicated by dots) is passed through a die Electrode 5 surrounding cavity 6 trickles onto the weld pool. The two welding torches 1 and 2 are through, for example two tabs 7 fixedly connected to one another by a screw 16. After loosening the screw 16 can The distance between the welding torch can be set as desired by moving the tabs against each other.

In the example shown in the drawing, the two thick workpieces 9 and 1o are through a so-called X-seam welded together. When this weld is carried out, the feed device moves

with the two welding heads 1 and 2 in the direction of the Arrow 11 along the X-shaped prepared gap 12 between the two stationary workpieces 9 and 1o. However, it is also possible to set up the device carrying the two welding heads 1 and 2 in a stationary manner and the Workpieces in a direction opposite to arrow 11 to move under the welding heads 1 and 2.

The inert gas welding head 1 at the front in the welding direction welds the root seam Λ ~ 5> which closes the X-shaped gap 12. The submerged arc welding head 2 follows at a distance which is selected so that the root seam 15 is already solidified when the submerged arc welding head 2 arrives. By submerged arc welding, the gap is filled with a thick layer 14 and the melt is covered by a layer 15 of welding powder.

Pur the case that the gap 12 between the workpieces 9 and 10 relatively wide or more irregular Form is, further means known per se (not shown) provided that allow the submerged arc welding head 2 to oscillate in the direction of arrow 17.

Instead of the first welding head 1, which after the inert gas welding process with melting, automatically fed electrode works, a Welding head that works according to the so-called TIG process,

LIMDE AKTIENGESELLSCHAFT

d. H. with non-consumable electrode, can be used, whereby a metallic filler material is electrolessly inserted into the melted base material during welding is introduced.

2 claims for protection 1 drawing

Claims (2)

1. Device for arc welding workpieces, preferably sheet metal, butted, characterized that two welding heads (1, 2) in rigid, freely adjustable with regard to their distance Connection (7, 16) with respect to the weld seam are arranged one behind the other, the front Welding head (1) is an inert gas welding head and the rear (2) is a submerged arc welding head. 2. Apparatus according to claim 1, characterized in that the distance between the two welding heads is at least 1o mm amounts to. «D *. Lower ****** «*
The originally submitted sub-boxes ob ^ ^ Srtn ^ oh submitted Untortog "Wmdjn s, chln d" a "legal interest" free of charge. wwcten. AUt negative at the usual prices. , _{mmi For} . _T ,,,,, _n ^ _Hlm .