SU878471A1 - Method of electroslag welding of large thickness articles - Google Patents

Description

one

This invention relates to welding production.

There is a known method of welding rectilinear seams of a large extent, in which a large section electrode is installed in the gap between the welded billets, consisting of a set of separate plates, having, as a rule, one channel for supplying the electrode wire 1.

The uniformity of penetration along the entire length of the welded blanks depends on the number of electrode wires. The larger the wire electrodes and the smaller the distance between them, the more uniform the penetration of the edges being welded will be.

However, with an increase in the number of electrode wires with their distribution throughout the entire length of the weld with large thicknesses, the process itself and the equipment become very complicated, which ensures it.

In addition, the installation and insulation of each individual plate is complicated. With a long weld length, it is difficult to ensure that the plates are installed in the same vertical plane, which leads to an increase in the gap between the welded blanks, and, as a result, this leads to an unjustified increased consumption of expensive electrode wire.

The aim of the invention is to simplify the process of welding and equipment, ensuring it, while maintaining uniform penetration of the edges to be welded.

5 The goal is achieved by the fact that the electrode wires are fed with an increased dry overhang.

FIG. 1 shows a device for carrying out the proposed method; on

10 of FIG. 2 shows section A-A in FIG. one.

. The electrode wire 1, placed in a non-conducting tube 3 installed separately from the electrode 2 of a large cross-section, is concentrated only in one place of the gap 4 in the area of 0.1-0.3 of the length of the weld. Over the entire remaining length of the gap 4 between the welded blanks 5, an electrode 2 of a large cross section is installed.

20 Having established the forming sliders 6, they lead a slag bath of the required depth, and, using the dry overhang of the electrode wire 1, they conduct an electroslag welding process.

25 The proposed method allows the electrode wires to be installed and supplied outside the gap area between the welded billets, for example, into the space formed by a recess in the forming slider 6,

30 designed to reinforce the seam. In that

In this case, the consumption of electrode wires is significantly reduced by reducing the gap 4 between the welded blanks.

Feeding the wire into one place allows you to simplify its feeding equipment, provides the ability to carry out and adjust its dry reach. All this allows to increase the welding speed while preserving the quality of the welded joint.

According to the proposed method, the beam was welded from two cast billets of art. GOLD Weldable section - 600x1200 mm. The number of electrode wires is 2. The cross section of the consumable electrode of a large cross section is 20X550 mm with a gap between the welded billets of 28 mm. Dry overhang of electrode wire - mm. The voltage on the electrode wires is B. The voltage on the large section electrode is B. The feed speed of the electrode wires is 780 m / h. The current on the electrode wires is 400-4500 A. The current on the large section electrode is 3000 A.

Welding by the proposed method ensures a stable process, uniform penetration of edges, high-quality welding seam. The welding speed was 1.8 m / h. The equipment for duplicating the wire electrode supply and its maintenance during the welding process has become much simpler.

In addition, the proposed method allows one to feed the required number of electrode wires in a beam through one ceramic non-electrode channel. In this case, the cross section of the channel should ensure the placement of wires with the possibility of shifting them relative to each other.

Claims (2)

1.Sushchuk-Slyusarenko I.I., Lychko I.I., Kiev, “Naukova Dumka, 1974, p. 57, fig. 32. 2. USSR author's certificate number 126567, cl. At 23K 25/00, 11.05.1959 (prototype).