SU1237347A1 - Method of multielectrode arc working of metals - Google Patents

Description

one

The invention relates to arc welding and can be used in welding long seams, for example, in the manufacture of pipes, as well as in shipbuilding.

The aim of the invention is to improve the quality of the weld when welding with several electrodes, one of which is tape, into a common melting space.

The drawing shows a device explaining the proposed method, where 1 is a tape electrode; 2 - wire electrodes; 3 - weld.

According to the proposed method, the ribbon electrode is positioned longitudinally along the path of travel, and on both sides of it the wire electrodes are symmetrically positioned at a distance from the leading edge, which is within 1/4 to 1/3 of the width of the mite.

When the wire electrodes are located at a distance of more than 1/3 of the tape width, the heat input in the fusion zone decreases, the surface tension increases, and the cooling rate of the liquid metal increases, which leads to the formation of undercuts. When the wire electrodes are located at a distance of less than 1/4 the width of the tape from the front edge, there is not enough heat input in the front part of the crater, as a result of which the arc on the wire electrode deflects backward, which leads to the formation of undercuts as the speed increases.

0.7-1.1

0.3-0.8

Unstable 1 2900-ZZOOA

and 29-ЗЗВ 1 2600-3200

Uraven-U 30-36B dimensional formation of suture co iiriy

welding and limits the increase in automatic welding performance. In addition, insufficient heat input in the front part of the crater leads to an increase in the current flowing through the front wall of the bath and directed downward of the electromagnetic force, which throws the liquid metal into the tail part of the bath, resulting in the formation of welds is disturbed.

Dp example was carried out two-way butt-welding without cutting the edges of samples of size 9150 900 mm from st 09G2S with a different arrangement of wires, and a tape electrode. The arrangement of the wires and the ribbon electrode was adjusted by changing the position of the guide electrode relative to the wire electrode. The electrodes were short-circuited onto the product, covered with a layer of flux and excited an arc. During the welding process, the electrodes were applied at the same speed. A VMG-5000 rectifier was used as a power source. Welding was performed on a direct current of reverse polarity under the flux AH-348AM. The SV-12GS wire with a diameter of 4 mm and a tape of 08 kn with a cross section of 5 mm and 60-0.5 mm were used for welding. Supply of electrodes in options 1, 2 and 3 125 m / h | on options 4, 5 and 6 144 m / h. The results of the influence of the location of the wires relative to the leading edge on the performance of the process and the formation of the weld are summarized in table 8, 7-9.5

.140.0 502700

8.0-9.5

140.0 500600

ABOUT

0.8-1.2

0.4-0.9

Stable I 3000-3200A 9.0-9.5

U 30-32B

Unstable

I 3000-3400A

and, 28-32В

Unstable

1 2800-3400А

U9 28-34B

Stable

1 3000-3200А

and 30-32V

, 2-9.1

7.7-9.0

9.0-9.5

Note. The welding mode was recorded by recorders. Depth

the undercut was measured with a dial indicator with a special prefix.

Editor A, Gulko

Compiled by E, Somova

Tehred G.Gerber Proofreader G. Reshetnik

Order 3230/13 Circulation 100 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Table continuation

140.0 502700

, 2-9.1

140.0

502200

7.7-9.0

140.0

502700

9.0-9.5

140.0 502700

Claims (1)

METHOD OF ARC MULTI-ELECTRODE METAL TREATMENT is predominantly for welding with a longitudinal arrangement of a tape electrode, in which an additional wire electrode is symmetrically placed on each side of the plane of the tape electrode and the process is led into a common floating space, characterized in that, in order to improve the quality of the weld , the wire electrodes are placed at a distance of 1 = (l / 4-l / 3) L from the leading edge, where L is the width of the tape. yo with m with m > I 237 34 7