SU1433678A1 - Method of manufacturing tee-joints by multiple-pass welding - Google Patents

Abstract

The invention relates to methods for producing welded structures with T-shaped multi-pass seams, preferably with an automatic one. gas-shielded welding. The aim of the invention is to increase labor productivity by reducing the deposited metal consumption and improving the welding quality by reducing weld deformations and reducing the hydrogen content in the weld. The method includes marking, assembly and welding operations. First, the weld sites of one or two first seam rollers are marked, then these rollers are deposited on a horizontal part without a vertical part, then a vertical part is installed and fixed near the previously welded rollers so that between the vertical part and the part of the seam on the horizontal part there is a gap equal to 1 / 3-1 / 5 tolshr: we vertical parts, then begin to weld parts to be welded, weld welds in the groove between the vertical part I and the previously weld part of the seam to form a weld fused cross section. During welding of the first connecting passage of the seam, the electrode is guided coaxially with the line drawn from the point of maximum penetration perpendicular to the hypotenuse of the largest right triangle inscribed in the weld. 3 or about

Description

The invention relates to the welding industry and can be used in turbine shipbuilding and other industries where pr: - 1 replaces welded structures with tavrovmi multi-pass welds without cutting edges on. vert1-; calio-located parts “The technology is applicable mainly for welding in the environment of protective gases”

The purpose of the invention is to increase the water content. by looking at the | melted metal | and increasing

St; arched current, as well as increasing

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The quality of sEarka with the reduction of welding deformations and the gas content in the metal of the weld pool and the weld

Fig. 1 shows more readily the welding, double-sided tavrovye ss | unity1 in Fig „2 - location of the electrode, when performing the connection of the conductive pass K„ when the seam is done in 3 passes; Fig. 3 shows the location of the electrode, when the seam is made in 2 passes.

The method of drying is as follows.

The shelf 1 (Fig. 1) is deposited 2 ,, a distance of 1 from the edges of the pbJK, the reverse (: nn1X to the wall 3s) is maintained at a surfacing equal to 1/5 d4 1/3 of the tolqiens. distance n14i and the wall after which it was made t its welding with a shelf with a multi-pass weld with metal splitting of the first shaft.

When carrying out passages K. which provide the calculated parameter P U. of the head weld, electrode age ... from: P of the POSKOSTI NQ of this parameter (fig, 2. and 3) this, e "coaxially with the from the point of maximum penetration by the perpene-diculary hypotenuse of the greatest 5 inscribed in a welded sheath right of a triangle ..,

PRI me R. Weld with so-called joints with a wall thickness of 16 mm in carbon dioxide. On a shelf, at a distance of 24 mm from each other, there are two pairs of continuous rollers. 0 Mode-; welding current 490 A;

.

wire feed speed 420 m / h; welding speed 16 m / h; wire brand 08G2S,

After the wall is installed at a distance from the rollers - 4 mm by the next pass with the melting of the rollers, the shelf and the wall are welded. Welding current 380 A; wire feed speed 340 m / h; welding speed 15 m / h.

The quality of the seams is high

The proposed method provides a reduction in the consumption of weld metal of the weld by 20-30%, an increase in labor productivity by 30-40%, incl. 10% due to the possibility of increasing the welding current. In addition, the use of the method allows to reduce welding deformations and to ensure the production of welding joints without gas inclusions.

Claims (1)

Invention Formula A method for manufacturing T-joints by multi-pass welding, in which the mutual arrangement of the shelf and walls is marked, the raten is placed on the shelf and the formed corner joints are welded by a multi-pass weld, characterized in that, in order to increase productivity by reducing the weld metal and increasing the welding current, improving the quality of welded joints by making deformations and the content of gas inclusions in the weld, the first roller is deposited on the shelf, the distance from the edge during its surfacing facing the wall, to the wall, they are held equal to 1/5 to 1/3 of its thickness, the wall is set at this distance and it is welded with a shelf with the metal melted by a roller, and when the layer is made, providing the calculated height of the corner seam, the electrode is positioned coaxially with the line drawn from the point of maximum penetration perpendicular to the hypotenuse of the largest right-angled triangle inscribed in the weld. FIG. 7 FIG. 2 Thebes, 3 Compiled G.Tyutchenkova Editor I.Kasarda Tehred L.Serdyukova Proofreader A.Obruchar Order 5492/13 Circulation 922 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Ra-tpska nab., 4/5 Subscription