SU496128A1 - Submerged arc welding method - Google Patents

Description

one

This invention relates to the field of automatic welding under a flux layer.

The method of submerged-arc welding with the supply of steel electrode wire to the arc zone, in which a metal granulated additive is prevented from entering the gap between the sheets of metal being welded, is known.

In this method of welding, the edges of the sheets (especially in the lower part of the cut) and the filler material are sometimes poorly melted, with the result that there are incomplete fusion, pores and other defects in the seam. The reason for this is an insufficient amount of heat supplied to the lower part of the welding zone with a large amount of filler material.

To improve the quality of the weld metal, increase the penetration depth of the base and filler metal according to the proposed method, from 10 to 100% of its weight, oxides of elements with low affinity to oxygen and an active deoxidizing agent in the liquid state are added to the additive; under

| flux, prevent additional arc, hot in an inert gas, which serves the wire from the material deoxidizer.

In some cases, there may be

It is advisable to add some aluminum, magnesium or titanium to the filler metal.

Filler material can be used in powdered or pressed form and stir it along the entire length of the groove or in those places where it is necessary to increase the heat generation and penetration depth.

Welding is carried out with two arcs.

(welding heads, semi-automatic) at the same time or for two progoda.

In the beginning, metal sheets are arc welded, hotter in inert gas, with

using aluminum (titanium) filler wire. Thus, in the seam groove (along its entire length), liquid aluminum is introduced with a slight excess with respect to the oxides of the metals that were in the groove. For example, in a ratio of 1: 2, 1: 1 termite). With this method of introducing aluminum (titanium), more filler material can be introduced into the seam cutting, and the exothermic reaction proceeds more vigorously.

Immediately after the excitation of the exothermic reaction, the further welding of the sheets is carried out in an elevated mode with an arc, hot submerged-flux, with the supply of steel wire. In this case, an excess of aluminum (titanium) interacts with metal oxides, which are part of the flux, and restores them, thereby providing additional deoxidation and alloying of the weld metal due to the elements included in the flux, as well as an increase in the deposition rate and heat As a result of the total heat produced by the exothermic reactions of aluminum (titanium) with oxides in the additive and in the flux, it is possible to significantly increase

welding performance and depth rtpon-l peeling, to improve the quality of the seam, to weld a metal of greater thickness without cutting edges.

Claims (1)

Invention Formula The method of submerged-arc welding with the supply of steel electrode wire to the arc zone, in which metal 1Granzchgaravan55 k) additive is placed in the gap between the sheets of metal being welded. t from 10 to 100% of its weight are oxides of elements with a small agent for oxygen and an active deoxidizing agent in the liquid state, For this, an additional arc burning in an inert gas, into which the wire from the deoxidizing material is fed, is placed in front of the arc under the flux.