SU397288A1 - In PTB - Google Patents

Description

The invention relates to electric fusion welding and is intended for automatic welding by split (dual) submerged-arc strip electrode, as well as in a protective gas atmosphere.

A known method of welding with a split electrode, in which the tape electrodes are fed into the welding zone symmetrically to the longitudinal axis, to which the electrodes face their wide side.

However, the known method limits the adjustment of the penetration shape, which is a necessary condition for the reliable penetration of the welded edges in the root part of the seam. In order to obtain maximum seam width, the distance between the electrodes is increased, which leads to a split seam top and lack of penetration in the saddle area.

The purpose of the invention is to improve the quality of welding.

It is achieved by the fact that the distance between the front edges of the tape electrodes is kept constant during the entire welding process, and the distance between the rear edges is always set greater than the distance between the front edges, changing it in the welding process is proportional to tr, the width of the width is not 1.

FIG. 1 shows the location of the electrodes during the welding of the first layer of a two-layer butt weld with a V-shaped groove; in fig. 2 - the same, top view; in fig. 3 - the same, when performing the second facing layer; in fig. 4 - the same, top view.

For welding with a split tape electrode according to the proposed method, both

electrode width A, fed to the melting zone symmetrically to the longitudinal axis of the seam with wide sides oriented to it, are arranged so that their non-rare edges Ucs 2 and 2 are spaced apart by distance a to ensure that the first layer 3 is optimal for this welding mode boil HI. The distance a is chosen depending on the type of the welded joint and the thickness of the metal being welded, is set using a regulating device of a special mouthpiece when setting up the welding machine and kept constant during the welding process. Back edges 4 and 5 tgkzhe. regulating device mouthpiece

spread apart bi, exceeding the distance a, to evenly melt both walls of the groove with the width BI of the first layer 3. The distance & i is adjusted during the welding process as applied to local

relief of the welded joint.

When welding the cladding layer 6 (Fig. 3-4), the alignment of the rear edges 4-5 is increased to the distance b, which provides for the overlapping of the butt-splitting width B by the facing layer 6 of width B and penetration I

An increase in the seam width without changing the heat input energy is due to the dispersion of arc heat.

Subject invention

The welding method with a split ribbon electrode, in which the tape electrodes are supplied to the welding zone symmetrically with respect to the longitudinal axis of the seam, to which the electrodes are worn with their wide side, characterized in that, in order to improve the quality of welding, the leading edges of the tape electrodes during welding are kept constant during the welding process, and the distance between the back edges of the electrodes establishes more distance between the leading edges and changes during the welding process in proportion to the width of the weld.

four

FIG.