SU1316767A1 - Method of multiple-electrode welding - Google Patents

Abstract

The invention relates to the field of arc welding in shielding gases with a non-consumable electrode. The aim of the invention is to improve the quality of the welds. The electrodes are placed on both sides along the junction, assembled with a gap in two parallel rows at a distance exceeding 1.5-3.0 times the width of the gap. In this case, the electrodes of one row are shifted relative to the electrodes of the other row by half the distance between parallel rows of electrodes. The arc is excited on each subsequent electrode of one row after a time equal to half the period of burning of the previous arc on the nearest electrode of another row. The displacement of the electrodes and the indicated sequence of arcing ensure the high-quality formation of the seam. 3 il.

Description

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The invention relates to in-gas arc welding with non-consumable electrodes.

The purpose of the invention is to improve the quality of welded joints assembled for welding with a gap.

Figure 1 presents the scheme of the implementation of the proposed method; figure 2 is the same, top view; Fig. 3 is a program for changing the current on two rows of electrodes.

The method is carried out as follows.

Non-melting electrodes 1 are placed along the junction in two parallel rows (Fig. 1) 5 spaced apart from each other at a distance A greater than 1.5-3.0 times the width S of the gap in the junction. In this case, the electrodes of one row are displaced relative to the electrodes of another row at half the distance a between the electrodes of the row (Fig.2), and an arc is excited on each successive electrode of one row after a time equal to half the td / 2 period of the previous arc on the nearest electrode of the other row (Fig. 3) Displacement of the electrodes, as well as the indicated sequence of mountains Yeni arc on the electrodes provides uniform heating and melting of the edges to be welded and high-quality formation of the seam When the electrodes are different from. We offer a non-uniform heating of the edges being welded, areas with non-fusion are formed on the weld, which degrades the quality of the joint. When welding with a fixed arrangement of electrodes 1 in two rows above the weld edges 2, a good quality of the seam is provided. which must not exceed half the thickness of the CBapHBaei Mx parts. There is also no need for oscillations of the arc and a decrease in the welding current when the arc passes a gap, which simplifies the execution equipment.

the knowledge. The proposed method also involves laying the filler metal into the gap between the edges of a vsluchae, if its value exceeds the value of the equivalent, equal to half the thickness of the welded parts, which contributes to the high-quality formation of the seam.

The proposed method is used in the welding of butt joints of a composite profile (angle, tee, etc.), in the manufacture of products in assembly conditions.

PRI me R. The parts were welded on the steel of UPU-2, assembled with a gap of 1 mm.

55 Distance between the cores of electrodes 3 mm. The offset of the electrodes of one row with respect to the electrodes of the other row of 1.5 mm. The arcing current is 65 A. The proposed method allows to obtain a high-quality welded joint of the joints assembled with a gap, and can be used in the butt-welding of various joints with an unsatisfactory build quality.

Claims (1)

Invention Formula The method of multi-electrode welding with non-consumable electrodes located along the welded-butt joint assembled with a gap, with a yotor, successively moves the arc from the electrode to the electrode, which differs from improving the quality of welded seams, non-melting electrodes are placed on two sides along the junction in two parallel rows, spaced 1x from each other at a distance exceeding 3.0 times the width of the gap in the junction, while the electrodes of one row are shifted relative to the electrodes of the other row by half the distance between the electrodes. placed in a row and arc excite on each successive electrode of one row after a time equal to half the period of burning of the previous arc on the nearest electrode of another row. figure 1 S f.c  D /// VV / 3cff. tc V / tu (.: y (pus.2 Editor M.Tovtin Compiled by G. Tyutchenkova Tehred L. Oliynyk Proofreader T. Kolb Order 2383/10 Circulation 975 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. O), 4