SU1018822A1 - Method of arc welding of aluminium alloys - Google Patents

Abstract

METHOD FOR ARC WELDING OF ALUES OF MINI ALLOYS by modulated current, characterized in that, in order to increase the process stability during welding with melting electrode, modulated current is obtained by applying a constant current of 0.3-0.5 DC to an alternating current. (L 00 00 1C isd

Description

The invention relates to arc welding and surfacing of non-ferrous metal structures. A known method of welding non-melting electrodes in an inert gas medium with a continuous arc of alternating current, in this case constant current of different polarities is alternately introduced into the welding circuit with separate control of the magnitude and duration of its action. The disadvantage of this method is . In addition, the non-consumable electrode burns out in the welding process, breaks, inclusions remain along the entire length of the seam, thereby reducing the strength and other mechanical properties of the weld. The aim of the invention is to increase the stability of the process during welding with a melting electrode. This goal is achieved by the fact that, according to the method of arc welding of aluminum alloys by a modulated current, the modulated current is obtained by applying a constant current of alternating current of 0.3-0.5 DC currents. The drawing shows the oscillogram modulated current, which explains the arc process (T is the cycle time; t c is the current pulse duration; t j is the duration of the pause between pulses; 3 is max 3f. Is the minimum current value; current value). 22 The welding process is carried out with the following braz. With modulated current, obtained by applying an alternating current to the industry; frequency to a constant welding voltage. Aluminum alloys are being welded. In this process, the baseline welding current is direct current, which has a high Goyno and the stability of the welding arc. The applied alternating current in addition to direct current increases the electrodynamic force and removes a drop from the tip of the melting electrode. At the same time, the electric sham force, arising from the passage of alternating current, has a compressive effect on the arc plasma of the welding arc, concentrates it and reduces the spot arc on the product being welded. The jet transfer of the electrode metal into the bath is carried out with high stability and low spatter. The seams are formed with small flakes with a silvery-white surface. The approximate modes of semi-automatic welding of vertical welds on the reverse polarity with application of alternating current of industrial frequency to direct current during welding of aluminium alloys are characterized by the figures given in the table.

AMG-5

0.05 Jet-Argon 1.6 170-190 ny

1.6 170.190

ЖГ ЖЖЖгХ (ГЖМ.

1.6 200-220

f 110-120 60-70 18-19 6-8 40-50 AMG-5

J40-150 30-40 18-19 6-8 140-150 60-70 19-20 8-9 50-60 AMG-5 170-180 30-40 Preim) ptosetvom spos (it is stable, process stability, quality increase uiboB

Table continuation

8-9 From bottom to top, seam is not fortiped 8-9 From bottom to top, mont fort 1 is installed 8-9 from bottom to top, seam is formed 19-20 -9 8-9 Just put the seam. | does not form j and the performance of alyumgashkvyh sshshov topostennyh and thin-walled fortifications.

Claims (1)

METHOD OF ARC WELDING OF ALUMINUM ALLOYS with a modulated current, characterized in that, in order to increase the stability of the process when welding with a consumable electrode, the modulated current is obtained by applying an alternating current equal to 03-0.5 of direct current to a direct current.