SU1323288A1 - Method of gas-shielded arc welding in narrow groove with transversely oscillated electrode - Google Patents

Abstract

The invention relates to welding engineering and technology. The purpose of the invention is to improve the quality of welding in shielding gases into narrow cutting by improving the melting of the edges. When arc welding in shielding gases, a narrow gas flow is fed into the active spot arc zone in the narrow groove with transverse oscillations of the electrode and the direction of the arc at an angle to the surface of the product. Additional gas flow is fed through a cylindrical nozzle located at an angle of 30-40 to the surface of the parts. The nozzle is moved synchronously with the movement of the end of the electrode. All this ensures the control of the process of forming the seam during automatic welding into slot-hole cutting. 3 ill., 1 tab. with SS (Л 00 к сою 00 СХ)

Description

The invention relates to a welding technique and technology that provides control of the process of forming a seam during automatic welding into a slotted groove.

The purpose of the invention is to improve the quality of the weld by improving the melting of the metal on the edges of the cut.

FIG. 1 shows a diagram of the process of welding into a slit groove with an angle forward; in fig. 2 - section A-A nag of FIG. 1, the boundary position of the electrode and the nozzle; in fig. 3 is a diagram of the welding process in a slit groove top view with an average position of the electrode and the nozzle.

The method is carried out as follows.

Parts 1 and 2 are welded with seam 3. Electrode 4 is placed into the groove at an optimal angle and forms a weld pool during the welding process. Liquid metal is displaced from under the arc by an additional gas noToijoM 6, given by the nozzle 7 at an angle of 0 to the axis of the groove 8. At the extreme position of the electrode 4 and the nozzle 7, the molten metal of the welding bath 5 is shaded from the edge of the part 1 to the edge of the part 2. In the middle position of the electrode 4 and the nozzle 7, the welding metal janna 5 is located symmetrically relative to the axis of the electrode.

Before welding, the curved electrode 4 is immersed in a slotted gap to a depth determined by the thickness of the parts to be welded. At an angle of about 30-40 to the surface of the parts install a cylindrical nozzle, the internal cross section of the gas channel facing the surface of the weld pool 5.

The choice of angle 0 30-40 ° produced by experiment.

The welding data by the proposed method is given in the table.

Example. Automatic argon-arc welding of pipes 0 140 mm with a wall thickness of I5 mm into a slotted width of 8 mm is carried out with the flow of gas flow into the weld pool and

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without him.

Welding is performed on the following.

mode: welded. 1 current 150 A; CKopocTb j the welding arc is directed at a welding angle of 5 m / h; wire feed speed to the surface of the product, I distinguish loki 20 m / h; the diameter of the filler is simple, and so that, with a view to an increase of 1.6 mm; angle of inclination of the electrical quality due to the improvement of yes 15 ° (given by technical recommendations; melting of the edges of the groove,

datsi); diameter of a tungsten electrode 4 mm; electrode oscillations 1.2 s; vibration amplitude 2.5 mm; shielding gas consumption 15 l / min. Material pipe ZOHGSA.

An additional gas flow is fed to the welding spot of the bath through a tube (nozzle) of 2 mm set at a distance of 5 mm from the surface of the weld pool at an angle of 30 °, with a gas flow rate of 3 l / min. oscillation frequency of the electrode so that the gas flow moves synchronously to the movement of the end of the electrode. Since the amplitude of the oscillations is quite small, and the gas flow creates a pressure spot, greater “neck” of the size of the welding spot due to its inclination to the surface of the product, for all relative positions of the end of the electrode and the nozzle of the gas tube, the molten metal is effectively displaced heating zones.

In the study of macro-pins of welded joints, it was found that non-fusion at the edges and interlayer fusion are completely absent in joints welded using an additional gas jet, moving synchronously with the end of the electrode. one

Using a welding method with an impact, an additional gas flow, moving synchronously with the electrode, to the weld pool during automatic welding of thick-walled joints with a slotted groove makes it possible to obtain a stable penetration depth, a smooth, smooth surface without undercuts on the edges, a concave shape of the groove and no defects in the form of non-fusion. In addition, the synchronous movement of the electrode and the nozzle of the additional gas flow ensures the absence of fusions along the edges.

Claims (1)

Formula invented the shadows The method of arc welding in protective gases in a narrow with transverse oscillations of the electrode, in which 313232884 the active spot of the arc meets the dvnzhe-surface of the product and displaces the electrode with an electrode supplied additional synchronously with the movement of the end the electrogas flow at an angle of 30-40 to Tilt angle Weld quality The weld surface is unsatisfactory. The depth of proplavlenin has been reduced. Compared with the prototype. Defects such as non-fusion were not observed. Also , The seam surface is good. There are no defects. Also There is a defect - non-fusion at the edges. The surface of the seam is satisfactory. | ca. fpus.i Aa fi & .b