SU1581508A1 - Method of slot-groove welding with consumable electrode - Google Patents

Abstract

The invention relates to the welding of steel and alloys of large thickness into a slotted groove and can be used in various industries. The purpose of the invention is to improve the quality of welding by adjusting the depth of penetration of the edges being welded. The floating electrode 1 is deformed before entering the burner 2. Then, the rotational oscillations across the cutting of parts 3 having a width B are attached to the electrode. At the exit of the mouthpiece 4 at the offset L, the electrode is bent with a given radius R = 0.5B .L / ϕ. The electrode oscillates from one edge of the cut to the other with a frequency F = (1.5-5.0) V St / B, where V St is the welding speed. The electrode is directed to the edges to be welded at the extreme points at an angle α = 15-28 °. The welding method makes it possible to reduce the number and extent of low-temperature microcracks. 2 ill., 1 tab.

Description

one

(21) 4483880 / 25-27

(22) 9/19/88

(46) 07/30/90. Bul № 28 (72) V.A. Kazakov, V.I. Kulik, V.O. Tokarev, OM Novikov, V.P.Chudinov, L.A.Danilov and A.P.Kuryndin

(53) 621.791.75 (088.8)

(56) USSR author's certificate

No. 473576, cl. At 23 K 9/00, 09.12.71.

(54) METHOD OF WELDING BY A GLAVING ELECTRODE IN A SNAP STITCH

(57) The invention relates to welding steels and alloys of large thickness into a slotted groove and can be used in various industries. The purpose of the invention is to improve the quality of welding by adjusting the depth of penetration of the edges being welded. The floating electrode 1 is deformed before entering the burner 2. Then, rotational oscillations across the cutting of parts 3 having a width b are attached to the electrode. At the exit from the mouthpiece 4 on the outreach 1, the electrode is bent with a given radius R 0.5L-1 // G. The electrode oscillates from one edge of the cutting to the other with a frequency of Ј (1.5-5.0) usv / b, where VC8 is the welding speed. The electrode is directed to the edges to be welded at the extreme points at an angle of ot 15-28 °. The welding method can reduce the number and extent of peri-mic microcracks. 2 ill., 1 tab.

SL

The invention relates to the welding in shielding gases of steels and alloys of large thickness into a slotted groove and can be used in many industries.

The aim of the invention is to improve the quality of welding by adjusting the depth of penetration of the edges being welded.

On gig. 1 is a diagram illustrating the welding method; in FIG. 2 - section aa in figure 1.

The method is carried out as follows.

Before entering the burner 2, the floating electrode 1 deforms by means of a special mechanism (not shown) and gives it rotational vibrations across the groove of the welded parts 3 having a width b.

Electrode 1, when exiting mouthpiece 4 at outreach 1, is bent with a given radius R OjSb1 /, oscillates from one edge of the groove to the other with a frequency f (5-5.0) Ve & / B and is directed to the edges being welded at the extreme points 5 at an angle of ol 15-28 °.

The depth of penetration of the edges being welded is controlled by parameters that determine the amount of heat input to the walls of the groove: the bending radius of the melting electrode R, depending on the width of the groove b, the departure length 1 and the defining angle of the electrode to the surface of the parts; corner

five

5o

: L

i

the meeting of the electrode with the walls of the frame о (depending on the effective power of the arc; the oscillation frequency of the electrode f, depending on the heat input and the width of the groove b.

Example. Welded parts made of nickel alloy VZhL-14. The thickness of the edges to be welded is 25 mm, the width of the groove in the lower part is 9 mm.

Welding wire CB-X15N70M (EP-3.67) with a diameter of 1.2 mm was used as a melting electrode. Welding was carried out in modes that provide the optimal effective arc power and heat input, while ICB 150-180A, Ug 28-32B, V mouthpiece 15 mm.

The radius of bending of the melting electrode was adjusted by changing the ratio of the diameters of the bending and looping of their rollers and the force of pressing the pressure rollers. The meeting angle of the electrode with the groove walls and the oscillation frequency of the electrode were controlled by changing the angle and oscillation frequency of the loop-forming panel. The quality of welded joints was assessed by X-ray transmission and metallographic studies.

cross 4.5 mm / s, electrode offset from

The results of welding are presented in the table.

The invention makes it possible to improve the quality of welded joints by eliminating interlayer penetrations and non-fusions with the groove walls.

Claims (1)

The invention of the method of welding with a melting electrode into a slit groove, consisting in deforming the electrode before entering the burner and giving it powerful oscillations at the exit from the burner, characterized in that, in order to improve the quality of welding by adjusting the depth of melting of the edges being welded, the radius bending R melting electrode during deformation is chosen according to the Formula R 0,5l-1 // G, where b is the width of the slot cutting, mm; 1 - the amount of departure of the electrode from the burner, mm, the angle of the electrode with the edges of the cut is chosen in the range of 15-28 °, and the oscillation frequency of the electrode is chosen according to the Formula f d, 5-5,0) Vt, e / b,  Vcg - welding speed, mm / s. A- A 2