SU835678A1 - Method of producing welded constructions - Google Patents

Description

(54) METHOD OF MANUFACTURING WELDED DESIGNS of thin-sheet structures from high-strength alloyed steels and titanium alloys. For this, arc welding is performed on both sides of the joint with a non-consumable electrode to a depth of 10-20% of the thickness of the welded blanks, and the subsequent resistance seam welding is performed between these seams with their overlapping. Figure 1 shows the implementation of the proposed method; figure 2 - the resulting welded joint; on fig.Z - welded joint clad sheets. The technology of the proposed method is as follows. Edges of welded sheets are assembled end-to-end. The fusion welds are pretreated on both sides by fusion welding, for example, a non-melt alloy with a tungsten electrode, to a depth of 10-20% of the thickness of the sheets being welded. At the same time, due to the auto-pressing effect, the edges are compressed until the gap disappears completely. The joint can be penetrated to a depth of 1020% in any spatial position. In a wide range of penetration modes within the specified limits (10-20%) of high-strength steels and titanium alloys it crystallizes without reinforcement in the face with the surface of the sheets to be welded and therefore does not require additional stripping. Then, the contact seam is performed by roller welding of the middle part of the joint in such a way that the roller butt weld overlaps the previously made seams by at least 5% of the sheet thickness. Edge welding with fusion and seam roller butt welding can be carried out simultaneously, with the displacement of the electrodes of the fusion welding process in the direction of the welding direction by an amount greater than the welding machine roller diameter. A welded joint, made in this way, ensures equal strength with the base metal, eliminates angular deformations, greatly simplifies the protection of the weld zone from oxidation when welding active metals, eliminating the need to use a filler metal. Roller welding does not require tooling for fixing sheets; this is the role of joint areas processed by fusion welding. The technological process was tested on sheets of titanium alloys VT6S, VT-20, VT-5, high-strength steels VNS-2, EP817 stainless steel 1X18H10T, steel 20 with a thickness of 3; 5; 8; 10 mm. Automatic argon arc welding was carried out on a welding stand with keyboard clamps. Welding mode: 3 80-120 A, welding speed m / h. Roller welding was carried out on machines MShSHI-400-1, MShSHI-600, The table shows the test results.

current,

500

ki,

0.2

s,

0.1

3.0 3.0-4.0 5

Welded joints showed high-when the metal of the cladding and the main weeping performance, tal does not differ significantly in their

the proposed method may be. ax-thermophysical properties (for example,

welding of clad metal, 65p melting temperature) more

5-8

1-3

thirty

1500 2500

800

0.25 0.3-0.4 .0.5

0.1 0.2

0.2

than 20%. In this case, the outer layer of the plating is welded when the edges are processed by arton-arc fusion welding, and the middle layer of the base metal is roller welding.

Thus, the clad metal retains its original chemical composition and its specific properties,

Claims (3)

1. Konov N. N. Mashiyy for resistance electric welding. L., Gosenergoizdat, 1954, pp.355-405. 2. Welding Reference. Ed. A. Akulov. M., Mashinostroenie, 1971, p.184. , five 3. Authors certificate of the USSR 470376, cl. 23 K 11/08, 1973. (prototype).