SU1682089A1 - Method of electron-beam welding - Google Patents

Abstract

This invention relates to electron beam welding technology. The purpose of the invention is to improve the quality of welded joints by improving weld formation and reducing power consumption during welding. Weld joints 1 and 2 are located one below the other in a vertical plane. The edges of the upper joint 1 are assembled for welding with a gap whose size is less than the diameter of the electron beam 3. A part of the electron beam forms a weld at the upper joint, and a part of beam 4, passing through the gap in the upper joint, forms a welded joint of the lower joint. The welding mode is selected from the condition of through melting of the upper joint and simultaneous welding of both joints. 2 ill., 1 tab.

Description

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This invention relates to electron beam welding technology.

The purpose of the invention is to improve the quality of welded joints by improving weld formation and reducing energy consumption during welding.

FIG. 1 shows a scheme for carrying out the method; in fig. 2 - dependence of energy consumption during welding on the size of the gap in the upper joint,

Weldable joints 1 and 2 are located one below the other in a vertical plane. The edges of the upper joint 1 are installed with a gap smaller than the diameter of the electron beam 3. When welding, part of the electron beam 3 forms the seam of the upper joint 1, and the other part 4 of the beam 3, passing through the gap, forms the seam of the lower joint 2. The welding mode is chosen from the condition of through penetration of the upper joint,

The method is implemented in electron-beam welding of closed hollow structures made of titanium alloy VTZ-1. The thickness of the edges of the upper joint 10 mm, and the bottom 8 mm. The distance between the joints 15 .., 30 mm. Welding was performed on an ELU-95 installation with a CEP-2M-1 gun in the mode: Accelerating voltage, kV27 Welding speed, m / s 0.0083 Residual pressure, mm Hg, (5 ..; 8) -10 The focus of the beam was placed on the surface of the lower joint. Ray current changed from conditions 1-5

In the view of simultaneous penetration of both joints, the dependence of the beam current on the size of the gap in the upper joint is shown in FIG. 2. In structures with a gap in the upper

At the junction up to 0.2 mm, the upper seam is formed with periodically repeating sections of protuberances and concavities. Comparative data of convexities and concavities of the seam on the size of the gap in the upper joint are given in the table.

When using the method, the amount of the liquid phase and the scattering of the electron beam are reduced, which makes it possible to stabilize the formation of seams. Formed by

15 Bole smooth transitions from the seam to the base metal. The concavity of the seams is eliminated by the introduction of technological shoulders into the design.

The use of the method makes it possible to increase the quality of the formation of welds by 20 while reducing the energy consumption during welding by 25-30%.

The formula of the invention The method of electron beam welding with one modern penetration of two joints located one below the other in a vertical plane, characterized in that, in order to improve the quality of welded joints by improving the formation of welds and reducing power consumption during welding, the edges of the upper joint are set with a gap smaller than the beam diameter, and the welding mode is chosen from the condition of penetration of both joints.

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Claims (1)

Claim A method of electron beam welding with simultaneous fusion of two joints located one below the other in a vertical plane, characterized in that, in order to improve the quality of welded joints by improving the formation of welds and reducing energy consumption during welding, the edges of the upper joint are installed with a gap smaller than the diameter beam, and the welding mode is selected from the condition of penetration of both joints. ί The size of the upper gap j joint mm ..... ’Ί Upper seam Bottom seam bulge of a seam, mm concavity of the seam, mm convexity of the seam root, mm bulge of a seam, mm concavity of the seam, mm bulge of the seam root, mm Up to 0.2 Up to 0,5 Up to 0.4 2.4 ... 2.9 Up to 0.7 Up to 1.1 0 ... 3.1 0.4-0.6 0.9-1.2 - 0.5 ... 0.7 1.7 ... 1.9 Up to 0.1 Up to 0,5 1.4 ... 1.7 I 1.4 ... 2.1 - 0.8 ... 0.9 1.4 ... 1.5 - Up to 0.2 0.9 ... 1.0 L