SU1632694A1 - Method of flash-butt welding - Google Patents

Abstract

The invention relates to welding and can be used in the development of the technology of contact butt welding with obtaining an inclined zone of the welded joint. The purpose of the invention is to simplify the welding technology. The technological linings 1 are installed before welding on the surface of the welded parts 2 through insulating gaskets 3, then clamped in the current-carrying clamps 4 of the welding machine. Moreover, the distance between the technological linings and the ends of the parts is half the tolerance for reflow. Then, welding is performed according to a predetermined program. As a result, the joint is formed under the conditions of volumetric compression with the formation of an inclined zone of the welded joint, and welding is performed on commercially available universal machines without the use of specialized equipment. 2 Il.

Description

1

The invention relates to the field of welding and can be used in the development of the technology of contact butt welding with obtaining an inclined zone of the welded joint.

The purpose of the invention is to simplify the welding technology,

The essence of the method of flash butt welding is that, before welding, on the side surface of the parts from opposite sides of the section being welded, two heat-insulated technological linings from the parts are installed, and the distance between the ends of the part and the technological overlay is equal to half the reflow pass.

FIG. 1 shows a diagram of a flash butt welding method, the position of parts before welding; figure 2 - the same, after welding.

Technological linings 1 are installed on the parts to be welded x 2 through thermal insulating gaskets 3. In the diagram, the current-carrying clamps 4 of the welding machine are marked. A is the distance between the ends of the part 2 and the technological lining 1.

The flash butt welding method is as follows.

Two technological linings 1 are installed before welding on the surface of the parts to be welded 2 on opposite sides of the section to be welded through insulating gaskets 3 at a distance Dot of the ends of the parts equal to half of the reflow allowance. Parts with overlays are clamped in the current-carrying clamps 4 of the welding machine and are welded according to a predetermined program.

Experimental verification of the method was carried out when welding plates with a cross section of 100x10 mm from 18G2AF steel on a K-617 machine.

Welding was performed in the following mode: secondary voltage 6.8 V, initial reflow rate V0 0.25 mm / s, final reflow rate

VK 1.5 mm / s, allowance for reflow 10pl 2.8 mm, allowance for draft of foe 7 mm.

Technological linings were installed on the surface of the parts to be welded from different sides of the welded section at a distance of A 0pl / 2 14 mm from the ends. Paronite with a thickness of 1 mm was used as a thermal insulation strip. The welded parts with the plates were clamped in the current-carrying clamps of the welding machine, and welding was carried out according to a predetermined program.

After welding, measurements were made of the angle of inclination of the joint zone and mechanical tests of the welds. The angle of inclination to the plane of the cross section of the parts was about 26 °, the impact strength of 35-61 J / cm2,

Metallographic studies showed the absence of any defects in the joint area.

The proposed welding method makes it possible to use commercially available universal butt welding machines to obtain a joint with an inclined location of the welded joint zone with a high level of mechanical properties of the metal without using specialized equipment, which greatly simplifies the technology for performing the work. In addition, the metal structure is improved, since the formation of the compound takes place under conditions of bulk compression.

Claims (1)

The invention of the method of flash butt welding by flashing and slumping of parts with a specified allowance to obtain an inclined welded joint, characterized in that, in order to simplify the technology, before welding on the side surface of the parts from opposite sides of the welded section, two heat-insulated lining, and the distance between the ends of the parts and the ends of the technological linings set equal to half the allowance for fusion. QtaaZ