SU1409431A1 - Method of flash butt resistance welding - Google Patents

Abstract

The invention relates to a flash butt welding method of predominantly multilayer parts and can be applied in any industry in the manufacture of structural assemblies. The purpose of the invention is to expand the technological capabilities of the method due to the welding of multilayer parts. The outer and inner surface layers of the parts to be welded are additionally heated to a predetermined temperature simultaneously before or during the melting process. The width of the heating zone of the layers is set 1.5-2.0 times the heating zone of the same layers in the same mode of melting without additional heating. In particular, the layers are heated by high frequency currents. Due to the additional heating, the radial deformation of the layers is reduced by increasing the 1 pyrins of the deformation zone. The application of the invention improves the quality, in particular, the fochno of the welded joint. 1 h. apt. a (c

Description

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1409431

The invention relates to a flash butt welding method for predominantly multi-layered parts and can be applied in any industry in the manufacture of structural units.

The aim of the invention is to expand the technological capabilities of the method due to the welding of multilayer parts.

The method is carried out as follows.

I The parts to be welded are prepared. The prepared parts are installed in a welding machine. The outer and inner surface layers of the clamped parts are additionally heated to a predetermined temperature at the same time or during the melting process, with the width of the heating zone of the layers being set 1.5–2.0 times larger than the heat waves of the same layers in the same finishing mode. heating. 3 particular layers are heated by high frequency currents. The welded ends of the heated parts are melted. Melted parts osa: nod. At the upset part, the burr is taken outside and inside.

When increasing the heating zone of the outer || Internal surface layers welded to ilibix multilayer parts due to additional heating reduce radial | 1 deformation of the layers by increasing the width of the deformation zone. When removing burr (protect the cross-sectional area, and hence the strength of the welded joint.

I If the width of the heating zone is less than 1 |, 5 times the heating zone of the same layers || and in the same melting mode without additional fJHTcvibHoro heating, then the values of the radial deformation of the layers during the draft increase. With deburring, the area of the cross-section decreases, and hence the strength of the welded joint is reduced.

If the heating zone width is more than 2.0 times the heating zone of the same layers in the same heating mode without additional heating, then the radial value

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The deformation during settling is practically unchanged. When removing burrs, the cross-sectional area and, consequently, the strength of the welded joint does not change. This reduces the efficiency of the welding process due to the increased energy consumption.

Example. Contact butt welding by melting sections of multilayer pipes with an outer diameter of 1420 mm, a length of 1500 mm, the wall of which consisted of five words 4 mm thick, was performed as follows. Weld sections were prepared. The prepared sections were installed in the clamps of the welding mask K 700 with a gap between the welded ends of 1 mm. An inductor was installed on the ends to be welded and the ends of the HDTV were heated. Heating modes: 500 kW capacity, duration 30 s, temperature 1000-1050 ° C, heating zone width 40 mm (when reflowed in the same mode without induction heating, equal to 20 mm). The inductor was displaced away from the junction. The welded ends of the heated sections were melted and the melted sections were upset. The graded sections were filmed outside and inside.

The application of the invention improves the quality and strength of the welded joint.

Claims (2)

1. A flash butt welding method of predominantly multilayer parts, in which the parts to be welded are additionally heated to a predetermined temperature prior to or during the reflow process, characterized in that, in order to expand the technological capabilities of the method by welding multilayered parts, the outer and inner surface parts are heated simultaneously layers, and the width of the heating zone of the layers is set 1.5-2.0 times the heating zone of the same layers in the same fusion mode without additional heating. 2. A method according to claim 1, characterized in that the outer and inner surface layers are heated with high frequency currents.