Butt welding

Butt welding This is a type of resistance welding that uses heat and pressure to connect the surfaces being joined. The thermal effect of an electric current greatly heats the metal surface, causing the surfaces to be pressed together to form a strong bond at the interatomic level. This welding method emerged over 100 years ago. A specific example of this type of connection is capacitor-butt welding. Butt welding It is used in pipelines, in repair work where it is necessary to weld threaded pipes to a drill pipe, etc.

Butt welding technology

Butt welding technology  involves intense heating of the surface to be welded and mechanical action on the part to achieve a welded joint. The requirements are butt welding technology  was successful, includes:

• Careful preparation of the metal surface ends. They must be fitted as evenly as possible. This will ensure a strong joint. Removing surface contaminants and oxides also improves the quality of the weld. This is especially important when the surface area is 200 square millimeters;
• fixing the parts to be welded in the welding machine, setting their alignment;
• passing a high-frequency electric current, which heats and melts the surfaces being joined;
• mechanical compression of workpieces, which results in plastic deformation, destruction of remaining oxides and atomic bonding of two surfaces;
• the process of crystallization and formation of the crystal lattice of the welded joint.

Such butt welding technology  It allows you to connect parts for different purposes. The quality of the connection ensures long-lasting service life.

Butt welding methods

On butt welding methods  influence:

• grade of metal being welded, its composition;
• what is the cross-sectional area at the metal junction;
• What are the requirements for the quality of a welded joint?

The first method is resistance welding.

It is used to join components with a cross-sectional area of up to 200 square millimeters. For this, the components are securely clamped in special clamps of the welding machine. The surfaces to be welded are pressed tightly together. An electric current of 1,000–10,000 A is then passed through the component. The heating temperature at the ends of the component is below the melting point of the metal. After heating, the components are compressed while the current is turned off. Resistance welding is used to join small-section low-carbon steel rods and pipes, as well as wire.

The second method is fusion welding.

The welding process of this method is similar to the first method. However, with this method, current is applied first, followed by joining the parts. Only one of the parts is moved at a slow speed. The average melting temperature increases gradually, achieving a uniform layer of molten metal. This method can be continuous or intermittent. The cross-section of the joined workpiece can reach 100,000 square millimeters. Parts welded this way include wheels, rings, pipes, rails, etc.

Such butt welding methods  allow to expand the range of weldable materials.

Butt welding of metal

Butt welding of metal  It is a practical method for joining railway rails to create a seamless joint. It allows the production of long blanks from steel, non-ferrous metals, and their alloys. Butt welding of metal It is used to manufacture anchor chains, cutting tools, and coils for large refrigeration units. Overall, this welding method has a very wide range of applications.