SU686839A1 - Method of series arc welding - Google Patents

Description

(54) METHOD OF UNILATERAL ARC WELDING

I

The invention relates to welding, in particular to methods of arc one-way welding.

A known method of one-sided arc welding in which welding is conducted on a conductive lining with a metal powder poured onto it, while the current lead is carried out through the conductive lining 1.

When using this method, the metal powder melts into the metal schva.

The disadvantage of this method is that it lacks the means to ensure protection of the corns against external exposure.

There is a method of one-sided arc welding, in which welding will be conducted on a conductive forming lining with a flux, the melting temperature of which is lower than the melting temperature of the product to be welded, to which the current supply 2 is carried out.

Welding on a fluxedum lining provides both the formation and protection of the root weld.

The disadvantage of the known method is that the current flowing through the product creates a magnetic field that is transverse to the arc current and causes the arc to deviate to the side opposite to the place of the electrical power supply, i.e. a magnetic blast that increases with increasing welding current, which limits welding at high modes and causes the occurrence of poor penetration, undercuts and other defects.

Claims (2)

To improve the quality of welding by eliminating the arc wandering and providing a sliding electrical lead, the length of the forming lining selects the excess length of the product to be welded, and a layer of electrically insulating material is installed on the material layer and the flap from the side of the lining end of the lining at the border with the flux. a layer of metal powder is poured, after which the tokopodo water to the product is realized through the lining and the metal powder and after melting, under the arc In the entire depth of its depth, the flap is raised to the lining to stop the current lead to the product through the metal powder. FIG. 1 is a diagram of a current lead for one-sided arc welding on a flux-copper lining at the time of ignition of the arc; in fig. 2 - current lead scheme at the initial welding time. The method is carried out as follows. Under the product 1, a forming conductive pad 2 is installed, the melting temperature of which is higher than the melting temperature of the flux 3 located on it, for example, the flux AN-348A or SC-45, the melting temperature of which, in turn, is lower than the melting temperature of the welded product 1. Proposed method based on the property of a flux in a cold state, is a dielectric, and at a temperature close to the transition temperature to a liquid state, and also in a molten state, to be a conductor of electric current. To initiate the arc, current is supplied to product 1 and to electrode 4. Current supply to product 1 is carried out through forming lining 2 and metal powder 5, which is partially placed directly on lining 2, and the rest is poured onto electrically insulating material 6, which is placed on lining at the boundary with the flux 3. On the surface of the electrically insulating material b, a valve 7, made of a dielectric material, is rotatably mounted in a vertical plane. At the beginning of welding, after melting the flux 3 under the arc to its full depth to forming lining 2, turning the flap 7 to the vertical position provides isolation of the metal powder 5, located directly on the lining 2, from the powder placed on the electrically insulating material 7 Thus, the current supply to the product I is terminated through the metal powder 5. After that, the current lead to the product 1 is carried out through the molten flux 8. During the welding process, due to the high thermal conductivity of the lining 2, the liquid flux n Directly behind the arc, it solidifies to form schlacic crust and becomes a dielectric. Ahead of the arc, the unmelted flux is also a dielectric. The molten flux 8, which is directly under the arc, is the only point in the electrical power supply to the product. The current lead moves with the electrode 4 and is slidable, and at any time of welding the current lead to the product from the forming conductive pad 2 is located along the axis of the electrode 4, which eliminates the wandering arc and improves the quality of welding. The proposed method makes it possible to create a sliding current lead, which is contactless, i.e., there are no moving and rubbing parts. Claims The method of one-sided arc welding, in which welding is carried out on a conductive deformation lining with a flux, the melting temperature of which is lower than the melting temperature of the product being welded, to which a current supply is carried out, characterized in that in order to improve the quality of welding by eliminating the arc wandering and ensuring a sliding current lead, the length of the forming lining is chosen to be longer than the length of the product to be welded, and from the side of the protruding end of the lining at the border with the flux a layer of ele triple insulation material on which a dielectric valve is installed, a layer of metal powder is poured onto the layer of material and the valve, after which current is supplied to the product through the lining and metal powder and after the melting of the flux under the arc, the valve is raised to its depth to terminate the current lead to the product through the metal powder. Sources of information taken into account in the examination 1. USSR author's certificate number 35932, cl. 23 K 9/00, 1929. 2. Accepted for Japan No. 41-46523, cl. 12 B 112, 1966. ...... parasite ////// 77 ////////////////////////////// A figure 1