Powder wire. Application

The welding powder wire is a metal shell, which is made of a steel strip with a thickness of 0.2 to 0.5 millimeters. The shell is filled with slag- and gas-forming components.

Welding with cored wire is used in shielding gases or for mechanized arc welding with an open arc. Having saved technological advantages of a standard wire, it creates slag and gas protection from atmospheric air. This is especially important when working in open areas. Powder wire provides refining and alloying of the seam. When using it, it is allowed to use a current having a density of 150-170 A / mm2. For manual arc welding with open electrodes, the current has a density of not more than 20 A / mm2. The flux-cored wire, thus, makes it possible to increase the efficiency of the process one and a half to two times.

There are various brands of continuous electrodes. So, for example, when cold welding of cast iron, PP-C1 grade material is used, for PP-C3 hot material.

It should be noted that the technological process of metal joining by means of electrodes is one of the main methods for solving various problems of scientific and technical progress. This process is used practically in all spheres of the national economy. Powder wire is considered a very promising material. Its application increases not only the productivity, but also the quality of the work performed.

It is used to expand the range of welded steels. Its application is necessary especially in cases where doped monolithic wire for certain types of steel can not be produced metallurgically.

The flux-cored wire is classified according to the method of protection used, for the main purpose, for the type of core, for mechanical properties, and for welding in a different position.

Most of today's products are used for welding low-alloy and low-carbon structural steels. Powder wire is produced for special and general purpose. The first category includes the material used in the work with forced seam formation.

Of particular importance is the classification of the material by the properties of the seam and the welding joint. This indicator allows you to determine the suitability of a product for a welding job for a given design, if it has already defined the minimum requirements for the mechanical properties of materials. Verification of compliance with the requirements is carried out by identifying the minimum required indicators of temporary resistance to rupture, as well as the impact strength of the suture metal. Evaluation is given by testing standard samples. To determine the type of wire for the guaranteed temporary resistance to breaking, a tensile strength is established. When classifying a cored wire, it is customary to indicate the type of product, the strength of the material and the permissible positions (spatial) welding.