Study of the influence of structural characteristics and the chemical composition of the filler powder wires on the modes of arc welding

The oil and gas industry is one of the fastest growing. For the production, transportation and storage of oil, gas and petroleum products being introduced various new advanced equipment, characterized by higher reliability and manufacturability.
Materials and methods
Flux-cored wire welding.
Results
Studies have shown that the change of welding current is significantly influenced by the complex influence of such factors as the features of a powder wire and chemical composition the powder core.
Сonclusions
1. Welding arc, burning mainly between the shell and the surface of the product, and active spot moves erratically on the cross section of the shell, with a constantly changing speed. 2. Core flux-cored wire has considerable resistance, which depends not only on the design and chemical composition the powder core. 3. The chemical composition of the core of powder wire leads to essential changes in the modes of welding (with a diameter of 2 mm and the shell thickness 0,2 mm amperage varies from 200–340 A). 4. Shell thickness of a wire also has a significant influence on change of size of a current strength (when the wire diameter is 2.4 mm rutile type core, amperage changes in the range of 280–500 A). 5. On the basis of analysis of experimental data and conducted by mathematical calculations, defined change in the welding current, depending on the design features and chemical composition of cored wire. To indicate this dependence the author of the article prompted to enter a dimensionless coefficient (look at table 3 and fig. 11–15), which takes into account the change in the value of welding current from the chemical composition of the powder core and design features of the wire.