Technique of definition of welding current when connecting joints of trunk pipelines using flux-cored wires

Lack of methodology selection of the most rational modes of welding flux-cored wires, leads to a substantial increase in the cost of introducing new samples of these materials in the technological process of welding works on trunk pipelines.
Materials and methods
Flux-cored wire welding.
Results
Carried out researches allowed to get a working formula to determine the welding current for arc welding of trunk pipelines using flux cored wires.
Сonclusions
1. The experiments showed that a significant effect to change welding current in welding flux-cored wires has a complex changing of such factors as: geometrical parameters of wire and the chemical composition particulate filler. 2. Analysis of nomograms constructed on the basis of mathematical processing of the experimental data showed that the required mathematical model takes the form of a polynomial of degree 4. It confirms the hypothesis that geometric parameters of the combined action of wire and the chemical composition particulate filler to change welding current. 3. Obtained expressions allows to accurately determine the value of welding current in welding joints of the sections of pipelines using flux cored wires, which significantly reduces the time and cost of material and technical resources for the definition of the desired parameter.