Influence of the parameters of the sintered surfacing tape on the structure and properties of the weld metal and the zone of thermal influence
The article discusses the lack of methods of calculation of modes of automatic welding under the flux layer sintered tape, taking into account its characteristics and technological parameters influencing the formation of weld metal. The problem is that the process of surfacing, in accordance with the applicable standard ST CKBA 053-08 provides only for manual arc surfacing with coated electrodes of ELZ-НВ1. The process of manual arc welding electrodes of ELZ-НВ1 provides for the cladding of each subsequent coat after the previous cooling to a temperature of ≤50 °C outdoors. Given the low deposition rates and the need for subsequent heat treatment (load in the furnace at a temperature of from 20°C to 500°C, heating to a temperature of 800-820°C, exposure for 4-6 hours and air cooling). On August 1, 2014, amendments were made to the standard ST CKBA 053-08. In accordance with the changes for surfacing of sealing surfaces with the chemical composition of the type 09Х31Н8АМ2, it is proposed to use a method of automatic welding under flux with application of welding wire of SV-04Х19Н11М3 and flux ELZ-FKN-Х32Н8. Thus, the graphical dependencies presented in the article indicate that the magnitude of the welding current exerts the greatest influence on the depth of penetration, whereas the dependence on the voltage and the welding speed is insignificant. In accordance with the noted regularity, as the voltage increases, an increase in penetration occurs, but in the case of a surfacing rate, an inverse relationship is observed. The models developed by the authors are adequate, the error in determining the width of the roller does not exceed 6.2%, the depth of penetration is 5.6%.