Advanced welding and cladding methods using auxiliary cold and hot wires

Abstract

The paper presents the features of various fusion welding and cladding methods using auxiliary cold and hot wires in order to increase productivity and improve the quality of welded joints and deposited layers. The introduction lists the various methods of welding that use an additional wire is heated as well as cold. The section “Theoretical and experimental results” presents a method for calculating heat input into a base metal using a heated filler wire and shows the dependence of heat input on its relative amount. The effect of different amounts of filler wire on the shape and size of the welds is shown. A comparative assessment of the effectiveness of using various schemes for introducing an additional heated filler wire into the weld pool was made. The article discusses the use of standard equipment for welding with an additional inverter source for heating filler wire. The influence of automation of the TIG process with cold and hot wire on the lateral shrinkage of 0.8%C-15%Cr-5%Ni-2%Cu-1%Ti-0.7%Si heat resistant steel was studied. The optimal heating conditions were determined to reduce the concentration of Fe in the third layer of deposited metal in the nodes operating in the underwater production of hydrocarbons. The findings present the results achieved in the course of this study, as well as its theoretical and practical significance. The general patterns of the use of arc-free heating of the wire, including in the extended overhang of the electrode, are revealed. Methods have been developed for calculating the heating modes of additional filler wires of various diameters and chemical compositions.