Preliminary chemical treatment affecting the quality of solid-state welded joints of wires in porous mesh materials manufacture

Abstract

Porous mesh materials with an organized structure, stable and reproducible properties are used in the manufacture of filter elements, thermal protection systems, rocket and turbojet engines, and other products with a given set of properties. The interlayer strength of such materials is significantly affected both by the modes of plastic deformation and welding and by the technology of preliminary chemical cleaning of the wire mesh surface. Etching work-pieces in a mixture of inorganic acids and organophosphorus complexones reduces the thickness of oxide films and additionally activates the contact surfaces in the welded joint. The study introduces the etchant solutions for treating VT1-0 titanium and corrosion-resistant 12Kh18N10T steel wires. The solutions increase the strength of the welded joints made by vacuum rolling welding and diffusion welding, compared with similar processes without pretreatment. The study also specifies the modes of technological processes of chemical etching and diffusion welding of 12Kh18N10T steel meshes, which provide maximum interlayer strength.