The Effect of TiN Nanoparticles on the Structure and Mechanical Properties of the Porous–Solid Steel Joint Formed by Laser-Beam Welding

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Abstract
—The formation of a crystal structure and properties of a welded joint between a porous stainless steel plate and a solid plate of greater thickness with the use of nanomodifying additives has been experimentally investigated. To obtain a high-quality butt joint of the plates, the end layer of the solid plate was found to have been penetrated. The laser beam axis is shifted from the boundary of the plate joint by some distance, which is necessary to compensate the (material of) metal during the melting of the porous plate. The application of nanomodifying additives reduces the grain size of the weld structure, which, in turn, has a positive effect on the mechanical properties of the resulting joint. The results of tensile strength tests have shown that the failure of nanomodified samples, unlike unmodified ones, occurred only in the main porous metal. The average value of the tensile strength is 89.5 MPa.

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