The features of bimetallic pipes and rods fabrication by explosive welding with the subsequent hot deformation
The research is devoted to fabrication of bimetallic pipes and cores by explosive welding and the subsequent hot deformation. The explosive welding made it possible to obtain continuous cylindrical double-layer billets with a combination of layers of steel 20 + 08Cr18Ni10Тi with almost 100 % continuity of adhesion of layers without surface defects and with a given residual deformation in diameter. It was determined that the composition of the atmosphere in the welding gap (at given welding modes and lengths of billets) does not lead to a reduction or elimination of defects in the welding zone. The subsequent hot plastic deformation did not affect the ratio of the component thicknesses of the layers. Based on the results obtained, a combined technology of manufacturing bimetallic pipes and rods with a combination of layers of steel 20 + 08Cr18Ni10Тi was developed and tested, which allows to obtain pipes and rods with corrosion-resistant coating and dimensions that are included in the range of industrially used pipes in the energy industry.