Features of structure formation when surfacing steel (iron) on titanium with plasma sprayed coatings in the technology of obtaining butt joint of bimetallic plates "titanium – steel"

The object of this study is structural formation during the surfacing steel (iron) on titanium with plasma-sprayed coatings to obtain a butt connection titanium-steel bimetallic plates. task be solved was devise technology for applying barrier layer between and defect-free joint edges sheets carbon steel, clad titanium, under conditions arc or plasma titanium. application carried out by spraying wire iron powder. In case, coating thickness 150...750 μm applied Grade2 which 1–2 mm thick layers materials similar sprayed ones were deposited deposition. It established that subsequent powder, main technological factors eliminating cracks in resulting compound are amount linear energy. selected (at least 400...600 microns) followed ER70S-6 diameter 1.0 CNPC-Fe200 powder unit energy up ~200...250 J/mm. A transition from obtained. continuous 50–60 microns, consisting intermetalides FeTi FeTi2, as well β-phase an enhanced content, retains certain ductility without other defects. With help devised approach connecting edges, it planned manufacture seam pipes pipelines transport oil gas raw extracted wells.