Abstract
This paper considers a possibility to obtain high-quality butt junctions of bimetallic sheets from steel clad with a layer of titanium, with the use of barrier layers. The task that was tackled related to preventing the formation of Ti-Fe intermetallic phases (IMPs) between the steel and titanium layer. The barrier layers (height ~0.5 mm) of vanadium and copper alloys were surfaced by arc techniques while minimizing the level of thermal influence on the base metal. To this end, plasma surfacing with a current-driving wire and pulsed MAG surfacing were used. The obtained samples were examined by methods of metallography, X-ray spectral microanalysis, durometric analysis. It has been established that when a layer of vanadium is plated on the surface of titanium, a defect-free structure of variable composition (53.87–65.67) wt % Ti with (33.93–45.54) wt % V is formed without IMPs. The subsequent surfacing of steel on a layer of vanadium leads to the formation of eutectics (hardness up to 5,523 MPa) in the fusion zone, as well as to the evolution of cracks. To prevent the formation of IMPs, a layer of bronze CuBe2 was deposited on the surface of vanadium. The formed layer contributed to the formation of a grid of hot cracks. In the titanium-vanadium-copper transition zones (0.1–0.2 mm wide), a fragile phase was observed. To eliminate this drawback, the bronze CuBe2 was replaced with bronze CuSi3Mn1; a defect-free junction was obtained. When using a barrier layer with CuSi3Mn1, a defect-free junction was obtained (10–30 % Ti; 18–50 % Fe; 5–25 % Cu). The study reported here makes it possible to recommend CuSi3Mn1 as a barrier layer for welding bimetallic sheets "steel-titanium". One of the applications of the research results could be welding of longitudinally welded pipes of main oil and gas pipelines formed from bimetallic sheets of steel clad with titanium.
Highlights
Clad bimetals are used in the manufacture of various articles in the modern industry [1]
A steel layer is often used in such metals in order to achieve structural strength, and a titanium layer is applied for corrosion resistance
Bimetallic sheets of the steel-titanium class are obtained by hot rolling or cladding by explosion [2]
Summary
Clad bimetals are used in the manufacture of various articles in the modern industry [1]. A steel layer is often used in such metals in order to achieve structural strength, and a titanium layer is applied for corrosion resistance. Bimetallic sheets of the steel-titanium class are obtained by hot rolling or cladding by explosion [2]. 5/12 ( 113 ) 2021 is a task of manufacturing welded pipes from these sheets for main oil and gas pipelines [3]. The presence of titanium and steel layers in combination with the requirements for the strength and corrosion resistance of welded junctions predetermines a series of issues. It is a relevant task to devise manufacturing techniques for welding sheets of titanium-clad steel, which, at relatively low costs, would make it possible to obtain structures of the required quality
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