Abstract
The structure and mechanical properties of pipe welded joint made of heat-resistant austenitic alloy based on the Fe —25Cr—35Ni system are studied by optical and electron microscopy and X-ray spectral microanalysis. Signifi cant structural inhomogeneity in various zones of the welded joint and the formation of intermetallic G-phase in the heat-affected zone and weld metal are revealed. It is shown that the changing in the alloy structure during welding leads to signifi cant decrease in the mechanical properties of the welded joint.
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