Abstract
Residual stresses in a stainless age-hardenable martensitic austenitic steel in dependence on a various technological treatments i.e. welding by metal-inert-gas (MIG) or electron beam (EB) and postweld heat treatment were investigated using neutron diffraction. A unique high-resolution experimental arrangement for nondestructive strain measurements is reviewed. The resolution of the instrument (Δd/d ≈ 10^-4, d - lattice spacing) enabled us to investigate relatively small elastic strains in weld joints. The advantages of EB welds (higher strength, lower level of residual stresses) are described. The EB welds may be put into service without postweld heat treatment.

Key words
residual stresses, stainless age-hardenable martensitic-austenitic steels

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