SOME ASPECTS OF ELECTRON-BEAM WELDED AND LASER WELDED FERRITIC FE-22CR-3MO-5NI-0.3RU ALLOY

Ferritic Fe-22Cr-3Mo-5Ni-0.3Ru alloy was welded by electron beam (EB) and laser techniques. Tensile tests, impact tests, oxalic acid etch, e lectrochemical potentiokinetic reactivation (EPR) and potential-time m easurements were employed to investigate the mechanical properties, mi crostructural features and corrosion behaviour of the EB and laser wel ded metals. The oxalic acid etch tests revealed that the microstructur e of the EB and laser welded metals consisted of columnar grains and c ells, respectively. These structures were formed directly from the sub strate by epitaxial solidification. Furthermore, the oxalic acid tests also showed that the EB and laser welded metals were immune to interg ranular corrosion. Similar results were obtained by double loop EPR te sts.