Determination of clad plates residual stresses by x-ray diffraction method

Istraživan je utjecaj postupka platiranja na veličinu i narav zaostalih naprezanja platiranih limova. Rabljena su tri postupka platiranja: toplo valjanje, elektrolučno navarivanje pod praškom (EPP) s elektrodnim trakama u dva sloja, te platiranje eksplozijom. Izložen je prikaz teorijskih osnova mjerenja naprezanja difrakcijom x-zraka s posebnim naglaskom na problem sklonosti pukotinama ispod navara. Kod svih primijenjenih postupaka platiranja, uporaba toplinske obradbe žarenjem dovela je do pada vrijednosti zaostalih naprezanja. No pretvorba tlačnih naprezanja u vlačna kod nekih slučajeva je vrlo nepovoljna sa stajališta sklonosti korozijski postojanog platirajućeg čelika napetosnoj koroziji kao i pukotinama pod navarom.The paper elaborates the influence that clad procedure has on the level and nature of residual stresses in clad plates. There are three clad procedures applied, as follows: hot rolling, submerged arc welding (SAW) with strip electrode in two layers and explosion welding. Theoretical basics on residual stresses measured by x-ray diffraction are reviewed in the paper, with special emphasis put on problems of underclad cracking tendency. In all applied cladding procedures, usage of heat treatment by anealing resulted in the decrease of residual stresses values. However, transformation of commpresed stresses into tensile stresses in some cases was very unfavourable, if referring to the tendency of plating corrosion resistant steel to stress corrosion and to underclad cracking