Relieving welding stresses in cistern-type metal structures by low-temperature annealing

Autor: I. I. Vasilenko, A. I. Zyubrik, N. N. Zhagalyak, G. V. Karpenko
Rok vydání: 1972
Předmět:
Zdroj: Soviet Materials Science. 6:101-103
ISSN: 1573-885X
0038-5565
DOI: 10.1007/bf00721282
Popis: Residual s t r e s s e s produced in and near welded joints , which often reach the yield point of a given metal , produce dis tor t ion of welded s t ruc tu res , and reduce thei r longt ime s t rength espec ia l ly under" the influence of c o r r o s i v e media which lead to s t r e s s c o r r o s i o n cracking. One of the mos t widely used and re l i ab le methods of re l iev ing these s t r e s s e s is heat t r ea tmen t of welded par ts . Welded low-carbon s tee ls a re usual ly s t r e s s re l i eved at 650-700 ~ C. In view of diff icult ies in const ruct ing the heating equipment for heat t rea t ing la rge s t ruc tu res (e. g., decomposers used in the production of a luminum which a re 7 -9 m in d iamete r and 27-30 m high), s t ruc tu res of this kind a re not s t r e s s re l ieved . In this case the welds and heat -af fec ted zones a re local ly heat t rea ted with the aid of g a s / a i r torches , induction and radiant hea t e r s , etc. However , local heat t r ea tment is not always sa t i s fac tory s ince it may lead to the appearance of new internal s t r e s s e s during cooling due to steep t empe ra tu r e gradients between the heated and cold meta l zones.
Databáze: OpenAIRE
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