Mechanical investigations of astm a36 welded steels with stainless steel cladding

Pavaret Preedawiphat, Numpon Mahayotsanun*, Keerati Sa-ngoen, Mai Noipitak, Pongsak Tuengsook, Sedthawatt Sucharitpwatskul, Kuniaki Dohda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The in-service life of ASTM A36 welded steel pipes in power plants is often shortened by ash corrosion. During the heating condition, the ash deposition on the welded steel pipes gradually reduces the thickness of the pipes, thus, reducing the lifetime. Instead of replacing the pipes with new ones, the cost could be significantly reduced if the lifetime could be further extended. Weld cladding was the method selected in this study to temporarily extend the service life of welded pipes. This paper performed the mechanical investigations of A36-A36 welded steel plates after coating the surfaces with 309L stainless steel with a cladding method. The residual stress was also tested to observe the internal stresses developed during the welding processes of A36-A36 specimens. The comparison between the coated and non-coated surfaces of welded steels was performed by using the tensile tests (at room and elevated temperatures), corrosion (pitting corrosion, intergranular corrosion, and weight-loss corrosion) tests, and wear (shot blasting) tests. The life-extension of both coatings was evaluated based on the tensile tests and the corrosion and wear tests provided the qualitative evaluations of the coating performance. The results showed that surfaces coated by cladding could be used to temporarily extend the life of ASTM A36 welded steel under the studied conditions.

Original languageEnglish (US)
Article number844
JournalCoatings
Volume10
Issue number9
DOIs
StatePublished - Sep 2020

Keywords

  • Astm a36
  • Cladding
  • Corrosion
  • Shot blasting
  • Stainless steel
  • Wear
  • Welding

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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