Influence of Plate Geometry on the Welding Residual Stresses from Submerged Arc Welding in Offshore Steel Structures

Michael Joachim Andreassen

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

In the offshore wind industry, welding-induced distortion and tensile residual stresses have become a major concern in relation to the structural integrity of a welded structure. Particularly, the continuous increase in size of welded plates and joints needs special attention concerning welding induced residual stresses. These stresses have a negative impact on the integrity of the welded joint as they promote distortion, reduce fatigue life, and contribute to the stress corrosion cracking and brittle fracture in the weld components.
This paper deals with the influence of plate thickness and plate geometry on the welding induced residual stresses from submerged arc welding. It also investigates whether the assumption of residual stresses up to yield strength magnitude is valid in welded structures as stated in the Eurocode 3, DNV and IIW design guidelines.
Submerged arc welding (SAW) is used to make a fully penetrated butt weld in 10 mm, 40 mm, and 50 mm thick steel plates with both circular hollow section and flat plate geometry. The base material is thermomechanically hot-rolled low-carbon fine-grained S355ML steel in accordance with the European standard DS/EN 10025-4.
The welding residual stress state is investigated by means of experiments, and in accordance with existing production procedures to find the magnitude of the residual stresses. Experiments include welding and hole-drilling measurements of
near-surface residual stress distribution.
Original languageEnglish
Publication date2019
Number of pages7
Publication statusPublished - 2019
Event72nd IIW Annual Assembly and International Conference - Bratislava, Slovakia
Duration: 7 Jul 201912 Jul 2019
Conference number: 72

Conference

Conference72nd IIW Annual Assembly and International Conference
Number72
CountrySlovakia
CityBratislava
Period07/07/201912/07/2019

Bibliographical note

Paper ID 132

Keywords

  • Welding Residual Stresses
  • Submerged Arc Welding
  • Offshore Steel Structures
  • Circular Hollow Section

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