Abstract
This manuscript presents the results from an experimental investigation performed to study the material and mechanical properties of two weld joints manufactured within close proximity. The experiment has been designed using seven welded S420G2 + M 500 × 300 × 15 mm structural steel plates, with varying distances between two parallel adjacent weld toes at 44, 12 and 1.3 mm. All these distances were less than the distance that has normally been recommended in standards, codes and specifications. A common requirement is four times the plate thickness, which in this experiment is 60 mm for a 15-mm-thick plate. The scope of the study was to analyze the effect the variation of distance had on the mechanical and material properties. A welding procedure specification was created and approved for the manufacturing of the weld joints. All subsequent welds were based on this welding procedure specification, in order to maintain conformance and uniformity. The non-destructive and destructive testing included: visual testing, radiographic examination, bending testing, Vickers hardness testing, Charpy V impact testing, tensile testing, as well as macro and microscopic examination. The results from the testing showed no adverse effects on the mechanical properties in the initial weld joint. This includes a complete heat-affected zone overlap in the specimen with 1.3 mm between the weld toes. These findings challenge the notion that the minimum distance requirements are based on metallurgical reasons. The outcome of this specific experimental setup can provide a baseline for performing further investigations.
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Acknowledgements
This work was part of a master thesis project at the University of Stavanger. Welding Engineer Arild Finnesand, KIWA TI in Stavanger, has been very helpful throughout the project. He has supported us with the welding of the steel plates as well as providing us with theoretical and technical knowledge. Metallurgist Petter Lunde, Qlab in Stavanger, helped us out with the machining and testing of all specimens.
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Larsson, M., Larsson, M., Ratnayake, R.M.C. (2021). Experimental Investigation of Weld Joints Manufactured at Close Proximity in S420 Structural Steel. In: Abdel Wahab, M. (eds) Proceedings of 1st International Conference on Structural Damage Modelling and Assessment. Lecture Notes in Civil Engineering, vol 110. Springer, Singapore. https://doi.org/10.1007/978-981-15-9121-1_25
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DOI: https://doi.org/10.1007/978-981-15-9121-1_25
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