Residual stress control of multipass welds using low transformation temperature fillers. Issue 5 (24th March 2018)

• Record Type: Journal Article
• Authors: Moat, R. J.; Ooi, S.; Shirzadi, A. A.; Dai, H.; Mark, A. F.; Bhadeshia, H. K. D. H.; Withers, P. J.
• Is Part Of: Materials science and technology. Volume 34:Issue 5(2018)
• Page Start: 519
• Page End: 528
• Publication Date: 2018-03-24
• Subjects: Martensitic transformation -- gas metal arc welding -- displacive transformation -- low stress low distortion welding; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2017.1410954
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: Low transformation temperature (LTT) weld fillers can be used to replace tensile weld residual stresses with compressive ones and reduce the distortion of single-pass welds in austenitic plates. By contrast, weld fillers in multipass welds experience a number of thermal excursions, meaning that the benefit of the smart LTT fillers may not be realised. Here, neutron diffraction and the contour method are used to measure the residual stress in an eight pass groove weld of a 304 L stainless steel plate using the experimental LTT filler Camalloy 4. Our measurements show that the stress mitigating the effect of Camalloy 4 is indeed diminished during multipass welding. We propose a carefully selected elevated interpass hold temperature and demonstrate that this restores the LTT capability to successfully mitigate residual tensile stresses. This paper is part of a thematic issue on Nuclear Materials.