In situ analysis of the strain evolution during welding using low transformation temperature filler materials. (3rd April 2019)

• Record Type: Journal Article
• Authors: Dixneit, Jonny; Vollert, Florian; Kromm, Arne; Gibmeier, Jens; Hannemann, Andreas; Fischer, Torben; Kannengiesser, Thomas
• Is Part Of: Science and technology of welding & joining. Volume 24:Number 3(2019)
• Page Start: 243
• Page End: 255
• Publication Date: 2019-04-03
• Subjects: Low transformation temperature filler materials -- dilution -- phase transformation -- multi-pass welding -- GMAW -- strain -- synchrotron diffraction -- ADXRD; Welding -- Periodicals; Joints (Engineering) -- Periodicals; Surfaces (Technology) -- Periodicals; 671.52
• DOI: 10.1080/13621718.2018.1525150
• Languages: English
• ISSNs: 1743-2936

Abstract

ABSTRACT: Compared to conventional welding consumables using low transformation temperature (LTT) filler materials is an innovative method to mitigate tensile residual stresses due to delayed martensite transformation of the weld. For the effective usage of LTT filler materials, a deeper understanding of the complex processes that lead to the final residual stress state during multi-pass welding is necessary. Transformation kinetics and the strain evolution of multi-pass welds during welding were investigated in situ at the beamline HEMS@PETRAIII, Germany. Compared to conventional welds, the total strain was reduced and compression strain was achieved when using LTT filler materials. For an optimal use of the LTT effect in the root of multi-pass welds, the alloying concept must be adapted taking care of dilution.