The structure and properties of filler metal-free laser beam welded joints in steel S700MC subjected to TMCP

Jacek Górka; Sebastian Stano

doi:10.1117/12.2256176

8 December 2016 The structure and properties of filler metal-free laser beam welded joints in steel S700MC subjected to TMCP

Jacek Górka, Sebastian Stano

Author Affiliations +

Proceedings Volume 10159, Laser Technology 2016: Progress and Applications of Lasers; 101590K (2016) https://doi.org/10.1117/12.2256176
Event: XIth Symposium on Laser Technology, 2016, Jastarnia, Poland

Abstract

The research-related tests aimed to determine the effect of filer-metal free laser beam welding on the structure and properties of 10 mm thick steel S700MC subjected to the Thermo-Mechanical Control Process (TMCP). The nondestructive tests revealed that the welded joints represented quality level B according to the requirements of standard 13919-1. The destructive tests revealed that the joints were characterised by tensile strength being by approximately 5% lower than that of the base material. The tests of thin foils performed using a high-resolution scanning transmission electron microscope revealed that filler metal-free welding led to the increased amount of alloying microagents (Ti and Nb) in the weld (particularly near fusion line) in comparison with welding performed using a filler metal. The significant content of hardening phases in the welds during cooling resulted in considerable precipitation hardening through finedispersive (Ti,Nb)(C,N) type precipitates (several nm in size) leading to the deterioration of plastic properties. The destructive tests revealed that the joints were characterised by tensile strength being by approximately 5% lower than that of the base material. The increase in the concentration of microagents responsible for steel hardening (Ti and Nb) also contributed to the decrease in weld toughness being below the allowed value of 25 J/cm².

Citation Download Citation

Jacek Górka and Sebastian Stano "The structure and properties of filler metal-free laser beam welded joints in steel S700MC subjected to TMCP", Proc. SPIE 10159, Laser Technology 2016: Progress and Applications of Lasers, 101590K (8 December 2016); https://doi.org/10.1117/12.2256176

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