Work

Effect of beam shaping in laser welding on the microstructure and transformation temperatures of NiTiHf high-temperature shape memory alloy

Year: 2025

Type: article

Abstract: Beam shaping in laser welding of NiTiHf high temperature shape memory alloy (HTSMA) is explored for the first time with promising perspectives. Such alloys are typically characterized by high brittleness, therefore advanced thermal processing may limit their cracking susceptibility. In details, novel prospective in laser welding regards the possibility of tuning the laser power distribution, namely beam shaping, which can module significantly the thermal cycle induced into the material. In this work, the effect of the beam shape and welding speed are explored on the cross section of the welded beads, highlighting the focus on the defects promoted. Moreover, the transformation temperatures of the martensitic transformation were checked from the base material to the welded one. It was demonstrated that beam shaping in laser welding can be a promising solution for adjusting the weldability of brittle materials.

Source: Procedia Structural Integrity

DOI: 10.1016/j.prostr.2025.07.007

Authors: C.A. Biffi, A.G. Demir, L. Caprio, J. Fiocchi, B. Previtali, A. Tuissi

Institutions: Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council, Politecnico di Milano

Language: English

Topic: Welding Techniques and Residual Stresses

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: diamond

Funders: European Commission, Consiglio Nazionale delle Ricerche, Center for Neuroscience Research

OpenAlex ID: W4412436601

FWCI:

Cites: 17

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Related to: 10