Structural and Mechanical Characterization of Stainless Steel Joints Realized by CMT Process

Abstract:

CMT weld brazing process (Cold Metal Transfer) knows a higher applicability in various industries (aeronautic, automobile) due its advantages compared with other welding processes. The paper presents the experimental results obtained on sheets joints using austenitic stainless steel mark 304 of 1 mm thick in butt and overlap variants using CuSi3 filler alloy of 1.2 mm diameter. The macroscopic analysis shows that were not presented welding defects and the microscopic examination did not showed welding defects such as microcracks. After the mechanical tests it was observed that al the tested specimens the fracture occurred in the base metal except the sample 1 where the fracture occurred in the welding zones. The bending test showed that all the samples were bent to 180° without cracks which assure good mechanical resistance to deformation. ΔHV1 estimator values ​​determined in the characteristic areas of the joints shows that at sample 2 there are structural hardening tendencies in the zones BM₁-WELD and BM₂-WELD with values ​​of 36% respectively 28.5% attesting moderate structural hardening (ΔHV1<50%), the brittle-type fracture risk in these areas is considered low.

• Periodical: Key Engineering Materials (Volume 498)
• Pages: 161-172
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.498.161
• Online since: January 2012
• Authors: Radu Alexandru Roşu, Romulus Pascu, Sorin Drăgoi
• Keywords: CMT Process, Mechanical Tests, Stainless Steel (SS), Structure

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