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Your search keyword '"Nugget Formation"' showing total 2 results
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2 results on '"Nugget Formation"'

1. Mechanical properties and nugget evolution in resistance spot welding of Zn–Al–Mg galvanized DC51D steel

Author

Zhao Linlin, Lu Yue, Xiong Ziliu, Sun Li, Qi Jianjun, Yuan Xinjian, and Peng Jian

Subjects
steel, rsw welding, microstructure, coating evolution, nugget formation, Technology, Chemical technology, TP1-1185, Chemicals: Manufacture, use, etc., TP200-248
Abstract

Zn–Al–Mg coating galvanized steel in resistance spot welded (RSW) in different configurations of DC51D was investigated to illustrate the nugget evolution process and mechanical properties of the joints. Results show that the microstructure of welded joints can be divided into nugget zone (FZ), heat-affected zone (HAZ), and base metal zone (BM). FZ was composed of lath martensite. The average hardness value of the weld joint was 110 HV0.2 while the FZ was up to 300 HV0.2 due to the formation of lath martensite. The failure modes can be divided into interface fracture (IF) and pull-out fracture occurred (PF) under different welding parameters, in which shear dimples showed had a typical plastic fracture morphology. The best range for welding parameters was found to be 12–18 cycles in which the nugget diameter reached 5.5 mm. The process of nugget evolution in HAZ and FZ was discussed.

Published
2023
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2. Effect of zinc coating on delay nugget formation in dissimilar DP600-AISI304 welded joints obtained by the resistance spot welding process

Author

Pérez de la Parte, Mercedes, Espinel Hernández, Alejandro, Sánchez Orozco, Mario César, Sánchez Roca, Angel, Jiménez Macías, Emilio, Blanco Fernández, Julio, Carvajal Fals, Hipólito, 0000-0001-9158-4053, 0000-0003-4192-363X, 0000-0003-1390-9582, 0000-0002-1384-0493, 0000-0001-6749-4592, 0000-0002-7351-5342, and 0000-0001-5061-8763

Subjects
Dynamic resistance, Materials science, Mechanical Engineering, Metallurgy, Process (computing), chemistry.chemical_element, Zinc, Welding, Dissimilar joints, engineering.material, Delay nugget formation, Industrial and Manufacturing Engineering, law.invention, Computer Science Applications, chemistry, Coating, law, Control and Systems Engineering, Galvanized steel, engineering, Resistance spot welding, Spot welding, Software, Nugget Formation
Abstract

This paper researches the effect of zinc coating of galvanized DP600 steel on the dynamic resistance and the delayed nugget formation of dissimilar DP600 - AISI304 welded joints, obtained with resistance spot welding process (RSW). The RSW evaluations consisted of determining, from the dynamic resistance curves, the time involved in the different stages of the process, particularly the beginning of nugget formation. The experimental results showed that, from the dynamic resistance curves, it is possible to identify 8 distinct stages during the welding of galvanized DP600 steel and AISI304 stainless steel. In the case of the welding of uncoated DP600 steel with AISI304, only 6 stages are identified (except for stages 2 and 3), which are directly related to the heating, softening and melting of the galvanic coating. The energy used in stages 2 and 3, causes a delay in the beginning of nugget formation for welded joints obtained with galvanized DP600 steel compared to uncoated DP600 - AISI304 welded joints, reaching values between 37.28 ms and 52.29 ms for the welding conditions analyzed. Monitoring the time duration of stages 2 and 3, as defined from the analysis of the dynamic resistance curves, could be used as a tool to predict the beginning of nugget formation in the welding of galvanized steels, to avoid undesirable phenomena such as expulsion and to guarantee the quality of the welded joints.

Published
2022

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