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Effects of Process Parameters on Spot Welding of TRIP and Quenching and Partitioning Steels
Author(s) -
Russo Spena Pasquale,
Cortese Luca,
De Maddis Manuela,
Lombardi Franco
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201600007
Subject(s) - spot welding , welding , materials science , quenching (fluorescence) , metallurgy , plasticity , composite material , trip steel , microstructure , shear (geology) , heat affected zone , electric resistance welding , joint (building) , lap joint , tension (geology) , ultimate tensile strength , structural engineering , martensite , engineering , fluorescence , quantum mechanics , physics
This study investigates the resistance spot welding between a quenching and partitioning (Q&P) steel and a transformation‐induced plasticity (TRIP) steel. The effects of welding current, electrode force, and welding time on microstructure and mechanical properties have been assessed by shear tension and hardness tests. Welding electrical parameters have been monitored to detect metal expulsion. An adequate shear strength of lap‐joint Q&P/TRIP spots is observed, with the best mechanical strength (14 kN) being obtained with a 7.5 kA current. Metal expulsion is detected for the highest current (9 kA), which limits the shear strength and nugget size of spot welds. The lap‐joint samples mainly break by partial thickness with button pull; interfacial fractures only occur in the samples with the smallest nuggets.