Next Article in Journal
In Situ Observation of Crystal Rain and Its Effect on Columnar to Equiaxed Transition
Next Article in Special Issue
Tool Wear Characteristics and Effect on Microstructure in Ti-6Al-4V Friction Stir Welded Joints
Previous Article in Journal
Grain Boundary Assemblies in Dynamically-Recrystallized Austenitic Stainless Steel
Previous Article in Special Issue
The Interfacial Microstructure and Mechanical Properties of Diffusion-Bonded Joints of 316L Stainless Steel and the 4J29 Kovar Alloy Using Nickel as an Interlayer
Article Menu

Export Article

Open AccessArticle
Metals 2016, 6(11), 270; doi:10.3390/met6110270

Weldability and Monitoring of Resistance Spot Welding of Q&P and TRIP Steels

1
Faculty of Science and Technology, Free University of Bozen-Bolzano, 39100 Bolzano, Italy
2
Department of Management and Production Engineering, Politecnico di Torino, 10129 Torino, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Giuseppe Casalino
Received: 12 October 2016 / Revised: 4 November 2016 / Accepted: 4 November 2016 / Published: 8 November 2016
View Full-Text   |   Download PDF [6016 KB, uploaded 8 November 2016]   |  

Abstract

This work aims at investigating the spot weldability of a new advanced Quenching and Partitioning (Q&P) steel and a Transformation Induced Plasticity (TRIP) steel for automotive applications by evaluating the effects of the main welding parameters on the mechanical performance of their dissimilar spot welds. The welding current, the electrode tip voltage and the electrical resistance of sheet stack were monitored in order to detect any metal expulsion and to evaluate its severity, as well as to clarify its effect on spot strength. The joint strength was assessed by means of shear and cross tension tests. The corresponding fracture modes were determined through optical microscopy. The welding current is the main process parameter that affects the weld strength, followed by the clamping force and welding time. Metal expulsion can occur through a single large expulsion or multiple expulsions, whose effects on the shear and cross tension strength have been assessed. Longer welding times can limit the negative effect of an expulsion if it occurs in the first part of the joining process. The spot welds exhibit different fracture modes according to their strengths. Overall, a proper weldability window for the selected process parameters has been determined to obtain sound joints. View Full-Text
Keywords: dissimilar resistance spot welding; quenching and partitioning steel; transformation induced plasticity steel; welding parameters; welding monitoring; mechanical strength; microstructures; fracture modes dissimilar resistance spot welding; quenching and partitioning steel; transformation induced plasticity steel; welding parameters; welding monitoring; mechanical strength; microstructures; fracture modes
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Russo Spena, P.; De Maddis, M.; D’Antonio, G.; Lombardi, F. Weldability and Monitoring of Resistance Spot Welding of Q&P and TRIP Steels. Metals 2016, 6, 270.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top