Cart Summary
0 item(s) ($0.00)
Product Search
Product Details:

Methods to Improve Cross-Tension Spot Weld Strength of Quenched and Partitioned Steel Spot Welds

Mechanical properties of Resistance Spot Welds (RSW) in Quenched and Partitioned (Q&P) steels have been shown to be reduced under traditional spot-welding conditions. These challenges have been noted in both zinc coated and uncoated grades during quasi-static tensile tests. Reduced spot weld strength of Q&P steels is primarily attributed to the brittle microstructure observed in the fusion zones of these spot welds. To improve the fracture toughness of Q&P 1180 spot welds, four different post-weld process modification parameters were added to the spot weld schedule. Compared to the baseline spot welds made without any process modifications, spot welds made with these four post-weld process modifications exhibited 30-60% increase in the cross-tension spot weld strength. Microhardness tests, microstructural characterizations, and elemental segregation analyses were performed on these spot welds to understand the underlying microstructural evolutions that resulted in an increase in the spot weld strength of Q&P steels. Results indicate reduction of phosphorus segregation at the edge of fusion zone has been the predominant strengthening mechanism that resulted in maximizing the strength/ductility of spot welds.
Product:
2023 Intl. Symposium on New Developments in AHSS
PR-298-025
M. Subramanian
June 19, 2023
PDF
$15.00
$25.00
$25.00
Available for Immediate Download