| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Metallic Coated Advanced Steels
|
| Presentation Title |
Shortening the Pulse during Resistance Spot Welding of Advanced High Strength Steels |
| Author(s) |
Saeed Shiri, Benjamin Hilpert, Holger Schubert, Luke N. Brewer |
| On-Site Speaker (Planned) |
Saeed Shiri |
| Abstract Scope |
Occurrence of liquid metal embrittlement (LME) during resistance spot welding (RSW) of advanced high strength steels (AHSS) is a big problem for expanding their utilization in automotive industry. Understanding the interplay between RSW parameters and LME is thus of critical importance. This presentation will discuss the impact of weld time and current as the two main RSW parameters on LME for a dual phase AHSS with high ductility, namely, DH1200. The results show that reducing weld time from 420 to 210 ms has almost halved (53.66%) the LME severity; however, at shorter times like 105 ms, increased current from 7.4 to 12 kA can trigger higher LME susceptibility despite of generating less input heat compared to 420 ms. Also, short double pulse RSW using 12 and 15 kA at 105 ms leads to larger nuggets and enhanced tensile shear strength compared to single pulse yet accompanied by greater LME vulnerability. |