Tensile shear fracture load bearing capability, softening of HAZ and microstructural characteristics of resistance spot welded DP-1000 steel joints-Reference-Cited by-同舟云学术

Tensile shear fracture load bearing capability, softening of HAZ and microstructural characteristics of resistance spot welded DP-1000 steel joints

Published:2023-01-01 Issue:1 Volume:65 Page:94-110
ISSN:0025-5300
Container-title:Materials Testing
language:en
Short-container-title:

Author:

Rajalingam Paluchamy¹,Rajakumar Selvarajan¹²^ORCID,Balasubramanian Visvalingam²^ORCID,Sonar Tushar³^ORCID,Kavitha Subramanian⁴

Affiliation:

1. Mechanical Engineering , Annamalai University , Annamalai Nagar 608002 , Tamil Nadu , India

2. Centre for Materials Joining and Research (CEMAJOR) , Department of Manufacturing Engineering, Annamalai University , Chidambaram 608002 , Tamil Nadu , India

3. Department of Welding Engineering , Institution of Engineering and Technology, South Ural State University, Chelyabinsk 454080 , Russia

4. Electronics and Instrumentation Engineering , Annamalai University , Chidambaram 608002 , Tamil Nadu , India

Abstract

Abstract The main objective of this investigation is to enhance the tensile shear fracture load (TSFL) bearing capability and minimize softening in heat affected zone (HAZ) of resistance spot welded DP-1000 steel spot joints for automotive applications. The lap tensile and cross tensile shear fracture load tests (LTSFL and CTSFL) were conducted. The process parameters were optimized using numerical and graphical optimization techniques to maximize the TSFL capability of spot joints. The microstructure of spot joints was studied using optical microscopy and correlated to TSFL and hardness of spot joints. Results showed that DP-1000 steel spot joints made using the welding power of 70 W, welding time of 1.0 s, electrode pressure of 4.25 MPa showed maximum LTSFL of 22 kN and CTSFL of 9.1 kN. The parametric optimization showed 46.66, 45.77, 22.33 and 9.87% increase in LTSFL, CTSFL, nugget zone hardness and HAZ hardness of DP-1000 steel spot joints. The higher TSFL and nugget hardness of spot joints is mainly attributed to the evolution of finer martensitic sandwiching ferrite phases in nugget zone and lower softening of HAZ than other joints. Welding power showed significant influence on TSFL of spot joints followed by welding time and electrode pressure.

Publisher

Walter de Gruyter GmbH

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Link

https://www.degruyter.com/document/doi/10.1515/mt-2022-0236/pdf

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