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

被引：14
作者：
Rajalingam, Paluchamy [1 ]
Rajakumar, Selvarajan [1 ,2 ]
Balasubramanian, Visvalingam [2 ]
Sonar, Tushar [3 ]
Kavitha, Subramanian [4 ]
机构：
[1] Annamalai Univ, Mech Engn, Annamalai Nagar, Chidambaram 608002, Tamil Nadu, India
[2] Annamalai Univ, Ctr Mat Joining & Res CEMAJOR, Dept Mfg Engn, Chidambaram 608002, Tamil Nadu, India
[3] South Ural State Univ, Inst Engn & Technol, Dept Welding Engn, Chelyabinsk 454080, Russia
[4] Annamalai Univ, Elect & Instrumentat Engn, Chidambaram 608002, Tamil Nadu, India
来源：
MATERIALS TESTING | 2023年 / 65卷 / 01期
关键词：
DP-1000; steel; hardness; microstructure; resistance spot welding; softening of HAZ; tensile shear fracture load; WELDING PARAMETERS; DP1000; STEEL; GALVANIZED DP1000; STRENGTH; BEHAVIOR; OPTIMIZATION; WELDABILITY; SHEETS;
D O I：
10.1515/mt-2022-0236
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：94 / 110
页数：17
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