Evaluation of Formability and Mechanical Behavior of Laser-Welded Tailored Blanks Made of Interstitial-Free and Dual-Phase Steels

Abstract

An attempt has been made to produce laboratory scale laser-welded tailored blanks (LWTBs) with interstitial-free (IF, 300 MPa) and dual-phase (DP, 590 MPa) steel sheets with a thickness ratio of 2. Microstructures and textures of the base, weld, and heat-affected zones (HAZs) were examined using the scanning electron microscope and electron backscattered diffraction technique. The blanks were deformed using the standard limiting dome height (LDH) test setup, and the forming limit diagrams (FLDs) for base IF, DP, and welded blanks with two different weld orientations were constructed. The findings suggest that the FLD o of the welded blank lies in between that of parent IF and DP steel sheets. The formability of the welded blank is highly influenced by the weld orientation. The location of crack formation in the blanks changed with changing the weld orientation in the blanks. The formation of crack on different locations of the blank has been correlated with the local textural differences.

Neural Network-Based Multi-Objective Optimization of Adjustable Drawbead Movement for Deep Drawing of Tailor-Welded Blanks

“…TWBs were first used to overcome design challenges with existing materials, such as the Audi 100 floor panel [2,3]. Chatterjee et al [4] evaluated the formability and mechanical behavior of dual-phase TWBs; they discussed the effect of weld orientation on the formability of TWBs. Xia et al [5] investigated the formability of high-strength low-alloy (HSLA) steel TWBs welded using diode lasers.…”

Numerical investigation on forming behavior of friction stir tailor welded blanks (FSTWBs) during single-point incremental forming (SPIF) process

“…To study the weld line movement and formability of TWBs, many conventional forming methods have been attempted like limiting dome height (LDH) test [7], deep drawing [5], Erichsen cupping test [8], hemispherical dome stretching test [9], standard ball punch test [2] and cylindrical cup drawing (CCD) test, but no significant decrease has been found in the weld line movement. Now, for the homogeneous blanks, it has been found that the single-point incremental forming (SPIF) process results in the better formability compared to the conventional forming processes as the deformation during the SPIF process is due to the combined effect of bending and stretching [10].…”