Tensile properties of fiber laser welded joints of high strength low alloy and dual-phase steels at warm and low temperatures

Laser, tungsten inert gas, and metal active gas welding of DP780 steel: Comparison of hardness, tensile properties and fatigue resistance

“…However, this influence can vary considerably depending on the welding method used, as this creates differences in the heat input capacity, welding speed and cooling rate. Although a number of previous researchers [4,[6][7][8][9] have studied the evolution of hardness and tensile behavior in welded DP steels, there have been very few studies thus far pertaining to how the choice of welding method affects the microstructure and mechanical properties of DP steels [10]. Furthermore, welded DP steels used in automotive applications are inherently exposed to cyclic loading during use, which can lead to catastrophic fracture after a certain period of time.…”

Microstructure of fibre laser welded joint of dual phase steel with bake hardening steel

“…Due to the low carbon and alloying element content, BH steels have mainly ferritic microstructure. This microstructure is the consequence of lower strength, but better formability and weldability compared to DP steels [4,[13][14][15].…”

“…FZ and HAZ are characterized by increased hardness and decreased plastic properties. The welding process influences the weld imperfections, which are related to the weld geometry such as concavity, sagging, impurities or gaseous elements, porosity, pinholes or craters [13,14,24]. Several works were devoted to the laser welding of different DP steels, but fewer works were focused on welding of DP steels with BH steels.…”

“…Some authors studied the effect of hardness increase in the FZ and HAZ in DP steels after laser welding process on the properties of joints. The higher hardness causes reduction of formability and even significant lack of toughness [3,4,[13][14][15]. Several authors described the reduction of hardness in the tempered region of HAZ; a phenomenon is generally known as HAZ softening.…”

Influence of Test Temperature on the Tensile Properties along the Thickness in a Friction Stir Welded Aluminum Alloy

“…Page 1 of 15 2 Therefore, aerospace and automotive manufacturers are continuously looking for effective methods to achieve this goal. One of the popular methods to increase the fuel efficiency is to use the auto-body parts made of stronger materials, which will help in down-gauging, leading to a decrease in the vehicle weight [2,3] . Advanced high-strength aluminum alloy is a family of such materials and also lightweight, which can be used to replace the conventional heavy materials used in aerospace and auto-body structures.…”