9/18/2023 0 Comments Welding of hss square![]() ![]() ![]() ![]() The impact toughness of the best weld condition overmatched the base material by over 37%, at both − 40 and − 60 ☌. Results show that FSW enables welding HSS within the intercritical temperature domain. Microscopic analyses, including optical microscopy and electron backscatter diffraction, were used to evaluate the microstructure. The effect of the different peak temperatures was evaluated by mechanical testing, including bending, tensile testing with digital imaging correlation, Charpy impact test, and hardness measurements. Temperatures were measured using thermocouples positioned at the mid-thickness of the workpiece, at 5 to 10 mm from the joint line. A HSS produced by a thermo-mechanically controlled process was welded by FSW with peak temperatures, measured within the processed zone, ranging from about 900 to 650 ☌. This work evaluates the influence of different FSW peak temperatures and cooling rates on the properties of a modern HSS. Friction stir welding (FSW) can join HSS at low peak temperatures, better preserving the properties of the base material. The ability to take full advantage of these modern HSS is limited by their weldability. The need for weight reduction without compromising load-bearing capacity has driven the development of modern high-strength steels (HSS). ![]()
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