本文主要研究内容
作者（2019）在《Friction stir spot welding of SPCC low carbon steel plates at extremely low welding temperature》一文中研究指出：Friction stir spot welding(FSSW) was applied to 2.0 mm thick steel plate cold-rolled commercial(SPCC)low carbon steel plates at a very low rotation speed that ranged from 5 to 50 rpm, which was much lower than that generally used for the conventional FSSW technique. Due to the very low heat input, the welding processes could therefore be completed at a peak welding temperature below 160℃. As a result,a significantly refined microstructure with an average grain size of about 0.41 μm was formed in the stir zone of the joints and the J1{0–11}<-211> and J2{1–10}<-1–12> shear textures were the dominant components, which are different from the D1{11–2}<111> and D2{-1–12}<111> shear textures formed in the conventional FSSW joints. In addition, no heat affected zone could be detected along the crosssectional plane of the joints. Although a few void-like non-bonded areas were still observed along the interface between the upper and lower steel plates, the shear tensile loads of the joints increased to about 10.0 kN when welded at a condition of 8 t, 20 rpm and 30s, and the joints fractured through the plug failure mode.
Abstract
Friction stir spot welding(FSSW) was applied to 2.0 mm thick steel plate cold-rolled commercial(SPCC)low carbon steel plates at a very low rotation speed that ranged from 5 to 50 rpm, which was much lower than that generally used for the conventional FSSW technique. Due to the very low heat input, the welding processes could therefore be completed at a peak welding temperature below 160℃. As a result,a significantly refined microstructure with an average grain size of about 0.41 μm was formed in the stir zone of the joints and the J1{0–11}<-211> and J2{1–10}<-1–12> shear textures were the dominant components, which are different from the D1{11–2}<111> and D2{-1–12}<111> shear textures formed in the conventional FSSW joints. In addition, no heat affected zone could be detected along the crosssectional plane of the joints. Although a few void-like non-bonded areas were still observed along the interface between the upper and lower steel plates, the shear tensile loads of the joints increased to about 10.0 kN when welded at a condition of 8 t, 20 rpm and 30s, and the joints fractured through the plug failure mode.
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