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首页> 外文期刊>Advanced Science Letters >Study on Weldability of Dissimilar Steel Between Q345R and 2205
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Study on Weldability of Dissimilar Steel Between Q345R and 2205

机译：Q345R与2205之间的异种钢可焊性研究

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The weldability of dissimilar metal of 8 mm thickness between Q345R and 2205 is studied. Results indicate that in the Q345R-WM interface, there is a decarburized layer close to the fusion line at Q345R side and a carbon-enriched layer at weld metal (WM) side, a solidification transition region showing as sandwich structure appears in SMAW side. In duplex stainless steel 2205 there is no obvious interface between the heat affected zone (HAZ) and the weld beam. In weld metal, the microstructure is austenite and acicular ferrite, of which the content of austenite is more, and the structure of GTAW side is more fine and homogenous. The tensile strength of the welded joint is up to 575MPa, and the fracture occurs in Q345R base metal with the ductility mode, showing that the welded joint has good ductility and toughness. In the interface between Q345R and weld beam, the hardness shows an upward trend overall. The highest value occurs in the weld beam, followed by the heat affected zone, in Q345R base metal low hardness zone appears, and near the fusion line of Q345R base metal side appears a peak. While in 2205-WM side, the average hardness in heat affected zone is highest, and in weld beam is the lowest. In joint the average hardness of GTAW side is greater than that of SMAW side. So to ensure the mechanical properties and corrosion resistance of welded joint, welding materials with relatively higher content of austenitic forming element Ni and proper linear energy should be chosen and in welding the layer temperature should be controlled to reduce the fusion ratio.
机译：研究了Q345R和2205之间厚度为8 mm的异种金属的可焊性。结果表明，在Q345R-WM界面处，靠近Q345R侧的熔合线处有一个脱碳层，在焊缝金属（WM）侧有一个富碳层，在SMAW侧出现了一个显示为夹心结构的凝固过渡区。在双相不锈钢2205中，热影响区（HAZ）和焊接梁之间没有明显的界面。在焊缝金属中，显微组织为奥氏体和针状铁素体，其中奥氏体含量较多，GTAW侧组织更细，均匀。焊接接头的抗拉强度高达575MPa，在Q345R母材中以延性模式发生断裂，表明焊接接头具有良好的延性和韧性。在Q345R和焊接梁之间的界面中，硬度总体呈上升趋势。最大值出现在焊接束中，然后是热影响区，在Q345R母材低硬度区出现，并且在Q345R母材侧的熔合线附近出现一个峰值。而在2205-WM侧，热影响区的平均硬度最高，而焊缝中的平均硬度最低。在接合处，GTAW侧的平均硬度大于SMAW侧的平均硬度。因此，为确保焊接接头的机械性能和耐腐蚀性，应选择奥氏体形成元素Ni含量相对较高且线能量适当的焊接材料，并在焊接过程中控制层温度以降低熔合率。

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