双相型S22053不锈钢角焊缝连接拉伸试验研究

Tensile test study on fillet weld connections of S22053-grade duplex stainless steel

焊缝连接广泛应用于不锈钢结构生产和装配领域,但目前国内外专门关于不锈钢焊缝连接承载性能的研究较少。为研究国产双相型S22053不锈钢角焊缝搭接接头的承载性能,对6个正面角焊缝连接试件和5个侧面角焊缝连接试件进行了拉伸试验,测得了焊缝连接在拉伸作用下的极限荷载、极限强度等,并对焊缝随荷载的变形情况进行了测量。试验结果表明:正面角焊缝连接试件破坏截面平均角度约29°,并非45°理论值,其极限强度平均值973MPa,焊缝平均变形量为1.139mm。侧面角焊缝连接试件破坏截面平均角度约46°,比较接近45°理论值,其极限强度平均为637MPa,焊缝平均变形量为1.792mm。正面角焊缝连接试件焊缝极限强度为侧面角焊缝连接试件的1.53倍。

Weld connections have been widely used in fabrication and assembly of stainless steel structures. However, few experimental studies at home and abroad have been concentrated on the loading capacity of stainless steel welded connections. In order to investigate the loading capacity of the fillet weld connections of Chinese S22053-grade duplex stainless steel members, tensile tests were conducted on six specimens with transverse fillet weld connections and five specimens with longitudinal fillet weld connections. The ultimate load-bearing capacity and the ultimate strength of the welded connections were tested, and the deformation development with the load increment was measured as well. The test results indicate that the failure section angle is not 45° but an average of around 29°. The ultimate strength is 973MPa and the average deformation of welds is 1. 139mm for transverse fillet welding joint specimens. With an average of around 46°, the failure section angle is closed to 45° for longitudinal fillet welding joint specimens, For this kind of members, the ultimate strength is 637MPa and the average deformation of welds is 1. 792mm. The ultimate strength of transverse fillet welded connections is 1.53 times that of longitudinal fillet welded connections.