缆式焊丝埋弧焊残余应力有限元分析
Finite element analysis of residual stress of submerged arc welded joint using cable-type wire
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摘要: 采用直径为2.4 mm的7根分焊丝，其中一根分焊丝（称为中心丝）位于中间，其余6根分焊丝（称为外围丝）围绕中心丝绞合组成直径为7.2 mm的缆式焊丝.试验用22 mm厚DH36船用钢板进行平对接缆式焊丝埋弧焊，采用小孔法对焊接接头进行残余应力测试；基于热弹塑性理论，建立缆式焊丝埋弧焊残余应力有限元数值分析模型，利用ANSYS软件对缆式焊丝埋弧焊残余应力进行模拟计算.结果表明，缆式焊丝埋弧焊的应力分布特征和幅值与单丝埋弧焊相近，纵向应力在焊缝及近缝区表现为拉应力，应力峰值为363 MPa；横向应力较小，焊缝上下部位呈现拉应力，中间呈现压应力.Abstract: The cable-type welding wire (CWW) was used as filler for submerged arc welding (SAW)process, which is comprised of seven wires with a diameter of 2.4 mm. One wire is in the center, while others uniformly distribute around it. The finite element numerical analysis model was established for the residual stress of CWW-SAW joint, based on thermal elastoplastic theory. The residual stress was simulated through ANSYS software. The experimental results obtained by the hole drilling method agreed well with the simulated results on the top surface, verifying the exactness of the model. The results show that the stress distribution and amplitude of the CWW-SAW joint are basically corresponding with that of the single-wire SAW joint. The longitudinal stress presented tensile effect in the weld seam and at the region near fusion line, while the peak stress was 363 MPa. The transverse stress was a bit small, presenting tensile effect on upper and the lower parts while compressed effect appeared in middle part.
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