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研究了以TA1/X65管线钢为母材的复合板焊接接头的显微组织和性能,对焊接接头弯曲过程进行了有限元模拟分析。结果表明:钛焊缝区显微组织主要为锯齿状α-钛+针状α-钛+晶界β-钛,热影响区组织为粗大的锯齿状α-钛;弯曲试样均在钛层焊缝的热影响区断裂,通过SEM测试发现,断口为韧窝形貌,属于韧性断裂;钛焊缝有限元分析结果得出未焊透区形成缺口效应,在钛焊缝热影响区产生应力集中,随着未焊透尺寸的增大,应力集中加剧,焊接接头的弯曲角度减小,当未焊透达到1.5 mm时,弯曲角度仅为16°。
The microstructure and properties of the welded joint of clad plate based on TA1 / X65 pipeline steel were studied. The bending process of the welded joint was simulated by finite element method. The results show that the microstructure of titanium weld zone is mainly serrated α-titanium + acicular α-titanium + grain boundary β-titanium, and the heat-affected zone is coarse serrated α-titanium. The heat affected zone (HAZ) of the weld is fractured. The SEM results show that the fracture is dimple-like and belongs to the ductile fracture. Finite element analysis of the weld shows that the weldless zone is notched and the stress is generated in the HAZ of the weld Concentration, as the size of the penetration increases, the stress concentration aggravates and the bending angle of the welding joint decreases. When the penetration reaches 1.5 mm, the bending angle is only 16 °.