The applicability of using low transformation temperature welding wire to minimize unwanted residual stresses and distortions
The applicability of using low transformation temperature welding wire to minimize unwanted residual stresses and distortions
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DOI：
10.1016/j.ijpvp.2013.04.014
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发表时间：
2013-10-01
影响因子：
3
通讯作者：
Gray, Thomas G. F.
中科院分区：
文献类型：
--
作者：
Camilleri, Duncan;McPherson, Norman;Gray, Thomas G. F.
钢压力容器的熔焊是制造这种结构最经济的方法之一。然而，在熔融区域处的高度局部化的热分布引起焊缝和周围基材的不均匀加热/膨胀和冷却/收缩，从而引起残余应力和变形。有几种技术可以最大限度地减少焊接变形和残余应力[1]。一种可行且有效的缓解技术，即改变焊接过程中产生的固有残余应力，包括使用低相变起始温度的焊丝[2-4]。通过改变填充材料和在熔合区和热影响区产生的冶金转变，焊缝处的焊接区域可产生压缩残余应力[2]。因此，通过确定焊丝的适当化学成分，可以显着减少焊接变形。本研究的重点是建立使用不同的填充材料，以尽量减少焊接残余应力和变形的优点，通过热冶金弹塑性数值参数研究。采用三种不同的填充材料的对焊结构的数值模拟被认为是使用低相变温度焊丝的适用性进行了研究。预测的残余应力和变形给出了一个显着的进步，在理解和控制焊接变形的焊接构件。确定了填充材料的化学成分和最终熔合区成分，从而减少残余应力和变形。(C)2013爱思唯尔有限公司保留所有权利。
Fusion welding of steel pressure vessels provides one of the most economic methods for creating such structures. However, the highly localised heat distribution, at the fused region gives rise to non-uniform heating/expansion and cooling/contraction of the weld and the surrounding base material, consequently giving rise to residual stresses and distortion. Several techniques are available to minimize welding distortions and residual stresses [1]. One feasible and efficient mitigation technique, that alters the inherent residual stresses developed during welding, includes the use of low transformation start temperature welding wire [2-4]. By altering the filler material and metallurgical transformations developed at the fusion zone and heat affected zone, wielded regions at the weld line can give rise to compressive residual stresses [2]. Consequently by establishing the appropriate chemical composition of the welding wire, a significant reduction in welding distortions can be achieved. This study focuses on establishing the merits of using different filler materials to minimize welding residual stresses and distortion through a thermal-metallurgical-elasto-plastic numerical parametric study. Numerical modelling of butt welded structures using three different filler materials is considered and the applicability of using low transformation temperature welding wire is investigated. The predicted residual stresses and distortions give a significant advance in understanding and control of welding distortion in welded fabrications. The chemical composition of the filler material and ultimately fused zone composition, leading to reductions in residual stresses and distortions is identified. (C) 2013 Elsevier Ltd. All rights reserved.