Effect of interpass temperature on residual stresses in multipass welds produced using low transformation temperature filler alloy
Effect of interpass temperature on residual stresses in multipass welds produced using low transformation temperature filler alloy
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DOI：
10.1179/1362171813y.0000000162
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发表时间：
2014-01-01
影响因子：
3.3
通讯作者：
Bhadeshia, H. K. D. H.
中科院分区：
文献类型：
--
作者：
Ramjaun, T.;Stone, H. J.;Bhadeshia, H. K. D. H.
通过低奥氏体到马氏体转变温度利用转变塑性的焊接填充合金提供了降低强钢焊接中的残余应力的有效方法。然而，在多道焊接中，来自随后的焊接道的热输入可能不足以再转变先前的焊接道，导致热致应变的积累和升高的残余应力。在这项工作中，周围产生的残余应力分布与马氏体焊接填充合金，在低温下转换的电弧焊接已被研究作为一个函数的通道沉积的数量和层间温度。据发现，当层间温度高于焊缝金属的转变温度时，整个多道焊缝转变为一个单一的实体，从而允许最佳利用的转变塑性。相反，具有相对低的层间温度的新金属的沉积导致下面的层中的残余应力增加，从而减少或消除先前产生的有益应力状态。
Weld filler alloys that exploit transformation plasticity through low austenite to martensite transformation temperatures offer an effective method of reducing residual stresses in strong steel welds. However, in multipass welds, the heat input from later weld passes may be insufficient to retransform prior welding passes, leading to the accumulation of thermally induced strains and elevated residual stresses. In this work, the residual stress distributions produced around arc welds fabricated with a martensitic weld filler alloy that transforms at a low temperature have been studied as a function of the number of passes deposited and the interpass temperature. It is found that when the interpass temperature is above the transformation temperature of the weld metal, the entire multipass weld transforms as a single entity, thus permitting the optimum exploitation of the transformation plasticity. In contrast, the deposition of new metal with a relatively low interpass temperature leads to increased residual stresses in the underlying layers, reducing or eliminating the beneficial stress states previously created.