Assessment of the Solidification Cracking Susceptibility of Welding Consumables in the Varestraint Test by Means of an Extended Evaluation Methodology
Assessment of the Solidification Cracking Susceptibility of Welding Consumables in the Varestraint Test by Means of an Extended Evaluation Methodology
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通过扩展评估方法评估可变约束试验中焊接材料的凝固裂纹敏感性
DOI：
10.1002/adem.202101650
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发表时间：
--
影响因子：
3.6
通讯作者：
F. Vollert
中科院分区：
文献类型：
--
作者：
M. Thomas M;T. Kannengiesser;J. Gibmeier;F. Vollert
各种试验方法可用于评估材料在焊接过程中对凝固裂纹的敏感性。在广泛使用的变约束试验中，选择裂纹长度作为施加的弯曲应变的函数作为标准。不幸的是，裂纹长度不能单独表征材料行为，而是在不同程度上取决于所使用的各个测试参数，这使得结果的解释变得困难。此外，在不同的测试条件下，裂纹长度不具有可比性。为了克服这些缺点，我们开发了一种新的评估方法，该方法将机器的影响从材料行为中分离出来。测量的裂纹长度与焊接速度和变形时间规定的最大可能值有关。考虑裂纹的方向，数值计算该相对裂纹长度。在两种高合金马氏体焊接材料上进行的实验表明，与传统评估相比，可以比较不同的焊接参数。此外，应变速率被证明是一个合适的裂纹准则与Prokhorov的热裂纹模型。
Various test methods are available for assessing the susceptibility of materials to solidification cracking during welding. In the widely used Varestraint test, the crack length is selected as a criterion as a function of the applied bending strain. Unfortunately, the crack length does not characterize the material behavior alone but depends to varying degrees on the individual test parameters used, which makes the interpretation of the results difficult. In addition, the crack length is not comparable under different test conditions. To overcome these disadvantages, we have developed a novel evaluation methodology that decouples the machine influence from the material behavior. The measured crack length is related to the maximum possible value specified by welding speed and deformation time. This relative crack length is calculated numerically, considering the orientation of the cracks. Experiments on two high‐alloy martensitic welding consumables show that, in contrast to the conventional evaluation, a comparison of different welding parameters becomes possible. Furthermore, the strain rate proved to be a suitable crack criterion in agreement with Prokhorov's hot cracking model.