Quantitative Weld Quality Acceptance Criteria: An Enabler for Structural Lightweighting and Additive Manufacturing Recent developments in fracture-mechanics based defect acceptance criteria, as well as robust computational techniques, are higlighted
Quantitative Weld Quality Acceptance Criteria: An Enabler for Structural Lightweighting and Additive Manufacturing Recent developments in fracture-mechanics based defect acceptance criteria, as well as robust computational techniques, are higlighted
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DOI：
10.29391/2020.99.004
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发表时间：
2020-02-01
期刊：
影响因子：
2.2
通讯作者：
Dong, P.
中科院分区：
文献类型：
--
作者：
Dong, P.
现有的各种规范和标准以及推荐规程中规定的焊接质量验收准则大多是经验性的。从历史上看，这些基于工艺的标准已经足够用于焊接结构施工的质量控制目的。然而，随着实现结构轻量化的竞争加剧，越来越需要更多的定量质量接受（也称为基于目的的适用性）标准。这是因为各种新形式的不连续和接缝结构（例如，不同材料的接缝）不能很容易地与现有的验收标准相关联。即使现有的标准可以适用，最近的研究结果表明，当处理薄规和轻量结构时，现有的标准对一些人来说可能过于保守，对另一些人来说可能不保守。对于增材制造的金属部件也存在类似的情况，可以将其视为包含随机分布在整个部件体积上的不连续的“所有焊接金属”部件。本文将首先重点介绍焊接质量定量验收标准的最新发展，其中一些是通过先进的断裂力学分析技术实现的。在结构轻量化和增材制造方面的应用将通过一些现实世界的例子进行演示。最后，将根据这些发展讨论为确保结构完整性和建筑成本效益而提出的方法的更广泛应用所产生的影响。
Most of the existing weld quality acceptance criteria stipulated in various codes and standards, as well as in recommended practices, are empirical in nature. Historically, these workmanship-based criterias have been adequate for quality control purposes in construction of welded structures. However, as the competition for achieving structural lightweighting intensifies, more quantitative quality acceptance (also known as fitness-for-purpose based) criteria are increasingly called for. This is because various new forms of discontinuities and joint configurations (e.g., dissimilar materials joints) cannot be readily related to existing acceptance criteria. Even if existing criteria can be made applicable, recent research findings have shown that existing criteria can be excessively conservative for some and unconservative for others when dealing with thin gauge and lightweight construction. A similar situation exists for additively manufactured metallic components, which can be viewed as "all weld metal" components containing randomly distributed discontinuities over the entire component volume. In this paper, some of the recent developments in quantitative weld quality acceptance criteria will be first highlighted, some of which are made possible by advanced fracture mechanics analysis techniques. Applications in structural lightweighting and additive manufacturing will then be demonstrated with some real-world examples. Finally, implications on a broader application of the methodologies presented for ensuring both structural integrity and cost-effectiveness in construction will be discussed in light of these developments.