Study on precise weld diameter validations by comparing destructive testing methods in resistance spot welding

IF 2.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Christian Mathiszik, Johannes Koal, Jörg Zschetzsche, Uwe Füssel, Hans Christian Schmale
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Abstract

The torsion test is rarely used for resistance spot-welded joints since they are not subjected to torsion in applications. Normal, shear, and/or peel loads are usually the main stresses. Extensive scientific investigations in the context of Kunsmann’s dissertation date back more than 50 years. These investigations are still the basis of ISO 17653 and the German guideline DVS 2916-1. Recent scientific investigations only use torsion tests, but do not describe the reason for its use. A decisive advantage of the torsion test over the other standardized destructive testing methods lies in the types of fracture modes that occur and the properties of the fracture surfaces. Torsional loading results in either interfacial or button-pulled fracture modes. No material residues occur on the fracture surfaces for ductile and advanced high-strength steels. Hence, the measurement of weld diameter is achievable with minimal constraints, resulting in reduced variability and facilitating objective assessments of spot welds. This article delineates these attributes through a comparative analysis of various destructive testing methods employing statistical approaches. Additionally, the article expounds on the design concept of the developed rig for conducting torsion tests on spot welds.

Abstract Image

通过比较电阻点焊中的破坏性测试方法验证精确焊缝直径的研究
扭转试验很少用于电阻点焊接头,因为它们在应用中不会受到扭转。法向、剪切和/或剥离载荷通常是主要应力。根据 Kunsmann 的论文进行的广泛科学研究可追溯到 50 多年前。这些研究仍然是 ISO 17653 和德国 DVS 2916-1 指南的基础。最近的科学研究只使用了扭转试验,但没有说明使用扭转试验的原因。与其他标准化破坏性试验方法相比,扭转试验的决定性优势在于发生断裂的模式类型和断裂面的特性。扭转加载会导致界面断裂或按钮拉伸断裂模式。韧性钢和高级高强度钢的断裂表面不会出现材料残留。因此,在测量焊缝直径时只需最小的限制,从而减少了变异性,有利于对点焊进行客观评估。本文通过采用统计方法对各种破坏性测试方法进行比较分析,对这些特性进行了描述。此外,文章还阐述了所开发的对点焊缝进行扭转测试的钻机的设计理念。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Welding in the World
Welding in the World METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
4.20
自引率
14.30%
发文量
181
审稿时长
6-12 weeks
期刊介绍: The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.
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