Joining mechanism evolution of fusion welded TC4 titanium alloy/304 stainless steel dissimilar joint by GTAW

IF 3.1 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science and Technology of Welding and Joining Pub Date : 2023-10-06 DOI:10.1080/13621718.2023.2264572

Xiaohu Hao, Xinlong Wei, Shuhua Li, Zeqin Cui, Wenxian Wang, Honggang Dong, Weiguo Li

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引用次数: 0

Abstract

AbstractGas tungsten arc welding with a pure Cu filler wire was carried out to join the TC4 titanium alloy and 304 stainless steel. Filling pure Cu filler wire assisted with regulating welding current could effectively restrain the concentrated generation of Ti–Fe brittle intermetallic compounds. Three joining modes exist in the fusion welding titanium alloy and stainless steel. In the partial fusion welding mode, the TiCu phase decreased and the fine granular τ2 phase formed in the Ti/Cu interfacial zone, simultaneously, the molten zone consisted of a Cu solid solution and α-(Fe, Cr) phase formed at the Cu/Fe interface, resulting in mechanical interlocking effect and consequent high tensile strength of 363 MPa. Increasing the welding current would lead to the alloying of TixCuy phases, and then enhance the Ti/Cu interface.KEYWORDS: Titanium alloy/stainless steel dissimilar jointinterfacial joining mechanismintermetallic compoundsmicrostructuretensile strength Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was financially supported by the National Natural Science Foundation of China [grant number 52105389] and the Fundamental Research Program of Shanxi Province [grant number 20210302124113].

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GTAW熔焊TC4钛合金/304不锈钢异种接头连接机理演变

摘要采用纯铜焊丝进行TC4钛合金与304不锈钢的气体钨极电弧焊接。填充纯铜填充丝，配合调节焊接电流，可以有效抑制Ti-Fe脆性金属间化合物的集中生成。钛合金与不锈钢的熔焊存在三种连接方式。在部分熔焊方式下，TiCu相减少，Ti/Cu界面区形成细小的颗粒状τ2相，同时熔区由Cu固溶体和Cu/Fe界面处形成的α-(Fe, Cr)相组成，产生机械联锁效应，抗拉强度高达363 MPa。增大焊接电流可使TixCuy相合金化，从而增强Ti/Cu界面。关键词:钛合金/不锈钢异种接头，界面连接机制，金属化合物，显微组织，抗拉强度基金资助:国家自然科学基金项目[批准号:52105389]和山西省基础研究计划项目[批准号:20210302124113]。

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来源期刊

Science and Technology of Welding and Joining 工程技术-材料科学：综合

CiteScore

6.10

自引率

12.10%

发文量

审稿时长

1.7 months

期刊介绍： Science and Technology of Welding and Joining is an international peer-reviewed journal covering both the basic science and applied technology of welding and joining. Its comprehensive scope encompasses all welding and joining techniques (brazing, soldering, mechanical joining, etc.) and aspects such as characterisation of heat sources, mathematical modelling of transport phenomena, weld pool solidification, phase transformations in weldments, microstructure-property relationships, welding processes, weld sensing, control and automation, neural network applications, and joining of advanced materials, including plastics and composites.