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39. Dissimilar joining of stainless steel and aluminum using twin-wire CMT

Author

Haiyan Wang, Yi Yaoyong, Fang Weiping, Wanghui Xu, Huan He, and Yu Chen

Subjects
0209 industrial biotechnology, Materials science, Mechanical Engineering, Metals and Alloys, Intermetallic, 02 engineering and technology, Welding, 020501 mining & metallurgy, law.invention, 020901 industrial engineering & automation, 0205 materials engineering, Mechanics of Materials, law, Ultimate tensile strength, Brazing, Composite material, Layer (electronics), Joint (geology), Groove (music), Tensile testing
Abstract

The twin-wire CMT with Al-Si filler was used as weld/brazing process for dissimilar joining of stainless steel and aluminum. It is shown that this approach can ensure a satisfactory performance of the joint and the dissimilar joint exhibits typical characteristics of common known steel/aluminum weld brazing joints. Intermetallic compounds (IMCs) were detected next to the steel as a layer of Fe2Al5, as a layer of Fe3Al2Si4 adjacent to the aluminum side and as a scattered phase of Fe4Al13 in between. The total thickness of the IMCs was determined with 2–4 μm. The maximum tensile strength of the weld joints without reinforcement was up to 96 MPa and cross tensile test specimens fractured at the brazing interface at about 35% of the strength of the aluminum. An increase of the wire feeding rate and decrease of the welding speed thereby outperform beneficial in respect to wetting characteristics. However, excessive heat input (e.g., wire feeding rate larger than 7.5 m/min) causes a reduction of the mechanical properties. A groove gap about 1 mm ensures furthermore a good back appearance.

Published
2021

40. Lignin Synthesis Related Genes with Potential Significance in the Response of Upland Cotton to Fusarium Wilt Identified by Transcriptome Profiling

Author

Fang Weiping, Qianwen Zhang, Xiaojie Yang, Yuanming Zhao, Jianan Hou, Fu’an Zhao, Wu Li, Lihong Nie, Deyi Xie, Yao Sun, Yajing Zhu, Mengmeng Wang, Tang Zhongjie, Xiaopei Bo, and Shuping Lv

Subjects
Genetics, Phenylpropanoid, food and beverages, Plant Science, Biology, biology.organism_classification, Fusarium wilt, Transcriptome, Metabolic pathway, Gene expression, Fusarium oxysporum, Cultivar, Gene
Abstract

Fusarium wilt, caused by the fungus Fusarium oxysporum Schlecht. f. sp. vasinfectum (Fov) is a destructive soil-borne cotton disease. To profile the genes and pathways responding to Fov infection, we compared transcriptomic responses before and after F. oxysporum inoculation in a highly resistant cotton cultivar, Yumian21, and a highly susceptible cultivar, Jimian11. Although the overall gene expression pattern was downregulated in both cultivars, the global gene expression in the resistant cultivar was stronger than that in the susceptible cultivar. In addition, the expressed genes of two cultivars mostly differed in “cellular process,” “single-organism process,” “metabolic process,” and “response to stimulus” functional groups in the biological process Gene Ontology category: the upregulated differentially expressed genes (DEG) were largely enriched in the resistant cultivar, while the downregulated DEGs were largely enriched in the susceptible cultivar. Phenylpropanoid biosynthesis and phenylalanine metabolism are the key metabolic pathways in cotton in response to Fov. We found that lignin plays a potential role in cotton resistance to Fov. Two coding genes, caffeic acid 3-O-methyltransferase and peroxidase2, as well as the two transcription factors MYB46 and MYB86, are possibly involved in the accumulation and synthesis of lignin. Furthermore, the result showed that the quantification of lignin could be potentially used as a selection tool to identify Fusarium wilt resistant cotton.

Published
2021

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