Evaluation of microstructure and mechanical behavior of Aluminum 2024 and Stainless steel 304 GTAW joints

MATEC Web of Conferences Pub Date : 2023-01-01 DOI:10.1051/matecconf/202338102007

Asad Ali, Muhammad Jawad, M. Jahanzaib

引用次数: 0

Abstract

This study aims to evaluate the microstructure and mechanical behavior of aluminum 2024 and stainless steel 304 dissimilar joints. The gas tungsten arc welding (GTAW) process has been employed to weld base metals by inserting copper-nickel-based (Cu-10%Ni) filler metal. The effects of GTAW parameters such as welding current, welding speed, and gas flow on microstructure and tensile strength have been analyzed through the Taguchi method. Results revealed that tensile strength is primarily influenced by welding current, followed by speed and gas flow rate. The excellent joint strength of 138 MPa has been achieved by using Cu-10%Ni filler metal. The optimal combination of parameters, i.e., welding current of level 2 (80 A), welding speed of level 1 (100 mm/min), and gas flow rate of level 3 (10 l/min), has been obtained through SN ratio optimization. Microstructure and EDS analysis depicted that the weld zone of a high-strength joint contained fine dendrites and CuAl and NiAl solid solutions, while the weld zone of a low-strength joint featured coarse dendrites and brittle FeAl phases.

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铝合金2024与不锈钢304 GTAW接头组织与力学性能评价

研究了铝合金2024和不锈钢304异种接头的显微组织和力学性能。通过插入铜镍基(Cu-10%Ni)填充金属，采用钨极气体保护焊(GTAW)焊接母材。通过田口法分析了焊接电流、焊接速度、气体流量等GTAW参数对组织和抗拉强度的影响。结果表明，焊接电流对拉伸强度的影响最大，其次是焊接速度和气体流量。采用Cu-10%Ni填充金属，接头强度达到了138mpa。通过SN比优化得到了2级焊接电流(80 A)、1级焊接速度(100 mm/min)、3级气体流量(10 l/min)的最优参数组合。显微组织和能谱分析表明，高强度接头焊缝区含有细小枝晶和CuAl、NiAl固溶体，而低强度接头焊缝区含有粗枝晶和脆性FeAl相。

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

MATEC Web of Conferences

自引率

0.00%

发文量

342

审稿时长

6 weeks

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