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钛合金Ti-6Al-4V电阻点焊的探索性研究

An Exploratory Study on Resistance Spot Welding of Titanium Alloy Ti-6Al-4V.

作者信息

Fatmahardi Ichwan, Mustapha Mazli, Ahmad Azlan, Derman Mohd Nazree, Lenggo Ginta Turnad, Taufiqurrahman Iqbal

机构信息

Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia.

Faculty of Mechanical Engineering Technology, Universiti Malaysia Perlis, Kampus Pauh Putra, Arau 12950, Perlis, Malaysia.

出版信息

Materials (Basel). 2021 Apr 30;14(9):2336. doi: 10.3390/ma14092336.

DOI:10.3390/ma14092336
PMID:33946335
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8124191/
Abstract

Resistance spot welding (RSW) is one of the most effective welding methods for titanium alloys, in particular Ti-6Al-4V. Ti-6Al-4V is one of the most used materials with its good ductility, high strength, weldability, corrosion resistance, and heat resistance. RSW and Ti-6Al-4V materials are often widely used in industrial manufacturing, particularly in automotive and aerospace industries. To understand the phenomenon of resistance spot weld quality, the physical and mechanical properties of Ti-6Al-4V spot weld are essential to be analyzed. In this study, an experiment was conducted using the Taguchi L9 method to find out the optimum level of the weld joint strength. The given optimum level sample was analyzed to study the most significant affecting RSW parameter, the failure mode, the weld nugget microstructure, and hardness values. The high heat input significantly affect the weld nugget temperature to reach and beyond the β-transus temperature. It led to an increase in the weld nugget diameter and the indentation depth. The expulsion appeared in the high heat input and decreased the weld nugget strength. It was caused by the molten material ejection in the fusion zone. The combination of high heat input and rapid air cooling at room temperature generated a martensite microstructure in the fusion zone. It increased the hardness, strength, and brittleness but decreased the ductility.

摘要

电阻点焊（RSW）是钛合金，特别是Ti-6Al-4V最有效的焊接方法之一。Ti-6Al-4V是最常用的材料之一，具有良好的延展性、高强度、可焊性、耐腐蚀性和耐热性。RSW和Ti-6Al-4V材料经常广泛应用于工业制造，特别是在汽车和航空航天工业中。为了了解电阻点焊质量现象，分析Ti-6Al-4V点焊的物理和力学性能至关重要。在本研究中，采用田口L9方法进行实验，以找出焊接接头强度的最佳水平。对给定的最佳水平样本进行分析，以研究影响电阻点焊最显著的参数、失效模式、焊核微观结构和硬度值。高的热输入显著影响焊核温度，使其达到并超过β转变温度。这导致焊核直径和压痕深度增加。在高热输入情况下出现了飞溅，降低了焊核强度。这是由熔合区的熔融材料喷射引起的。高热输入和室温下的快速空气冷却相结合，在熔合区产生了马氏体微观结构。这增加了硬度、强度和脆性，但降低了延展性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ed95/8124191/f11a612ceb81/materials-14-02336-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ed95/8124191/75bbb8ade7fc/materials-14-02336-g006.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ed95/8124191/569a21d2bb96/materials-14-02336-g013a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ed95/8124191/f11a612ceb81/materials-14-02336-g014.jpg

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