T-FSW of Dissimilar Aerospace Grade Aluminium Alloys: Influence of Second Pass on Weld Defects

Metals

Mohammed Alkahtani¹  MustufaHaider Abidi¹  AteekhUr Rehman²  Dhruv Bajaj³  ArshadNoor Siddiquee³  Nabeel Ali³  Hashmatullah Ibrahimi³  Saquib Anjum³ 

[1] Advanced Manufacturing Institute, King Saud University, Riyadh 11421, Saudi Arabia;Department of Industrial Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia;Department of Mechanical Engineering, Jamia Millia Islamia, New Delhi 110025, India;

关键词: friction stir welding;    T joints;    second pass;    defects;    light alloys;    AA2024;   

DOI  :  10.3390/met10040525

来源: DOAJ

【 摘 要 】

The restoration of numerous aircraft structures is achievable with effective repair of welded joints. T-joints are often utilized in these structures to provide structural stability, keeping minimal body weight. Multi-pass friction stir welding (FSW) has proved to be useful for improving the quality of aluminium alloy welds employed in the aerospace sector. However, FSW of these alloys in T-configuration has not been sufficiently addressed yet. Even rarer is the discussion of efficacy of second FSW pass, with altered process parameters for improving the weld quality in T-joints. Hence, two commonly used aerospace grade aluminium alloys, namely, AA2024 and AA7075, were friction stir welded in T-configuration, varying three process parameters, i.e., tool rotational speed, welding speed and shoulder diameter. The effect of second FSW pass, performed at an optimum set of parameters, on kissing bond and tunnelling defect was studied in detail. A substantial reduction in the detrimental effect of these weld defects was discussed via tensile testing, micro-hardness and micro-structural observations.

【 授权许可】

Unknown