Influence of zinc on intermetallic compounds formed in friction stir welding of AA5754 aluminium alloy to galvanised ultra-high strength steel

2017 ◽  
Vol 22 (8) ◽  
pp. 673-680 ◽  
Author(s):  
Wallop Ratanathavorn ◽  
Arne Melander
Keyword(s):  
Friction Stir Welding ◽  
Aluminium Alloy ◽  
Intermetallic Compounds ◽  
High Strength Steel ◽  
High Strength ◽  
Friction Stir ◽  
Ultra High Strength Steel

scholarly journals Effect of Shoulder–Workpiece Interference Depth on the Quality of Friction Stir Welding of AA7075-T6 Aluminium Alloy

2019 ◽  
Vol 26 (1) ◽  
pp. 150-159
Author(s):  
Abbas Akram Abbas ◽  
Hazim H. Abdulkadhum
Keyword(s):  
Friction Stir Welding ◽  
Aluminium Alloy ◽  
Welding Process ◽  
High Strength ◽  
Filling Defect ◽  
Welding Quality ◽  
Left Hand ◽  
Friction Stir ◽  
Tool Shoulder ◽  
Welding Surface

The joining of high strength aluminium alloy AA7075-T6 sheets of 3 mm thickness was an attempt utilizing friction stir welding process. The effect of interference depth between tool shoulder and surface workpiece on the welding quality and its effect on the mechanical and metallography properties of welded joints were studied. This process is carried out using a composite tool consists of a concave shoulder made of H13 tool steel and cylindrical left-hand thread with 1mm pitch pin (probe) made of cobalt-based alloy MP159. The dimensions of tools were 14mm shoulder diameter and the pin has 5mm diameter and 2.7mm length. The tool rotation speed and welding speed were 981 rpm 169 mm/min respectively, and the tilt angle was 2°. The range of interference depth between the shoulder and workpiece was selected (0.05, 0.1, 0.15, 0.2, 0.25, and 0.3) mm. various tests were executed to evaluate the welding quality. The results show that lack of filling defect appeared on the welding surface at the interference depth 0.05 mm. An invisible tunnel and lack of penetration in the bottom of the stir zone appeared when the interference depths were 0.1 mm and 0.15 mm. Defect-free welds obtained when interference depths were (0.2, 0.25, and 0.3) mm. The welding efficiency of the defect-free welds was in the range (85.3-92.3%) depending on the ultimate tensile strength of the parent alloy.

Development of friction stir welding of high strength steel sheet

2011 ◽  
Vol 16 (2) ◽  
pp. 181-187 ◽  
Author(s):  
M. Matsushita ◽  
Y. Kitani ◽  
R. Ikeda ◽  
M. Ono ◽  
H. Fujii ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Friction Stir

scholarly journals Systematic Evaluation of the Advantages of Static Shoulder FSW for Joining Aluminium

2014 ◽  
Vol 794-796 ◽  
pp. 407-412 ◽  
Author(s):  
Hao Wu ◽  
Ying Chun Chen ◽  
David Strong ◽  
Philip Prangnell
Keyword(s):  
Friction Stir Welding ◽  
Temperature Distribution ◽  
Aluminium Alloy ◽  
Surface Quality ◽  
Heat Affected Zone ◽  
Heat Input ◽  
High Strength ◽  
Temperature Gradients ◽  
Systematic Evaluation ◽  
Friction Stir

Static Shoulder Friction Stir Welding (SS-FSW) is a modification to conventional FSW that was originally developed to improve the weldability of titanium alloys by reducing through thickness temperature gradients. Surprisingly, to date, there have been no published systematic studies comparing SS-FSW to FSW for aluminium welding. This may be because the high conductivity of aluminium means the heat input produced by the shoulder is thought to be beneficial. In the work presented when welding a high strength 7050 aluminium alloy, even in a relatively thin 6 mm plate, it is shown that SS-FSW has several advantages; including a reduction in the heat input, a massive improvement in surface quality, and a more uniform through thickness temperature distribution, which leads to narrower welds with a reduced heat affected zone width and more homogeneous through thickness properties. The reasons for these benefits are discussed.

Microstructural Characterization and Mechanical Properties in Friction Stir Welding of Aa7075 Aluminium Alloy

2012 ◽  
Vol 622-623 ◽  
pp. 330-334 ◽  
Author(s):  
G. Elatharasan ◽  
V.S. Senthil Kumar
Keyword(s):  
Friction Stir Welding ◽  
Aluminium Alloy ◽  
Welding Speed ◽  
Mechanical Response ◽  
Weight Ratio ◽  
High Strength ◽  
Microstructural Characterization ◽  
Optical Microscope ◽  
Heterogeneous Distribution ◽  
Friction Stir

The heat treatable aluminium alloy AA7075 is used extensively in the aircraft industry because of its high strength to weight ratio and good ductility. In this present study the effect of process parameters on the mechanical and micro-structural properties of AA 7075 joints produced by friction stir welding was analyzed. The two sheets, aligned with perpendicular rolling directions, have been welded successively. The welded sheets have been tested under tension at room temperature in order to analyze the mechanical response with respect to the parent materials. Effects of welding speed and fixed location of base metals on microstructures, hardness distributions, and tensile properties of the welded joints were investigated. Optical microscope and SEM analysis revealed that the stir zone contains a mixed structure and onion ring pattern with a periodic change of grain size as well as a heterogeneous distribution of alloying elements. The maximum tensile strength was achieved for the joint produced at rotation speed of 800rpm and a welding speed of 20 mm/s.

Shear-Clinching of Multi-Element Specimens of Aluminium Alloy and Ultra-High-Strength Steel

2018 ◽  
Vol 767 ◽  
pp. 389-396 ◽  
Author(s):  
Daxin Han ◽  
Réjane Hörhold ◽  
Martin Müller ◽  
Sebastian Wiesenmayer ◽  
Marion Merklein ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Industrial Application ◽  
High Strength Steel ◽  
High Strength ◽  
Material Behaviour ◽  
Entire Sample ◽  
Forming Technology ◽  
Ultra High Strength Steel ◽  
Stage Process ◽  
Joining Process

The newly developed joining-by-forming technology “shear-clinching”, features a potentially single-stage process for joining UHSS without requiring any additional elements. Foundational studies have focused on the functionality of shear-clinching at a one-element sample. To ensure the safety of the industrial application of the shear-clinching technology, an investigation with component-like samples with several joints is required. This paper presents a detailed analysis of the material behaviour during the shear-clinching process with multi-element specimens to evaluate the influence of the neighbouring joints. In order to describe the influence of the neighbouring joints, the deformations resulting from the bending and material displacement are recorded without contact after the joining process: locally around the joining point and globally over the entire sample size. To minimize such bending effects, a tool-sided adaptation is provided. The results show the high potential of shear-clinching joining by UHSS and give further recommendations for future multi-material application.

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