Effect of weld parameters on joint quality in friction stir welding of Mg alloy to DP steel dissimilar materials

Friction stir welding of dissimilar formed Mg alloys(AZ31/AZ91) was successfully carried out at the limited welding conditions. In a sound joint, SZ was mainly consisted of AZ31 Mg alloy which was located the retreating side. Dynamic recrystallization and grain growth occurred and β intermetallic compounds of AZ 91 Mg alloy was not observed in SZ. BM had a higher hardness than that of the weld zone. The fracture location was not weld zone but BM of the AZ91 Mg alloy in tensile test.

Download Full-text

Influence of Friction Stir Welding Process on the Weld Formation and Tensile Strength of Titanium and Aluminum Dissimilar Alloys Welded Joint

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.3266 ◽

2011 ◽

Vol 189-193 ◽

pp. 3266-3269 ◽

Cited By ~ 1

Author(s):

Yu Hua Chen ◽

Peng Wei ◽

Quan Ni ◽

Li Ming Ke

Keyword(s):

Tensile Strength ◽

Friction Stir Welding ◽

Cross Section ◽

Welded Joint ◽

Welding Process ◽

Dissimilar Materials ◽

Influence Of Process Parameters ◽

Friction Stir ◽

Dissimilar Alloys ◽

Titanium Aluminum

Titanium alloy TC1 and Aluminum alloy LF6 were jointed by friction stir welding (FSW), and the influence of process parameters on formation of weld surface, cross-section morphology and tensile strength were studied. The results show that, Titanium and Aluminum dissimilar alloy is difficult to be joined by FSW, and some defects such as cracks and grooves are easy to occur. When the rotational speed of stir head(n) is 750r/min and 950r/min, the welding speed(v) is 118mm/min or 150mm/min, a good formation of weld surface can be obtained, but the bonding of titanium/aluminum interface in the cross-section of weld joint is bad when n is 750r/min which results in a low strength joint. When n is 950r/min and v is 118mm/min，the strength of the FSW joint of Titanium/Aluminum dissimilar materials is 131MPa which is the highest．

Download Full-text

Strength Characteristics of Steel/Aluminum Alloy Dissimilar Materials Thin Sheets Followed by Friction Stir Welding and Rolling

The Proceedings of Conference of Hokuriku-Shinetsu Branch ◽

10.1299/jsmehs.2021.58.a034 ◽

2021 ◽

Vol 2021.58 (0) ◽

pp. A034

Author(s):

Towa MAEDA ◽

Yukio MIYASHITA ◽

Hisashi HORI

Keyword(s):

Aluminum Alloy ◽

Friction Stir Welding ◽

Dissimilar Materials ◽

Strength Characteristics ◽

Thin Sheets ◽

Friction Stir

Download Full-text

Analysis of the influence of position of welding materials on the FSW seams properties for three dissimilar aluminium alloy

MATEC Web of Conferences ◽

10.1051/matecconf/201817803003 ◽

2018 ◽

Vol 178 ◽

pp. 03003 ◽

Cited By ~ 1

Author(s):

Ana Bosneag ◽

Marius Adrian Constantin ◽

Eduard Niţu ◽

Monica Iordache

Keyword(s):

Friction Stir Welding ◽

Aluminium Alloy ◽

Process Parameters ◽

Arc Welding ◽

Welding Process ◽

Dissimilar Materials ◽

Workpiece Material ◽

Friction Stir ◽

Welding Joints ◽

Welding Materials

Friction Stir Welding, abbreviated FSW is a new and innovative welding process. This welding process is increasingly required, more than traditional arc welding, in industrial environment such us: aeronautics, shipbuilding, aerospace, automotive, railways, general fabrication, nuclear, military, robotics and computers. FSW, more than traditional arc welding, have a lot of advantages, such us the following: it uses a non-consumable tool, realise the welding process without melting the workpiece material, can be realised in all positions (no weld pool), results of good mechanical properties, can use dissimilar materials and have a low environmental impact. This paper presents the results of experimental investigation of friction stir welding joints to three dissimilar aluminium alloy AA2024, AA6061 and AA7075. For experimenting the value of the input process parameters, the rotation speed and advancing speed were kept the same and the position of plates was variable. The exit date recorded in the time of process and after this, will be compared between them and the influence of position of plate will be identified on the welding seams properties and the best position of plates for this process parameters and materials.

Download Full-text

Superplastic Behavior and Microstructure of Titanium (Ti-6Al-4V) Friction Stir Welds Made under a Variety of Processing Conditions

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.433.169 ◽

2010 ◽

Vol 433 ◽

pp. 169-176 ◽

Cited By ~ 5

Author(s):

Paul Edwards ◽

Mamidala Ramulu ◽

Daniel G. Sanders

Keyword(s):

Friction Stir Welding ◽

Base Material ◽

Superplastic Forming ◽

Spindle Speed ◽

Processing Conditions ◽

Superplastic Behavior ◽

Friction Stir ◽

Fine Grained ◽

Weld Parameters

Friction Stir Welding of Ti-6Al-4V was performed on 5 mm thickness plate in order to assess the affect of welding conditions on the resulting microstructure and superplastic forming behavior of the joints. A variety of welding conditions were tested and all welds were subsequently Superplastically formed. It was found that the weld parameters do influence the microstructure and degree of superplastic performance of the joints. Spindle speed was found to have the most dominant affect on the resulting microstructure and superplastic forming behavior. Low spindle speed welds lead to fine grained microstructures and highly superplastic welds, relative to the base material, while high spindle speed welds larger grained microstructures and less superplastic welds.

Download Full-text

Enhancements on dissimilar friction stir welding between AZ31 and SPHC mild steel with Al-Mg as powder additives

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4049745 ◽

2021 ◽

pp. 1-22

Author(s):

Mohd Ridha Muhamad ◽

Sufian Raja ◽

Mohd Fadzil Jamaludin ◽

Farazila Yusof ◽

Yoshiaki Morisada ◽

...

Keyword(s):

Tensile Strength ◽

Friction Stir Welding ◽

Mild Steel ◽

Welding Speed ◽

Welded Joint ◽

Microstructural Analysis ◽

Welding Process ◽

Dissimilar Materials ◽

Friction Stir ◽

Welding Interface

Abstract Dissimilar materials joining between AZ31 magnesium alloy and SPHC mild steel with Al-Mg powder additives were successfully produced by friction stir welding process. Al-Mg powder additives were set in a gap between AZ31 and SPHC specimen's butt prior to welding. The experiments were performed for different weight percentages of Al-Mg powder additives at welding speeds of 25 mm/min, 50 mm/min and 100 mm/min with a constant tool rotational speed of 500 rpm. The effect of powder additives and welding speed on tensile strength, microhardness, characterization across welding interface and fracture morphology were investigated. Tensile test results showed significant enhancement of tensile strength of 150 MPa for 10% Al and Mg (balance) powder additives welded joint as compared to the tensile strength of 125 MPa obtained for welded joint without powder additives. The loss of aluminium in the alloy is compensated by Al-Mg powder addition during welding under a suitable heat input condition identified by varying welding speeds. Microstructural analysis revealed that the Al-Mg powder was well mixed and dispersed at the interface of the joint at a welding speed of 50 mm/min. Intermetallic compound detected in the welding interface contributed to the welding strength.

Download Full-text