Spot Welding between Aluminum Alloy and Zn Coated Steel by Friction Stirring

Miyagawa, Katashi; Tsubaki, Masami; Yasui, Toshiaki; Fukumoto, Masahiro

doi:10.2207/qjjws.26.131

Cited by 27 publications

(22 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is evidence that the steel sheet coating material (Zn) is displaced into the stir zone, since etching revealed fine bands of material directed upwards from the center of the sheet interface. These zones are related to the dispersion/diffusion of Zn particles thanks to the termomechanical action of the welding tool onto the joint interface in agreement with previous reports (Miyagawa (2008)). Previous works have shown that the most part of the heat input is produced in the contact zone between the top plate and the shoulder of the welding tool (Mishra and Mahoney (2007)).…”

Section: Macro and Microstructural Characterizationsupporting

confidence: 92%

“…It has been proposed that Zn acts as a ''lubricant'' during friction stir lap welding by diffusing into the aluminum sheet and suppressing the melting point of the stirred material so that larger areas can be bonded (Elrefaey et al (2005)). In a further study, Miyagawa et al (2008) noted that the FSW Al joints with Zn coated steel exhibited considerably higher fracture load as compared with those involving uncoated steel.…”

mentioning

confidence: 88%

See 1 more Smart Citation

Effect of pin length on Friction Stir Spot Welding (FSSW) of dissimilar Aluminum-steel joints

Piccini

Svoboda

2015

Procedia Materials Science

View full text Add to dashboard Cite

Friction stir welding (FSW) has produced a great impact in several industries due to the advantages that this process presents. In particular, the automotive industry has developed a variant of the original process, called Friction Stir Spot Welding (FSSW), which has a strong interest related to the welding of aluminum alloys and dissimilar materials in thin sheets. Aluminum-steel welding is an actual challenge, being FSSW an alternative to produce these joints. However, the information available related to the influence of process parameters on the characteristics of aluminum-steel joints is scarce. The aim of this work was to study the effect of the pin length of the welding tool and its penetration depth, during friction stir spot welding (FSSW) of overlaps joints of AA6063 with galvanized low carbon steel. FSSW was done by changing the pins length between 0.65 and 1.5 mm, and also by modifying the tool penetration depth in the welded joints. On the welded spots macro and microstructural characterization was performed, Vickers microhardness profiles were determined and Peel and Cross Tension Tests were also done. The maximum loads increased when the tool penetration depth goes up and the pin length decreased. The fracture mode was, at first, interfacial meanwhile it changed to a circumferential mode when the tool penetration depth increased and the pins length was reduced.

show abstract

Section: Macro and Microstructural Characterizationsupporting

confidence: 92%

mentioning

confidence: 88%

Effect of pin length on Friction Stir Spot Welding (FSSW) of dissimilar Aluminum-steel joints

Piccini

Svoboda

2015

Procedia Materials Science

View full text Add to dashboard Cite

show abstract

“…These works suggested the existence of the plated layer significantly improved their weldability. [8][9][10] The previous reports, however, did not mention the reason why the plate metals could improve the weldability and the behavior of the plated layers during FSW and FSSW operation.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Joint Strength of Friction Stir Spot Welded 6022 Aluminum Alloy Sheets and Plated Steel Sheets

2011

View full text Add to dashboard Cite

Friction stir spot welding (FSSW) was performed for joining of an aluminum alloy sheet to a steel sheet. A 6022 aluminum alloy sheet, a non-plated steel and four kinds of plated steel sheets were prepared. They were plated by pure zinc (GI), zinc alloy (ZAM), Al-Si alloy (AS) and zinc alloy including Fe (GA). The melting temperature of each plated layer was 420, 330, 640 and 880 C. The aluminum alloy sheet was overlapped on the steel sheet. A rotating tool was inserted from the aluminum alloy sheet side and the probe tip was kept at the position of 0.2 mm above the lapped interface for 3 s. Temperature change at the welding interface was measured during FSSW by using thermocouples which were located at the joint interface below the rotating tool. The maximum operating temperature was 430 C. It was found that interface morphology, strength and joining area of the joint varied depending on whether melting temperature of the plate layer was higher or lower than the maximum operating temperature. Large joint strength and joining area were obtained for the steel sheet with the low melting temperature of plated layer. In this case, the original plated layer was removed from the interface during FSSW and aluminum/steel interface with a thin intermediate layer was observed.

show abstract

“…Means of solving these problems have mostly been in the form of technical developments for the improvements in power train efficiency and reductions in body weight [2]. Materials replacement, the substitution of aluminium alloys for steel, is in progress, and there is a need for the establishment of effective techniques for joining steel and aluminium alloys [3][4][5]. In a previous article, we have described the joining of a combination of galvanized steel and aluminium alloy by diffusion welding and elucidated the effect of a zinc insert on the welding characteristics of dissimilar metal welding of steel and aluminium alloy.…”

Section: Introductionmentioning

confidence: 99%

Seal spot welding of steel and aluminium alloy by resistance spot welding: dissimilar metal joining of steel and aluminium alloy by Zn insertion

Miyamoto

Nakagawa

Sugi

et al. 2016

Welding International

View full text Add to dashboard Cite

This research concerns a dissimilar metal joining of steel and aluminium (Al) alloys by means of zinc (Zn) insertion. The authors propose a joining concept for achieving strong bonded joints between Zn-coated steel and Al alloys. A eutectic reaction between Zn in the Zn coating and uniform Al-Fe intermetallic compound (IMC) layer at the joint interface, leading to a strong bonded joint. The ultimate aim of this research was to apply this joining concept in the resistance spot welding process for manufacturing vehicle bodies. As a practical issue characteristic to joints of dissimilar metals, anticorrosion measures against electrochemical corrosion must be undertaken. If there is moisture near a joint interface of dissimilar metals, electrochemical erosion will progress. Therefore, a sealing function that could prevent moisture intrusion is required. By applying the above-mentioned welding process to a set of metals with thermosetting resin spread in between, we realized seal spot welding, which not only prevented moisture intrusion but also retained high tensile strength. In this research, first, a cyclic corrosion test was performed on the seal spot-welded joint of galvanized (GI) steel, a steel grade widely distributed in Japan, and Al alloy was bonded by seal spot welding, and the following topics are discussed. Complete removal of sealant from the joint interface is the key to realizing the high tensile stress joint, because remaining sealant will lead to reduction in tensile strength. Therefore, heat generation at the interface was monitored by measuring electrical current and potential difference between the two electrodes, and a precise temperature control was performed. Moreover, the bonding process was clarified by stepwise analysis of the joint interface using optical microscopy, and a guideline for producing strong joints was proposed. And finally, a TEM observation also confirmed that the interface structure of the seal spot-welded joint was the same as joints without the resin; a thin and uniform Al-Fe IMC layer was formed and a strong metallurgical bonding was achieved.

show abstract

Spot Welding between Aluminum Alloy and Zn Coated Steel by Friction Stirring

Cited by 27 publications

References 6 publications

Effect of pin length on Friction Stir Spot Welding (FSSW) of dissimilar Aluminum-steel joints

Effect of pin length on Friction Stir Spot Welding (FSSW) of dissimilar Aluminum-steel joints

Microstructure and Joint Strength of Friction Stir Spot Welded 6022 Aluminum Alloy Sheets and Plated Steel Sheets

Seal spot welding of steel and aluminium alloy by resistance spot welding: dissimilar metal joining of steel and aluminium alloy by Zn insertion

Contact Info

Product

Resources

About