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Effect of small tool pin profiles on microstructures and mechanical properties of 6061 aluminum alloy by friction stir welding 被引量:6
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作者 H.I.DAWOOD Kahtan S.MOHAMMED +1 位作者 Azmi RAHMAT M.B.UDAY 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第9期2856-2865,共10页
The effect of small tool pin profiles on the microstructures and mechanical properties of 6061 aluminum alloy joints using friction stir welding (FSW) technique was investigated. Three different tool pin profiles: ... The effect of small tool pin profiles on the microstructures and mechanical properties of 6061 aluminum alloy joints using friction stir welding (FSW) technique was investigated. Three different tool pin profiles: threaded tapered cylindrical (T1), triangular (T2) and square (T3) were used to produce the joints. The results indicate that the weld joints are notably affected by joining with different tool pin profiles. The triangular tool pin profile produces thebest metallurgicaland mechanical weld properties compared with other tool pin profiles. Besides, the lowest tensile strength and microhardness are obtained for the joint friction stir welded with square tool pin profile. It is observed that the smaller tool pin profile and shoulder diameter lead to narrow region of heat affected zone (HAZ) and a desired level of softening. The fracture surface examination shows that the joints are also affected when welding with different types of tool pin profiles. The fracture surface shows that the triangular specimen fails with a ductile fracture mode during the tensile test, while the brittle fracture modes are observed in the joints fabricated with other tool pin profiles (T1 and T3). 展开更多
关键词 friction stir welding small tool pin profile mechanical properties aluminum alloy grain size
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Thermo-mechanical interaction between aluminum alloy and tools with different profiles during friction stir welding 被引量:2
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作者 Min YANG Rui-jun BAO +1 位作者 Xiu-zhong LIU Chao-qun SONG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第3期495-506,共12页
The influence of the tool profiles on the thermo-mechanical interaction between AA6061-T6 workpiece and tool during friction stir welding was investigated. A customized experimental setup was employed to measure the f... The influence of the tool profiles on the thermo-mechanical interaction between AA6061-T6 workpiece and tool during friction stir welding was investigated. A customized experimental setup was employed to measure the feature points temperature and tool spindle torque in the process of FSW. Microstructure and tensile properties of stir zone (SZ) were characterized. Results indicate that the shoulder and pin geometries were responsible for the heat generation, tool torque variation at the plunging stage as well as the cross section contour of SZ, respectively. Finer grains in SZ resulted from flutes on shoulder and grooves on pin. Flat faces on the pin resulted in inhomogeneous grain size. Weld with higher 0.2% yield strength of 173 MPa was obtained by using the cylindrical pin tool while higher elongation weld of 32.0% was produced with triflat threaded pin tool. 展开更多
关键词 friction stir welding tool profile thermal cycle tool spindle torque tensile properties
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Formability analysis of dissimilar tailor welded blanks welded with different tool pin profiles 被引量:1
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作者 Bhanodaya Kiran Babu NADIKUDI M.J.DAVIDSON +1 位作者 Neelakanteswara Rao AKASAPU M.GOVINDARAJU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第6期1787-1793,共7页
An attempt has been made to study the tailor welded blanks (TWBs) made by friction stir welding (FSW) with five different tool pin profiles. The formability of welded blanks was evaluated at constant FSW process p... An attempt has been made to study the tailor welded blanks (TWBs) made by friction stir welding (FSW) with five different tool pin profiles. The formability of welded blanks was evaluated at constant FSW process parameters. It has been found that the welded blanks with square pin profile tool produced better formability properties as compared to other tool pin profiles. It was found that the pulsating action of the square pin profile is said to be the reason for this improvement. A microstructural evaluation performed on the blanks revealed that the stir zone created by taper cylindrical and stepped cylindrical tools was less homogeneous than that of the square tool, resulting in less formability. The limiting dome height (LDH) of square pin profile tool was found to be 14 mm while those of taper cylindrical and stepped cylindrical tools are 12.5 mm and 12.4 mm, respectively. 展开更多
关键词 aluminium alloys tool pin profile tensile testing FORMABILITY microstructure
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Influence of tool pin profile and rotational speed on the formation of friction stir welding zone in AZ31 magnesium alloy 被引量:2
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作者 Dr.S.Ugender 《Journal of Magnesium and Alloys》 SCIE EI CAS 2018年第2期205-213,共9页
In this investigation,the effect of friction stir welding(FSW)parameters such as tool pin profiles,rotational speed and welding speed on the mechanical properties of tensile strength,hardness and impact energy of magn... In this investigation,the effect of friction stir welding(FSW)parameters such as tool pin profiles,rotational speed and welding speed on the mechanical properties of tensile strength,hardness and impact energy of magnesium alloy AZ31 was studied.The experiments were carried out as per Taguchi parametric design concepts and an L9 orthogonal array was used to study the influence of various combinations of process parameters.Statistical optimization technique,ANOVA,was used to determine the optimum levels and to find the significance of each process parameter.The results indicate that rotational speed(RS)and transverse speed(TS)are the most significant factors,followed by tool pin profile(PF),in deciding the mechanical properties of friction stir welded magnesium alloy.In addition,mathematical models were developed to establish relationship between different process variables and mechanical properties. 展开更多
关键词 Friction stir welding tool pin profile Mechanical properties Taguchi orthogonal array Analysis of variance(ANOVA)
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Optimization of process parameters to maximize ultimate tensile strength of friction stir welded dissimilar aluminum alloys using response surface methodology 被引量:6
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作者 R.Palanivel P.Koshy Mathews N.Murugan 《Journal of Central South University》 SCIE EI CAS 2013年第11期2929-2938,共10页
Aluminium alloys generally present low weldability by traditional fusion welding process. Development of the friction stir welding (FSW) has provided an alternative improved way of producing aluminium joints in a fa... Aluminium alloys generally present low weldability by traditional fusion welding process. Development of the friction stir welding (FSW) has provided an alternative improved way of producing aluminium joints in a faster and reliable manner. The quality of a weld joint is stalwartly influenced by process parameter used during welding. An approach to develop a mathematical model was studied for predicting and optimizing the process parameters of dissimilar aluminum alloy (AA6351 T6-AA5083 Hlll)joints by incorporating the FSW process parameters such as tool pin profile, tool rotational speed welding speed and axial force. The effects of the FSW process parameters on the ultimate tensile strength (UTS) of friction welded dissimilar joints were discussed. Optimization was carried out to maximize the UTS using response surface methodology (RSM) and the identified optimum FSW welding parameters were reported. 展开更多
关键词 frictions stir welding dissimilar aluminum alloy tool pin profile design of experiments RSM material flow behavior OPTIMIZATION
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Metallurgical behavior and variation of vibro-acoustic signal during preheating assisted friction stir welding between AA6061-T6 and AA7075-T651 alloys 被引量:2
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作者 Ashu GARG Madhav RATURI Anirban BHATTACHARYA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第8期1610-1620,共11页
The present work investigated the effects of pin profiles(cylindrical and square),pin eccentricity(0.5 mm and 1 mm)in cylindrical tool and preheating(secondary heating)on metallurgical behavior,variation of vibro-acou... The present work investigated the effects of pin profiles(cylindrical and square),pin eccentricity(0.5 mm and 1 mm)in cylindrical tool and preheating(secondary heating)on metallurgical behavior,variation of vibro-acoustic signal pattern and joint strength during friction stir welding(FSW)between AA6061-T6 and AA7075-T651 alloys.The eccentric tool pins were observed to provide good flowability and intermixing between dissimilar metals,increased the size of stir zone,and the grains in stir zone were sufficiently finer with eccentric tool pin than concentric pin.The magnitude of vibro-acoustic signal increased when shoulder plunging started and drop in signal was noted when the tool shoulder reached its desired depth.The signal magnitude was noted to be higher in welding stage compared to tool plunging stage as the tool took in fresh material during tool movement along the weld path.Preheating the workpiece prior to pin plunging and during welding notably influenced the flow behavior and mixing pattern,and the grains in stir zone were slightly coarser than those in specimen without preheating.Significant reduction in the magnitude of the signal was also observed after preheating.Tensile and flexural strength of joints were also improved slightly when additional heating was employed. 展开更多
关键词 friction stir welding tool pin profile ECCENTRICITY PREHEATING vibro-acoustic signal microstructure strength
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