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Koteswara Rao, S. R.
- Friction Stir Welding of Copper and its Alloys Using Different Tool Pin Profiles
Abstract Views :171 |
PDF Views:2
Authors
Affiliations
1 Madras Institute of Technology, Anna University, Chennai - 600 044, IN
2 DMRL, Hyderabad - 500 058, IN
3 Tagore Engineering College, Chennai - 600 048, IN
1 Madras Institute of Technology, Anna University, Chennai - 600 044, IN
2 DMRL, Hyderabad - 500 058, IN
3 Tagore Engineering College, Chennai - 600 048, IN
Source
Programmable Device Circuits and Systems, Vol 4, No 10 (2012), Pagination: 517-520Abstract
Friction Stir Welding (FSW) is relatively new joining process that is presently attracting considerable interest. The process is solid-state in nature. Copper and Brass are widely used engineering materials in electrical and chemical industry because of their high electrical and thermal conductivity, high corrosion resistance and high strength. The main objective of this work is to investigate the feasibility of Friction Stir Welding (FSW) of copper and brass. FSW trials were carried out on 6 mm thick commercially pure copper and brass plates with travel speeds ranging from 30 to 75 mm/min and tool rotational speeds ranging from 1300 to 1600 rpm. The FSW tool pin was made of high speed steel (M2) hardened and tempered to 55 HRC. Friction stir tool is the key art of friction stir welding processes. The tool pin profile used in this study are straight cylindrical, taper cylindrical, threaded cylindrical and tapered threaded cylindrical with a pin lengths of 5.0 mm to 5.4 mm. Defect free welds were obtained using several sets of parameters. Vickers micro hardness testing and tensile tests were carried out to evaluate the mechanical properties of sound welds. Use of tapered threaded tool and tool rotational speed of 1300 to 1600 rpm resulted in high quality welds with good mechanical properties. Different microstructure zones were revealed by optical microscopy (OM). The Weld Zone (WZ) and Thermo Mechanically Affected Zone (TMAZ). The WZ fine equiaxed grains were observed and TMAZ fine elongated grains were observed.Keywords
Friction Stir Welding (FSW), Dissimilar Welding, Welding of Copper with Brass.
- Occurrence of Fall Armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), in Chittoor District of Andhra Pradesh, India with a Note on Rove Beetle as its Potential Natural Enemy
Abstract Views :314 |
PDF Views:132
Authors
V. Abdul Rasheed
1,
S. R. Koteswara Rao
2,
K. Sreedevi
3,
B. Bhaskar
4,
T. R. Ashika
3,
T. Venkatesan
3,
S. K. Jalali
3
Affiliations
1 Department of Entomology, S.V. Agricultural College, Tirupati - 517 502, Andhra Pradesh, IN
2 Administrative Office, Acharya N. G. Ranga Agricultural University (ANGRAU), Lam, Guntur - 522 034, A. P., IN
3 ICAR-National Bureau of Agricultural Insect Resources (ICAR-NBAIR), H. A. Farm Post, Hebbal, Bellary Road, Bengaluru – 560 024, Karnataka, IN
4 Department of Plant Pathology, S.V. Agricultural College, Tirupati, A. P., IN
1 Department of Entomology, S.V. Agricultural College, Tirupati - 517 502, Andhra Pradesh, IN
2 Administrative Office, Acharya N. G. Ranga Agricultural University (ANGRAU), Lam, Guntur - 522 034, A. P., IN
3 ICAR-National Bureau of Agricultural Insect Resources (ICAR-NBAIR), H. A. Farm Post, Hebbal, Bellary Road, Bengaluru – 560 024, Karnataka, IN
4 Department of Plant Pathology, S.V. Agricultural College, Tirupati, A. P., IN
Source
Journal of Biological Control, Vol 34, No 1 (2020), Pagination: 86-89Abstract
The occurrence of fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) in maize fields of Tirupati region, Andhra Pradesh is herewith reported. Field surveys in maize fields revealed that the rove beetle, Paederus fuscipes Curtis (Coleoptera: Staphylinidae) was found predating the larvae of fall armyworm and this is the first report of P. fuscipes on fall armyworm from India. The species identity of both fall armyworm and the rove beetle was confirmed through molecular studies by amplifying cytochrome oxidase I gene (CO1) and DNA barcoding.
Keywords
Fall Armyworm, Invasive Pest, Maize, Paederus fuscipes, Predator.Full Text
References
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