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Agrawal, S. K.
- Review on Design and Development of Narrow Gap Welding Torches
Authors
1 Mechanical Engineering Department, School of Technology, Pandit Deendayal Petroleum University, Raisan, Gandhinagar 382 009, IN
2 Fusion Resources, 93/6,Shreeji Ind. Estate, GIDC Makapura, Vadodara, IN
Source
Indian Welding Journal, Vol 45, No 4 (2012), Pagination: 66-76Abstract
Narrow gap welding is an effective process for joining thick plates (2" to 12") of carbon steel, low alloys steel and high strength low alloy steels. But it requires some development in torch design, wire feeding mechanism and welding procedure for preventing all sorts of weld defects before practical application. Narrow gap welding technology is associated with various conventional arc welding technology like GMAW, GTAW, SAW, FCAW&SMAW. Several fabricators world over, especially in Japan have developed their own equipment working on different principles [1]
Standard torches for NGW are not available routinely in the market. Torches for NGW are specially designed (custom made) for various NGW applications. Design of torch will differ from processes to process and application to application. Paper highlights the different torch designs used by researcher for different narrow gap welding technologies like
I) Narrow Gap-Gas Metal Arc Welding (NG-GMAW) Torch Design
II) Narrow Gap-Gas Tungsten Arc Welding (NG-GTAW) Torch Design
III) Narrow Gap- Submerged Arc Welding (NG-SAW) Torch Design.
- Sensitization in Austenitic Stainless Steels During Welding
Authors
1 Metallurgical Engineering Department, M. S. University of Baroda, Baroda-1, IN
Source
Indian Welding Journal, Vol 31, No 2 (1998), Pagination: 18-22Abstract
Austenitic Stainless Steels are characterised by high content of chromium (18-20%) and nickel (8-14%) present in the solution and which impart the characteristic corrosion resistance property to this variety of steel.- Comparative Study of Hot Cracking Susceptibility of AISI 347 Austenitic Stainless Steel (ASS) using Acidic and Basic Coated Filler Material
Authors
1 Metallurgical Engineering Department, The M.S.University of Baroda, IN
2 Fusion Resources, 925/2/8, GIDC Makapura, Vadodara, IN
3 Anup Engineering, Ahmedabad, IN
Source
Indian Welding Journal, Vol 40, No 3 (2007), Pagination: 39-44Abstract
Hot cracking refers to cracking that occurs during welding, casting or hot working at temperatures close to the melting point of the materials. Hot cracking susceptibility of austenitic stainless steel is a problem arising during welding of austenitic stainless steels, particularly in fully austenitic and stabilized compositions. Hot cracking in stainless steel welds is caused by low-melting eutectics containing impurities such as S, P and alloy elements such as Ti, Nb. In stabilized stainless steels, Ti and Nb react with S, N and C to form low melting eutectics. In austenitic stainless steels, segregation plays an overwhelming role in determining cracking susceptibility. Total crack length (TCL), has been used extensively as hot cracking parameter. [1,2]
In the present investigation, an attempt has been made to study hot cracking susceptibility of stabilized ASS on transvarestraint test unit, with acidic and basic coated electrodes.
Experiment, shows that acidic and basic coated electrodes both are more or less equally susceptible to hot.
- Welding of Aluminium-Selection of Filler Metals
Authors
1 Metallurgical Engg., M. S. University of Baroda, Vadodara - 390001, IN
Source
Indian Welding Journal, Vol 39, No 4 (2006), Pagination: 36-42Abstract
Aluminium alloys find wide applications in all kind of industries. Emphasis on lighter vehicles has especially encouraged use of aluminium in transport sector and in automobile industry. Lower density is the prime reason for their preference in this sector but good thermal conductivity is another major consideration some applications. Transport sector accounts for nearly 18% of the total aluminium consumption in India.
- Transvarestraint Testing of Low Ferrite Consumables for Austenitic Stainless Steel Welding
Authors
1 Metallurgical Engineering Department, M, S. University of Baroda, Vadodara, IN