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G. Padmanabham ¹, B. Shanmugarajan ², K. V. Phani Prabhakar ¹

Affiliations
1 International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur P.O., Hyderabad – 500 005, Andhra Pradesh, IN
2 Welding Research Institute, Bharat Heavy Electricals Ltd, Tiruchhirappalli, Tamilnadu, IN

Abstract

Laser hybrid welding combines the deep penetration capability of laser beam and edge gap bridging capability of an arc welding process such as MIG/MAG. In the present work, a 3.5 kW slab CO₂ LASER -MIG hybrid welding system was used to carry our laser hybrid welding studies with an aim to achieve butt welds of 12mm thick mild steel plates in single pass. Bead-on-plate studies were carried out to first understand the effect of parameters such as laser power, focal plane position of the laser, MIG wire feed rate, composition of shielding gas, distance between laser and MIG arc on the weld penetration. The optimized parameters were then applied on butt welds with Y-groove edge preparation with varying ischolar_main face height and groove angle to identify suitable joint design. Combining the results of bead-on-plate experiments and butt welding experiments, welding of 12 mm thick mild steel plates in single pass could be achieved. The LASER-MIG hybrid butt welds so fabricated showed 100% joint efficiency and high bend ductility.

Keywords

LASER Hybrid Welding, 12 mm Thick Mild Steel Plate, Single Pass Weld.

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Sanjay Bhardwaj ¹, G. Padmanabham ¹, Karuna Jain ², D. Srinivasa Rao ¹, Shrikant V. Joshi ³

Affiliations
1 International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad-500005, Telangana, IN
2 National Institute of Industrial Engineering (NITIE), Mumbai-400087, IN
3 Department of Engineering Science, University West Sweden, SE

Abstract

This study is aimed at developing insights into the Technology Value Chain (TVC) of advanced materials based technologies using a scenario in which technology has been transferred by a Research and Technology Organization (RTO) to a Small and Medium Enterprise (SME) in the Indian context. A Conceptual Theoretical Model (CTM) using constructs from existing TVC models is used as a basis for the case study described in this paper. This model is refined using actual evidence from an Indian RTO-the International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad. The TVC of ARCI’s proprietary Detonation Spray Coating (DSC) technology is used to expand upon the CTM as well as to provide new insights wherever possible. The TVC adopted for DSC includes technology incubation and proof of concept in advance of transferring the technology. These strategies, aided by government funding of the technology recipient companies, were observed to play an important role in successful commercialization.

Keywords

Technology Commercialization, Technology Value Chain, Advanced Materials Technologies, Detonation Spray Coating.

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G. Padmanabham ¹, Sunil Pandey ²

Affiliations
1 Department of Science & Technology, New Delhi, IN
2 Indian Institute of Technology, New Delhi, IN

Abstract

Fusion Characteristics of High Strength Heat-treatable Aluminium-Lithium Alloy Plates, Using GMAW Process in Continuous and Pulsed Mode Were Studied. Burn-off Characteristic of the 1.6mm Diameter 2319-filler Wire in Continuous and Pulsed Mode. Including Relation Between Pulse Current and Pulse Duration for one Droplet Detachment Per Pulse was Determined.

Keywords

Al-Li Alloy, Pulsed-GMAW, Bead Geometry, Aluminium Welding.

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Sunil Pandey ¹, Narinder Mohan ², G. Padmanabham ³, Masood Aghakhani ⁴

Affiliations
1 Dept. of Mechanical Engineering, Indian Institute of Technology, Delhi, IN
2 Dept. of Mechanical Engineering, SBCET, Phirozpur, Punjab, IN
3 International Division, DST, New Delhi, IN
4 Dept. of Mechanical Engineering, Raazi Engineering College, Kermaanshah, IR

Abstract

A relationship between welding current and various welding parameters has been proposed. The relationship can be used to predict welding current and melting rates in submerged arc welding process. Two-level half-fractional factorial design was used to investigate and quantify the direct and interaction effects of four process parameters on welding current in SAW of mild steel.

Wire feed rate, open circuit voltage, welding speed and plate thickness were taken as the welding parameters to investigate the main and interaction effects on the welding current. A model has been proposed for predicting the welding current in submerged arc welding. The adequacy of the model was tested by the use of analysis of variance technique and the significance of the coefficients was tested by the student’s ‘t’ test. The estimated and observed values of the weakling current have been compared through a scatter diagram. The main and interaction effects of different parameters involved have been presented in graphical form.

Keywords

Submerged Arc Welding, Welding Current, Melting Rates, Process Parameters, Modelling.

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