Indian Welding Journal

G. L. Mukhopadhyay ¹

Affiliations
1 Esab India Ltd, IN

Abstract

The function of shielding gases in GTAW (GAS TUNGSTEN ARC WELDING) and GMAW (GAS METAL ARC WELDING) processes and their applications, alongwith brief introduction have been discussed here to enable the user to critically assess the shielding gas requirements for given application and the key areas the emphasis are to be made for higher productivities.

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G. L. Mukhopadhyay

Abstract

The Indian Industries is at the Cross Road. After many years of protected market and Limited Global Competition, the time has come when all Indian Companies have to stand-up and becounted for inclusion in the New World.

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G. L. Mukhopadhyay

Abstract

Allow me to quote Mr. Advani, Editor of Business India, "How many Indian Companies are technology driven".

Some of my readers may wonder why we need to ask this question! After all, we have the third largest pool of scientific personnel.

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G. L. Mukhopadhyay

Abstract

Let us take a close look at the post budget challenges that are likely to be faced by Indian Industries.

Although several Pandits have raised doubts about the liberalisation package since the Industrial production figures show a relatively low rate of growth and many industries have been destabilished contributing to this lower growth, the fact is that the whole liberalisation process has unshackled industrial creativity.

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S. Ghoshal ¹, G. L. Mukhopadhyay ¹

Affiliations
1 ESAB India Ltd, IN

Abstract

Air-plasma cutting is becoming popular and a practical alternative to oxy-cutting for cutting of mild steel in many fabrication industries. The main advantage lies in the fact that air-plasma cutting is much faster than oxy-cutting. It is therefore expected that it will reduce the cutting cost by accomplishing the cutting much faster. This is unfortunately, not necessarily true. This paper analyses the truth behind this and attempts to identify the conditions which will ensure maximum benefit from air-plasma cutting.

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G. L. Mukhopadhyay ¹

Affiliations
1 KEMPPI OY, Liaison Office, New Delhi 110 048, IN

Abstract

Inverter circuitry has been used for quite sometime in drive systems, battery chargers, aircraft industries, controls and recreation vehicles. With the advent of Solid State Electronics, the high power, reliable, cost effective switching devices were made available which also make the technology adoptable for welding power sources.

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Johann Kubu ¹, G. L. Mukhopadhyay ²

Affiliations
1 Carl Cloos Schweisstechnik GmbH, DE
2 Weld India Consultancy, New Delhi, IN

Abstract

Welding - ELH Eissenbahn Lautwerke GmbH & Co. KG Halle, a well known medium-sized company, supplies bogies to wagon manufacturers for both the domestic and export markets. The longitudinal girders, which are more than 3 metres long and are made of 16mm thick steel plates, are welded on a robot system supplied by Carl Cloos Schweisstechnik GmbH, Haiger Germany. The Tandem high capacity welding process, where two welding wires are melted simultaneously, enables both improved seam quality and considerably higher weld speeds to be achieved.

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G. L. Mukhopadhyay

Abstract

Dear Reader,

At the very outset please accept my apologies for not being able to publish in time the Indian Welding Journal January '95 issue which was mainly due to some unforseen reasons beyond our control. The Central Council had kindly agreed to combine January & April ’95 issue of IWJ.

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G. L. Mukhopadhyay ¹

Affiliations
1 Advani-Oerlikon Limited, Chinchwad, Pune-411 019, IN

Abstract

Gas shielded metal Arc welding had established its persence in • fabricating Industries over many other processes due to its advantages of higher productivities, less cost of welding and ultimately zero defect welding with less dependent on the welders skill. An increasing trend is being observed through out the world in switching over to GMA welding wherever possible from conventional welding. Added to this, the free availabilities of different kinds of Gas mixtures, mainly Argon based mixed Gases and various types of Flux cored wire had increased the process capabilities to suit almost every application that we can think off. Indian Welding Industry has also started adopting GMAW process more and more in order to take the advantages of availabilities related to Inverter based power packages, various Gas mixtures and solid/Flux cored wires of various composition etc.

Keywords

Arc-Gap, Aerosol, Ozone, Pulmonary Oedema, Toxic Fumes.

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