Indian Welding Journal

C. Karthikeyan ¹, V. Anbazhagan ¹, K. G. K. Murti ¹, M. N. Chandrasekharaiah ¹, V. G. Jagannath ²

Affiliations
1 The Welding Research Institute, BHEL, Tiruchirapalli - 620 020, IN
2 The Welding Research Institute, BHEL, Tiruchirapalli - 620 020, IN

Abstract

Laser Matrial Processing technology has deeply penetrated into various industrial applications since 1966(1) when the first industrial CO₂ Laser was built. Since then the versatility and importance of Laser in material processing has been gaining recognition and acceptance with the result that many industries in the developed countries utilise Laser systems. This has encouraged further investigations into the improvement processing methods using Laser to overcome the presently confronted difficulties.

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C. Karthikeyan ¹, K. G. K. Murti ¹, V. Anbazhagan ¹

Affiliations
1 Welding Research Institute, BHEL, Tiruchirapalli - 14, IN

Abstract

Laser material processing technology has started taking deep ischolar_mains in our country and no more it is a mystery. Though the technology started penetrating in our country for nuclear applications, no doubt, it has deepened into other industrial sectors like defence, transport, electronics, space, energy, etc.

Welding Research Institute (WRI) has a 575 Watts capacity CO₂ Laser supplied by M/s. Coherent, USA. In WRI, the following laser material processing feasibility investigations were carried out for the applications of

• Laser welding of battery can hermetic sealing,

• Laser welding of stainless steel spindle assembly,

• Laser cutting of silicon wafers,

• Laser scribing of silicon steel transformer laminations, and

• Laser scribing of solar cells.

The details of the investigations are brought out in this paper, which will give more explanations about the advantages of Laser material processing compared to conventional material processing techniques. A comparison of performance between Laser and EBW is brought out in the paper for the benefit of the readers.

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V. Anandkumar ¹, E. Venkatesan ¹, Baldev Raj ¹, C. Karthikeyan ², R. S. Babu ²

Affiliations
1 Indira Gandhi Centre for Atomic Research, Kalpakkam, IN
2 The Welding Research Institute, BHEL, Tiruchirapalli, IN

Abstract

Steam generators are critical components for the Prototype fast Breeder Reactor being designed at the Indira Gandhi Centre for Atomic Research, Kalpakkam. A leak in the steam generators can have serious consequences leading to rupture of steam generator tubes. Consequently, by introducing a known leak in the experimental loop, data is required to be generated which can predict the response of the material to the leak as a function of leak rate, time, temperature, steam pressure and the size of the microhole as a result of sodium water reaction.

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