Indian Welding Journal

S. Prasad ¹, S. R. Jana ¹

Affiliations
1 D and H Secheron Electrodes Pvt. Ltd., Indore, IN

Abstract

As a joining operation, welding plays by far the most important role in the fabrication industry. To keep the rejection rates low, quality of welding has to be of the highest order. The present paper deals with the role of hydrogen in the welding of low alloy steels.

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S. R. Jana ¹

Affiliations
1 D H Secheron Electrodes Pvt. Ltd., Indore, IN

Abstract

A modern dairy is equipped in general with milk reception, processing, storage, and bottling equipment. Besides there may be other specialised plant and equipment such as butter making, cheese making equipment, milk powder plants, and reconstitution plants. Milk reception equipment comprises of items such as milk weighing scale, weigh bowl, dump tank, plate milk cooler, raw milk storage tank etc.

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S. R. Jana ¹

Affiliations
1 D & H Secheron Electrodes Pvt. Ltd., Indore, IN

Abstract

Urea processes impose severe corrosion conditions on the materials used in equipments such as reactors, decomposers, absorbers, etc. Stainless steel of 316L type has been extensively used by various urea processes. Corrosion rates of SS 316L obtained in boiling nitric acid test (Huey Test) closely resembles the rates obtained in urea equipment and hence the test can be considered as fairly representative for practical purposes. Various elements namely C, Si, N, P, S, Cr, Ni, and Mo affect weldability and sensitisation characteristics of weld metal and HAZ. Proper balancing of the elements in the filler metal is a must for successful application. Nitrogen content in weldmetal in the range of 0.1-0.2% has been found to increase the tensile strength of the weld metal without any detriment to the corrosion resistance properties. Extensive tests on 316L (modified) led to this conclusion. Latest research and development work finds 25Cr-22Ni-Mo-N type of steel with higher Mn-content to be superior to 316L (modified). Use of higher nickel steel and Incoloys may have an edge in certain applications.

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S. R. Jana ¹, D. S. Honavar ¹

Affiliations
1 D&H Secheron Electrode Pvt. Ltd., Indore, IN

Abstract

18-8-Mo type of stainless steels have found a wide range of applications in the industry due to their excellent corrosion resistance compatible with techno-economic considerations. They have found particularly wide usage in such important fields as fertilisers, paper, heavy chemicals, drugs and pharmaceuticals, food and beverage, and other industries where their corrosion resistance to acids and chemicals has led to longer service life, freedom from contamination in articles of human consumption, and trouble-free operation of plant and equipment.

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