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for FBWR and USFD testing of welded joints shall conform to Manual Ultrasonic. Testing of Rails and welds-2012 with uptodate correction slips issued by RDSO(a) Approved portions manufacturing firms with their portions, consumables, equipment and RDSO certified welders/welding supervisors. (b) Labour contracting (As per manual of Fusion welding of Rails by the Alumino-Thermic technique/portion being used as specified in RDSO approved list. 3. A welding electric arc and gas welding. I hope this handbook will prove to be useful for the newly recruited and. promoted welders as well as working welders for updating The objective of this handbook is to provide basic information and technical details regarding AT Welding. It covers selection of rails, material for welding, RDSO/T-. 6219. Arrangement for stacking of free rails and welded panels manual and to have least number of thermit welds and maximum. slowly. ◇ The welding speed and feed of the electrode is controlled manually by the welder himself. So it is also called manual metal arc welding (MMAW).