Mehta Sanghvi & Company

This assembly is designed for welding vessels fi tted with an inspection chamber and in the stated range of sizes. The vessel must be placed on turning rolls, and the legs on the column are adjustable so that the tool can be used for more than one size of vessel. The gas drag is held between the 11 o’clock and 1 o’clock positions by a balance weight when the vessel turns. The setting-up time is about 5-10 minutes, and the tool can be dismantled and removed through inspection chambers of 350 mm ϕ or more. The vessel must be circular ± 30 mm and suitable for TIGwelding. There is a special Schnorrer water-cooled gas-drag for plasma welding.

Gas purge equipment for use when welding special metals and alloys, in particular stainless steel, titanium, Duplex, and super duplex. when welding this special material it is essential that the welding process takes place in an inert atmosphere in order to prevent oxidation, and this inert atmosphere is often best achieved in a welding chamber. Depending on the material or exotic alloy to be welded, the residual oxygen in the welding chamber may need to be reduced to less than 50 PPM to obtain a corrosion resistance result. Oxidation develops through contact with oxygen when the material is heated to welding temperature. After welding has ended it is important to maintain the inert atmosphere until the temperature of the work-piece is below 250 degrees C, depending on the material.

Our advanced gas purge systems are under continuous development to meet many demanding technical specifications and functional needs and to meet these needs economically.