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Welding Fixture for Tank Interior

IP.com Disclosure Number: IPCOM000046087D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Ignaffo, TJ: AUTHOR [+2]

Abstract

This fixture can be used to support the heads and shell of a stainless steel tank during welding and then can be removed from the interior of the tank through a small opening.

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Welding Fixture for Tank Interior

This fixture can be used to support the heads and shell of a stainless steel tank during welding and then can be removed from the interior of the tank through a small opening.

The fixture is composed of six copper segments 10 joined together with pivot pins 12. The outer surface of the segments 10 conform to the inner diameter of the head and shell of the tank. An adjusting screw 16 is threaded through the pivot pin 18 so as to provide a fixed force against the pressure block. The force is applied by the screw to each segment 10 to produce a component force against the inner diameter of the head and shell. The purpose of the adjusting screw, mounted on the pivot pin 18, is to allow the screw to be rotated away from the pressure block so as to allow more freedom during removal of the fixture.

Fig. 2 shows a circumferential groove 14 that functions as an argon gas back-fill. The gas is fed to the groove through a gas inlet 15. A flexible tube is connected to a gas supply and to each segment through the gas inlet 15 which provides the required gas flow to maintain the gas back-fill to the underside of the weld seam via the groove.

Fig. 3 shows the pin joint that provides the flexibility. Six segments are shown; however, more or less can be provided to suit conditions. The circular shape was selected to suit the expansion tank geometry; however, other shapes can be accommodated.

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