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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.
English (United States)
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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.