Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Reexamination Certificate
1999-09-14
2001-07-03
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
C137S088000, C137S093000
Reexamination Certificate
active
06253780
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a method for preparing a welding fluid in accordance with the introduction to the main claim. The invention also relates to a plant for preparing and storing said fluid in accordance with the introduction to the relative independent claim.
BACKGROUND OF THE INVENTION
As is well known, a welding fluid usually comprises a mixture of gases. The gases concerned are argon (Ar), helium (He), oxygen (O
2
) and carbon dioxide (CO
2
), the relative mixtures being binary or ternary, for example the mixtures can be:
a) Ar—CO
2
;
b) Ar—CO
2
—O
2
;
c) Ar—He;
d) Ar—He—CO
2
.
These gases are supplied to that region of an article at which the weld is to be made usually already mixed together.
It is known to use cylinders containing the mixture which are directly conveyed to the site at which the weld is to be made. This operation can however create safety problems in the workplace.
A system involving the preparation of welding mixtures on site is used where such mixtures are consumed in large quantity, it then being economically and logistically justified to use liquefied gas storage (Ar and/or CO
2
).
It is also know to prepare such welding mixtures in which the components Ar and CO
2
are stored in the liquid phase (for example in large cryogenic tanks or cold evaporators) and the other components are stored in respective cylinders. The various components are mixed in known manner to obtain the final welding mixture. This known method (and relative plant) does not however ensure a mixture with constant composition characteristics. This negatively affects the execution of the weld, with the result that this latter often does not satisfy the severe codes which generally govern welding operations.
OBJECTS AND SUMMARY OF THE INVENTION
An object of this invention is therefore to provide a method enabling a welding mixture to be obtained, of which the physico-chemical characteristics (relative to the percentage of its components, its delivery pressure and similar parameters) remain constant with time, so ensuring optimum welding to satisfy the most severe codes.
A further object is to provide a method of the aforesaid type which is of reliable implementation and allows continuous delivery of the welding mixture.
A further object is to provide a method of the aforesaid type in which both the manner in which the welding mixture is generated and its composition can be remotely controlled.
Another object of the invention is to provide a plant for safely and reliably implementing the aforesaid method.
These and further objects which will be apparent to an expert of the art are attained by a method and plant for its implementation in accordance with the accompanying claims.
REFERENCES:
patent: 3762428 (1973-10-01), Beck et al.
patent: 5674382 (1997-10-01), Chapman
patent: 536 491 (1993-04-01), None
patent: 623 381 (1994-11-01), None
patent: 2170731 (1986-08-01), None
Cuccoli Giorgio
Di Lauro Dante
Remelli Roberto
Salvoni Marco
Air Liquide Italia, S.R.L.
Hepperle Stephen M.
Steinberg & Raskin, P.C.
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