Electric heating – Metal heating – Nonatmospheric environment at hot spot
Patent
1994-10-20
1996-01-16
Shaw, Clifford C.
Electric heating
Metal heating
Nonatmospheric environment at hot spot
219 61, 228219, B23K 916
Patent
active
054849730
ABSTRACT:
A weld shield apparatus provides an atmosphere of inert gas within a conduit in an underbead region where an external weld joint is to be produced. The weld shield apparatus includes a diffuser structure having a convex exterior surface that is defined by a wall structure, the convex exterior surface is shaped to fit within the conduit and to be separated from an inner wall of the conduit by a clearance space. The diffuser wall structure is comprised of a porous material which enables gas communication between an inlet to the diffuser and the convex exterior surface. A seal is positioned immediately upstream from the diffuser structure and is positioned to engage the inner walls of the conduit so as to prevent the passage of gas in an upstream direction. A source of gas is coupled to the inlet to the diffuser structure and enables inert gas to pass through the porous material and to flow in a laminar manner, via the clearance space, past the underbead region and into the downstream region of the conduit. The resulting laminar flow and use of a neutral density gas enable small amounts of gas to be employed as a weld shield.
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Ktorides Stanley
Praxair Technology Inc.
Shaw Clifford C.
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