Underwater welding

Details Underwater welding Underwater welding

1995-12-29

1998-01-06

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912145, 21912143, 219 72, B23K 1000

Patent

active

057057869

ABSTRACT:
Persistent compressive stresses sufficient to suppress hot cracking, reheat cracking and stress corrosion cracking are developed in welds containing alloys of plural materials by quenching of the weld after onset of solidification but while the weld remains soft or "mushy" at a temperature above the melting point of eutectic alloys which may form. Control of the time of quenching is preferably established during submerged welding by a cup-shaped exclusion fitting which is sized relative to the dimensions of a molten weld pool and the speed of travel of a welding heat source such as a plasma transfer arc torch. The cup-shaped exclusion fitting provides improved protection of the weld and heat source with inert gas supplied thereto while also permitting submerged welding at higher hydrostatic pressures than has heretofore been possible. An improved apparatus for transport of powdered welding materials provides for bleeding off of a portion of a flow of transport gas used to transport the powdered materials and can thus provide a reliable supply of such materials over increased distances and against increased gas pressures without compromising the welding heat source or the quality of the weld.

REFERENCES:
patent: 4039798 (1977-08-01), Lythall et al.
patent: 4172974 (1979-10-01), Shtingelin et al.
patent: 4627990 (1986-12-01), Saga et al.
patent: 4659898 (1987-04-01), Spiegelman et al.
patent: 4745256 (1988-05-01), Shubert

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