Method of welding for exfoliation prevention of stainless steel

Details Method of welding for exfoliation prevention of stainless steel Method of welding for exfoliation prevention of stainless steel

1979-02-09

1980-09-23

Kendall, Ralph S.

Coating processes

Interior of hollow article coating

Metal base

427405, 219 7612, 220 3, 220456, 428685, B23K 904, B21D 5124

Patent

active

042243602

ABSTRACT:
A welding method for stainless steel overlays is disclosed wherein a welded stainless steel overlay is prevented from exfoliating out of an inner surface of a high pressure vessel. Hydrogen exists at a partial pressure of less than 150 kg/cm.sup.2 and a temperature less then 450.degree. C. in the pressure vessel. At least one low alloy steel weld-overlay is preliminarily welded over the inner surface of the pressure vessel. The preliminarily low alloy steel weld-overlay is composed of similar composition to the base metal of the vessel, containing niobium and/or nickel. Thereafter, at least one customary ferritic steel or austenitic steel weld-overlay is welded thereon.

REFERENCES:
patent: 2789049 (1957-04-01), DeLong
patent: 4110514 (1978-08-01), Nicholson

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