Electric heating – Metal heating – By arc
Patent
1983-08-17
1985-12-10
Envall, Jr., Roy N.
Electric heating
Metal heating
By arc
219118, 22826315, 428685, B23K 923
Patent
active
045582025
ABSTRACT:
For making defect-free welds for joining two austenitic stainless steel mers, using gas tungsten-arc welding, a thin foil-like iron member is placed between the two steel members to be joined, prior to making the weld, with the foil-like iron member having a higher melting point than the stainless steel members. When the weld is formed, there results a weld nugget comprising melted and then solidified portions of the joined members with small portions of the foil-like iron member projecting into the solidified weld nugget. The portions of the weld nugget proximate the small portions of the foil-like iron member which project into the weld nugget are relatively rich in iron. This causes these iron-rich nugget portions to display substantial delta ferrite during solidification of the weld nugget which eliminates weld defects which could otherwise occur. This is especially useful for joining austenitic steel members which, when just below the solidus temperature, include at most only a very minor proportion of delta ferrite.
REFERENCES:
patent: 2638665 (1953-05-01), Viles
patent: 2908801 (1959-10-01), Cresswell
patent: 3466418 (1969-09-01), Webb
patent: 3785787 (1974-01-01), Yokota et al.
patent: 4390777 (1983-06-01), Thomas et al.
Bagnall Christopher
McBride Marvin A.
Envall Jr. Roy N.
Fisher Robert J.
Hightower Judson R.
Sigda Catherine M.
The United States of America as represented by the Department of
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