Weldment for austenitic stainless steel and method

Patent · 31 December 1984

OSTI ID:865697

Bagnall, Christopher; McBride, Marvin A.

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.

• Research Organization: Westinghouse Electric Corp., Madison, PA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AM02-76CH94000
• Assignee: United States of America as represented by U.S. Department of Energy (Washington, DC)
• Patent Number(s): 4,558,202
• Application Number: 06/523,992
• OSTI ID: 865697
• Country of Publication: United States
• Language: English

Related Subjects

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austenitic
austenitic stainless
austenitic steel
below
causes
comprising
defect-free
defects
delta
delta ferrite
display
eliminates
especially
especially useful
ferrite
foil-like
formed
gas
gas tungsten
iron
iron-rich
joined
joining
melted
melting
mers
method
minor
minor proportion
nugget
occur
otherwise
placed
portions
prior
projecting
proportion
proximate
relatively
relatively rich
results
rich
solidification
solidified
solidus
stainless
stainless steel
steel
substantial
temperature
tungsten-arc
useful
weld
weld nugget
welding
weldment
welds