Weldment for austenitic stainless steel and method

Patent · Tue Jan 01 00:00:00 EST 1985

OSTI ID:865697

Bagnall, Christopher ^[1]; McBride, Marvin A ^[1]

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1. Hempfield, PA

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., Pittsburgh, PA (United States)
• DOE Contract Number: AM02-76CH94000
• Assignee: United States of America as represented by Department of Energy (Washington, DC)
• Patent Number(s): US 4558202
• OSTI ID: 865697
• Country of Publication: United States
• Language: English

Related Subjects

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