Method for preventing the discoloration of areas around indentation in spot welding
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United States of America Patent
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-
Aug 20, 1985
Grant Date -
N/A
app pub date -
Mar 30, 1984
filing date -
Apr 4, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for preventing discoloration of the area around an indentation in spot welding is provided in which the weld zone and its surrounding area are masked with a non-oxidizing gas such as argon gas, helium gas, nitrogen gas or a mixture of argon gas and carbon dioxide gas from ambient atmospheric air and spot welding is carried out in the atmosphere of the non-oxidizing gas to prevent the discoloration from occurring at the weld zone of a metal sheet under the influence of heat during spot welding.
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