Control device for resistance welder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 12, 2000
Grant Date -
N/A
app pub date -
Mar 29, 1999
filing date -
Feb 3, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a resistance spot welder in which an operation of pressurizing an electrode is conducted by an electric servo motor, an amount of thermal expansion due to production of a weld nugget is detected every moment by reading an encoder which is incorporated in the servo motor. When the detected amount of thermal expansion reaches a preset reference value, it is judged that the weld nugget attains a predetermined strength, thereby stopping a current supply. According to this configuration, a predetermined amount of input heat is ensured, so that an excellent welding quality is surely obtained.
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