Plasma arc welding method and apparatus in which a swirling flow is imparted to a plasma gas to stabilize a plasma arc
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United States of America Patent
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-
Mar 31, 1998
Grant Date -
N/A
app pub date -
Sep 12, 1995
filing date -
Mar 26, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided a plasma arc welding method, characterized in that a portion of a front side workpiece material is heated and melted by a plasma arc to form a molten pool thereat, that the molten pool is held not to fall or drop under a surface tension acting thereto and is brought into contact with a portion of a rear side workpiece material under a pressure which is exerted by the plasma arc and/or a shielding gas, further that the portion of the said rear workpiece material is brought into a molten state by a thermal conduction thereto so that the two workpiece materials may be welded together, and that a swirling flow is imparted to a plasma gas of the plasma arc. There is also provided a plasma welding apparatus for using the above mentioned plasma arc welding method, characterized in that the apparatus comprises: a plasma torch which has a plasma flushing outlet for swirling and flushing a plasma gas of the plasma arc around an electrode therefor.
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