Method for defect free keyhole plasma arc welding
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United States of America Patent
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Jul 6, 1993
Grant Date -
N/A
app pub date -
Jul 15, 1992
filing date -
Jul 15, 1992
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Expired
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Abstract
A plasma arc welding process for welding metal of increased thickness with one pass includes operating the plasma arc welding apparatus at a selected plasma gas flow rate, travel speed and arc current, to form a weld having a penetration ratio to weld height to weld width, and maintaining the penetration ratio at less than 0.74. Parameters for the plasma gas flow rate, travel speed and arc current are adjusted to a steady state condition during a start up period and maintained during the steady state condition to complete a weld. During a terminal stopping period, the travel speed is stopped and instantaneously replaced by filler wire which adds material to fill the keyhole that had been formed by the welding process. Parameters are subsequently adjusted during the stopping period to terminate the weld in a sound manner.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- THE BABCOCK & WILCOX COMPANY
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Fisher, Walter J | Ravenna, OH | 1 | 12 |
Harwig, Dennis D | Canton, OH | 4 | 187 |
Hunt, James F | Mt. Vernon, IN | 3 | 43 |
Ryan, Patrick M | Alliance, OH | 15 | 324 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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