Method of fitting a valve seating ring and an apparatus therefor
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United States of America Patent
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-
Jul 10, 2001
Grant Date -
N/A
app pub date -
May 13, 1999
filing date -
Dec 21, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A welding machine for weld bonding a valve seating ring in an annular recess of a cylinder head (20) includes an electrode tool (14) on which the ring is located and an overhead support (18, 40, 44, 46) for mounting the cylinder head above the tool. In use the electrode tool is moved upwards into the recess while a welding current is passed across the cylinder head and the electrode tool, so that the ring is weld bonded into the recess, without process spatter entering the cylinder head. There can be two separate electrode tools which operate simultaneously on respective recesses although the weld current may be applied sequentially.
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