| 摘要 |
A method and apparatus for in situ refurbishment of valve seats are disclosed in which a worn valve seat is initially ground to a flat surface, a buildup of weld metal is deposited on the flat surface, and the weld buildup is machined to the final dimensions of the valve seat. The apparatus comprises a machining apparatus for machining and machining of the valve seat, a gas metal arc welding apparatus for deposition of weld metal, and support structures to support the weld buildup as it is being formed. Preferably, the support structures are in the form of metal chill blocks which act both to support the buildup of weld metal and to act as heat sinks and remove excess heat from the buildup, resulting in a higher quality buildup of metal.
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