US2004108025A1PendingUtilityA1

Method for pre-treating a ring support prior to the <alfin> process

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Priority: Jan 30, 2001Filed: Dec 5, 2001Published: Jun 10, 2004
Est. expiryJan 30, 2021(expired)· nominal 20-yr term from priority
Inventors:Ulrich Bischofberger
C23C 2/0222B22D 19/0081B22D 19/0027B23K 35/002C21D 9/40C21D 1/74C21D 1/773
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Claims

Abstract

The aim of the invention is to provide a ring support that is as oxide-free as possible, prior to being cast-in with piston material. To achieve this, the ring support is annealed in a vacuum or in a hydrogen atmosphere once the ring support has been welded to the sheet steel part.

Claims

exact text as granted — not AI-modified
1 . Method for pre-treating ring supports for aluminum pistons prior to the “alfin” process, 
 characterized in that  
 the ring supports are annealed in a vacuum or in a reducing hydrogen atmosphere, at temperatures between 900° C. and 1130° C.  
 
     
     
         2 . Method according to  claim 1 , 
 characterized in that    the annealing takes place over a time period of 5 to 10 minutes.    
     
     
         3 . Method according to  claim 1  or  2 , 
 characterized in that  
 after annealing, a cooling speed of >5 K/min is adjusted, in  
 order to prevent austenite decomposition.

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