[MW:26525] duplex contamination

dear expert ;

we have a duplex line connected to pump , the support of thisline is
in carbon steel , for alignement we put a stainless steel shim plate
between support and piping the shim plate is welded to support with
good filler metal ( stainless steel - carbon steel ).

My question is : the duplex will be contaminated or no ?

regards 

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