John: The short answer is yes you can solder Al to Sn/Pb.Reliabilty	
		may be another issue.					
	
		Fluxing is typically done with a reaction style flux at high	
		temperatures(350C).It is made up of metal halides such as Sn	
		or Zn chloride along with ammonium chloride.The heat and 
		chemistry destroy the aluminum oxide film allowing the metals	
		to wet the aluminum.There are also some lower temperature	
		fluxes available but may not do as good a job of activation.	
									
		The aluminum alloy can also influence solderability.Alloys	
		containing >2%magnesium or >5%silicon can be difficult to	
		solder.							
									
		I would contact one of the larger flux suppliers Alpha,Kester	
		Multicore etc.to see what they have available.Whatever flux	
		system you use make sure you THOROUGHLY remove it.Most of 
		this stuff is highly corrosive and conductive		
									
					Regards				
					Michael Barmuta			
					Staff Engineer			
					Fluke Corp.			
					Everett Wa.			
					(206)356-6076

On Thu, 7 Nov 1996 14:43:33 -0800 John Parsons wrote:

> From: John Parsons <[log in to unmask]>
> Date: Thu, 7 Nov 1996 14:43:33 -0800
> Subject: ASSY: Aluminum to Tin/Lead
> To: IPC TechNet <[log in to unmask]>
> 
> We are quoting on a job for which we have been provided very little
> information.  We do know that a 0.030 aluminum wire must be "soldered" to a
> trace on the board.  We are told that the finish "looks" like tin/lead.
> 
> My question,  is it possible to solder an aluminum wire to tin/lead, and if
> "YES" using what type of solder.  If "NO" what is the likely finish on this
> board.
> 
> Thanks
> 
> John 
> 
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