Tin to Stainless

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I recieve an online newsletter, Practical Welding Letter, from www.welding-advisors.com and they said Tin cant be welded to Stainless, here is the section of the email:Q: How do you weld tin to stainless steel? A: You don't, due to the huge difference in melting point. If you need soldering on stainless you might pre-electroplate the stainless with tin, possibly by duplex coating (first nickel, then tin). Finally you may solder your connection to the plated tin layer.My question is couldnt these two be Friction Stir Welded together or TIG welded?  It would not be simple but could it be done?
Reply:Originally Posted by TiFreakI recieve an online newsletter, Practical Welding Letter, from www.welding-advisors.com and they said Tin cant be welded to Stainless, here is the section of the email:Q: How do you weld tin to stainless steel? A: You don't, due to the huge difference in melting point. If you need soldering on stainless you might pre-electroplate the stainless with tin, possibly by duplex coating (first nickel, then tin). Finally you may solder your connection to the plated tin layer.My question is couldnt these two be Friction Stir Welded together or TIG welded?  It would not be simple but could it be done?
Reply:Do you mean tin as in like 60/40 (tin to lead) solder?Or do you mean old soup  cans?DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:Originally Posted by David RDo you mean tin as in like 60/40 (tin to lead) solder?Or do you mean old soup  cans?David
Reply:I would bet you could tig braze the two together with silicon bronze filler rod.I have tig brazed stainless to several types of brass and bronze this way, and it worked just fine.
Reply:But the melting point on tin is very low, lower than the working temp of the brazing fillers.  That is why it has to be soldered, but stainless doesn't solder very well which is why the intermediate nickel plating/buttering has to be done first.