From: none@none.com99   
      
   On 3/26/2025 8:55 AM, Richard Smith wrote:   
   > Bob La Londe  writes:   
   >   
   >> On 3/25/2025 3:01 PM, Snag wrote:   
   >>> On 3/24/2025 2:13 PM, Bob La Londe wrote:   
   >> ...   
   >>   
   >> Yeah, generally MIG stainless takes tri-mix.   
   >> ...   
   >> Bob La Londe   
   >   
   > Tri-mix - contains helium?   
   > You seem to get / use much more He in the USA.   
   >   
   > I once got to try a mix with He on stainless steel - rubbish welds at   
   > their "house" conditions in "dip".  But when no-one was looking I   
   > flipped it into "spray" and the foreman returning jumped backwards and   
   > his his jaw dropped, and recovering a bit he asked "Did you just do   
   > that?!".  To which I answered "Yes.  Here's the weld you want."   
   >   
   > For most stainless MIG here we use Ar-1%O2.  Never tried it.   
   >   
   >   
      
      
   Yes, He seems to be the proverbial magic sauce in some welding   
   operations.  The USA used to have a HUGE strategic reserve of helium,   
   but I do not know how that stands today.  Helium is still expensive.   
      
   I've heard of O2 in welding, but I always wondering how it worked since   
   O2 is the primary reactive gas in "air" that you shield from with   
   welding gases.   
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
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