I became acquainted with the mig silicon br*** through my job (autobody). We used to use oxy/acet brazing in the old days before mig came into wide spread use. Now because of increasing use of ultra high strength steels containg boron, mig welding them with even the strongest wire is not allowed. It must be spot welded with special spot welders designed to weld that kind of steel. Or, in places where access is unavailable to both sides of the metal, silicon/bronze mug welding is acceptable. We were taught this process and used a Prospot pulsed mig. 100% argon. The one thing that really helped, was making sure to go beyond the metal edge, and a rather long stickout of the wire. This allowed a rather large ball of molten br*** to form and then easily flow between the panels. And when I say a long stick out, I mean one or two inches. When we had it right, taking and putting two coupons together with a root gap in a **** weld, there would be an equal amount of excess br*** on both the front and back sides. Again, I don't claim to be an expert, and this was a pulsed mig, so I don't know how it would work for your particular equipment, but that's how it worked well in my case.
The Jalopy Journal
