There is a noticeable "thump" every time the weld passes through the guide rollers, even with a new blade. Gradually the thump gets more intense until the blade breaks. I cut both aluminum and mild steel, occasionally stainless. So far I've used only carbon steel blades, maybe I'll try a bi-metal. I've had my broken blades welded at a local shop and the welds don't look real neat so that could be part of the problem, but I've also broken a few brand-new blades from Grainger. I've played around with blade tension and that doesn't seem to help, use a slow feed rate (1 or 2 on the dial) and tightened the spring to lower the vertical force.
Don, I have a very similar 7x12 bandsaw (Wilton brand) but haven't used it very much because it breaks the blade almost every time I use it. The blade always breaks at the weld. I don't know whether it's just a bad weld, too little tension, too much tension, or what. I don't use any fluid. Any insight?
The Chicom 7x12 bandsaw brands are all very similar. Wiltron brand used to be USA made but like most everything else nowadays... What material are you cutting? What type of blade and tpi? Variable tpi or fixed? What blade speed/feed were you using? The 7x12 doesn't have the largest diameter tires so any blade is going to have a limited lifespan, however I get decent lifespan from the Lenox 4-6tpi bi-metal blade when cutting aluminum. I do cut dry in the vertical mode with a table in place using the Vortec cold air gun with no real problems so I don't believe cutting dry is the issue. Aluminum needs a very coarse blade to properly eject the swarf/chips. Too fine a blade (high tpi) with aluminum could cause blade breakage. Blade tension is also a factor. Blade guide alignment and tire alignment can also be factors.
BTW that is a Cenco lab jack in the vise behind the round. The lab jack allows me to hold really short rounds in the bandsaw vise and get the most from my stock.
I also have one of the little $200 4x6 bandsaws and do almost all of my cutting with it. At least it never breaks blades, although they come loose sometimes!
There should be wee grinder on the blade welder and you should grind the weld flat BEFORE using it. Just needs a touch up either side of the blade to smooth it out so it doesn't jam and break going through the guides.