I've had a bad string of luck lately with band saw blades. I use 3/16" X 4T & 1/4" x 6T blades and, from the last three places I bought, they have failed at the weld within just a few hours of use. These vendors are : SuperCut, Woodcraft Bands and Saw Blade Express. I have to say all but SuperCut were great about exchanging or re-welding the blades free of charge but, the hassle of sending them back, the cost of the postage, the constant downtime of changing the blades on the saw and just the general frustration have taken their toll. Isn't there some place that sells band saw blades with quality welds ?
Further information : Blades break on both an older 14" Delta and a new 14" Rikon. I have adjusted both these saws correctly with proper tension and guide placement. I don't cut curves tighter than what is recommended for the blades. I burnish the back edges of the blades upon installation. I don't feed too aggressively or otherwise stress the blades when cutting.
I forgot to add that I cut 1-3/4" ash with the 1/4" blades and 3/4" maple with the 3/16" blades. Also, as an above-the-reply redirect to Erik, the blades that I have had replaced also have broken at the weld so it's not really one try and done.