Diamond blades do not really cut; they grind. Synthetic diamond crystals embedded in a metal segment scratch and fracture concrete, stone and tile at micro scale, and the segment's metal matrix slowly wears away to expose fresh diamond. This simple working principle explains almost everything a buyer needs to know about diamond blade construction, and why the manufacturing method attaching the segment to the steel core is a safety decision, not just a cost decision.
Anatomy of a Diamond Blade
Every diamond blade has two parts. The steel core is a heat-treated, ground and tensioned disc that carries the segments and defines the blade's flatness at operating speed. The segments are sintered bodies of synthetic diamond grit mixed with metal powders, typically cobalt, iron, copper or tungsten carbide blends. Diamond content, grit size (rated in mesh, where higher numbers mean finer grit) and bond formulation together determine cutting speed, life and finish.
Three Ways to Attach a Segment
Wholly sintered blades are formed in a single mold: steel core, bond and diamond are sintered together at high temperature. The process is economical and suits small diameters, typically up to about 400 mm, for tile saws, angle grinders and light-duty cutting. The trade-off is structural: the core cannot be quenched and heat-treated separately, so core strength and cutting efficiency under heavy load are lower than in segmented designs.
Silver-brazed blades have segments bonded to the core with a silver solder melted by torch or induction. Brazing is cost-effective and reliable, and it allows a properly heat-treated core. The critical limitation is heat: the solder softens at the temperatures generated by prolonged dry cutting. Silver-brazed blades are therefore recommended for wet cutting only. Running a brazed blade dry risks segment detachment, which is a serious hazard, and this is a point distributors should communicate clearly on packaging and in training materials.
Laser-welded blades fuse segment and core with a high-power laser, creating a metallurgical joint strong enough to survive extreme segment temperatures without additional solder. This is what makes laser welding the professional standard for dry cutting, deep cuts in reinforced concrete and high-horsepower floor saws. Even laser-welded blades benefit from water on very hard or abrasive materials, but the weld itself will not let go when a job runs dry. For exporters and distributors, laser-welded lines command the professional tier of the market precisely because their safety case is defensible.
The Bond Rule: Opposites Attract
Within the segment, bond hardness controls how the blade self-sharpens. A soft bond, built on bronze and copper alloys, wears away quickly and keeps exposing fresh diamond; it is the correct choice for hard, dense, less abrasive materials like granite, porcelain and hard concrete. A hard bond, built on tougher alloys including tungsten carbide, holds diamond longer and is correct for soft, abrasive materials like asphalt, green concrete, sandstone and limestone.
Mismatch the pair and the failure modes are predictable: a hard bond on hard material glazes over as dull diamonds stop cutting, while a soft bond on abrasive material simply disappears. The practical rule for buyers: hard materials want soft bonds, soft abrasive materials want hard bonds. Turbo segments, continuous rims and segmented rims then fine-tune the speed-versus-finish balance, with continuous rims giving chip-free tile cuts, segmented rims running cooler in concrete, and turbo rims splitting the difference.
Dry or Wet
Water cools the segment and suppresses silica dust, which is why wet cutting extends blade life and is the professional default where hoses are practical. Dry cutting with laser-welded blades is the jobsite convenience option; segment cooling during dry work comes from air flow and periodic free-spinning of the blade out of the cut.
FANXI's diamond range covers the full construction spectrum: dry-cutting and wet-cutting blades, turbo types for combined wet and dry use, sintered segment and sintered turbo blades, silver-brazed blades, laser-welded blades for reinforced concrete, tuck point blades for mortar raking, diamond grinding wheels and diamond core drills for stone. Bonds are formulated per application and custom segment specifications are available for OEM programs, supported by technical data on mesh size and diamond concentration for distributor training.