TWP71
TWP71w is an iron based steel alloy with a near nanoscale (submicron) microstructure that includes chromium, molybdenum and niobium in the material chemistry, resulting in an overlay wear solution well suited for the toughest jobs in the most extreme service environ- ments.
TWP171w is a multicomponent steel alloy with a unique uniform glass-forming melt chemistry that allows high undercooling to be achieved during welding. This results in considerable refinement of the crystalline microstructure down to a near nanosize (submi- cron) range. Unlike conventional weld overlay materials which are macrocomposites containing hard particles and general carbides in a distinct hard particles in a binder and is a uniformly hard matrix when welded.
This allows TWP171w to provide vastly improved hardness macrocomposites. Additionally, TWP171w is an iron-based alloy without tung- sten carbide particulates.
Applications
TWP71w can be applied to carbon steel, manganese base materials and mild or alloys steels. The maximum recommended deposits thickness of TWP71w is 2 layers, or 1/4” (6.35mm).
TWP71w is used to cover exposed bolts and seams for installation of wear plate and parts, as well as for small area lining of heavy wearing parts and equipment.
High Hardness
TWP171w maintains maximum hardness performance of 66-71 HRc from the weld interface throughout the entire overlay in single pass applications allowing the overlay to be fully protective throughout the volume.
High Wear Resistance
TWP171w weld deposits should be limited to two layers maximum for most applications. Both single and double layers provide exceptional wear resistance of 0.09 – 0.11 g (+/- 0.02) mass loss in ASTM G65-04 dry sand rubber wheel abrasion tests.
Microstructure
TWP71w features a near nanoscale microstructure with grain sizes less than 400 nm.
Damage Tolerance
The superior toughness of TWP171w occurs from the in-situ formation of high-volume fraction phases allows the reduction of stress concentration sites and the ductile matrix supplies effective crack blunting and bridging, resulting in improved impact resistance.
TWP71 Wire Parameters
| Diameter | Stickout +/-
.25”(6.35mm) |
Amps | Volts |
| .045” (1.2mm) | 1” (25.4mm) | 135 – 185 | 24 |
| 1/16” (1.6mm) | 1” (25.4mm) | 220 – 270 | 24 |
| 3/32” (2.4mm) | 1” (25.4mm) | 375 – 425 | 25 |
| 7/64” (2.8mm) | 1.25” (31.75mm) | 450- 500 | 26 |