TWP70
Macrocrystaline nickel tube which can be welded with or without shielding gas. Macrocrystal- line tungsten has a higher melting point than that of the molten welding puddle, therefore the matrix is not affected by the degradation of Tungsten carbides throughout the matrix.
The result is a stable matrix which is not brittle and can absorb impact without cracking.
Welding Procedure
The surface should be free from oil, rust and other contaminants by grinding if necessary. The weld deposit may be applied using stringer or weave beads. Overlay as per parent material welding procedure for pre/post heat, post weld cooling should be gradual. Grinding is possible, the deposit is not machinable or forgeable. Minor stress relieving (cross-checking) occurs during cooling.
TWP70 Drilling Augers
The above augers are lined with TWP70 to prevent wear and reduce switchouts.
Wire Spools
Spool size depends on type of wire and size.
Applications
TWP70 can be applied on ferritic and austenitic steels using an open or closed arc welding procedure, with or without gas shielding.
TWP70 is used to overlay and protect areas which are exposed to the most extreme abrasion and/or impact. TWP70 has been used for diamond bit augers, cement factory fan blades, bucket teeth, and crusher rolls.
Wire Welding Parameters
| Diameter | Stickout +/-
.25”(6.35mm) |
Amps | Volts |
| 1/16” (1.6 mm) | 1.5” (38.1mm) | 180 – 200 | 26- 30 |
| 3/32” (2.4 mm) | 1.5” (38.1mm) | 180 – 200 | 26 – 30 |
| 7/64” (2.8 mm) | 1.5” (38.1mm) | 180 – 200 | 26 – 30 |
The above is based on a FCAW welding process with DC Reverse polarity, using no shielding gas.
Electrode Welding Parameters
| Diameter | Amps |
| 5/32” (4.0mm) | 110 – 130 |
| 3/16” (5.0mm) | 130 – 150 |
| 1/4” (6.0mm) | 140 – 160 |