TUNGAHARD 950
AWS Specification :NONE
JIS Specification: DFWA-700S
Other Specification: NONE
I. APPLICATIONS:
Hard surfacing of shovel teeth, cutter knives of dredger and speed mullers, etc.
II. DESCRIPTION:
TUNGAHARD 950 obtain a weld metal which contains large quantity of dispersed tungsten carbide and withstands heavy soil impact-free abrasion. Machining as-welded condition is impossible.
III. NOTES ON USAGE:
Usually over 200ºC preheating and 500~600ºC postheating are required.
Take care of the increase of cracking tendency when used for over triplelayer welding.
Underlaying with low hydrogen type electrodes (PA-52 or PA-18) is required.
Dry the electrodes at 150~200ºC for 30~60 minutes before use.
IV. TYPICAL CHEMICAL COMPOSITION OF WELD METAL (%):
C | Si | Mn | Cr | Mo | W |
2.78 | 0.29 | 3.22 | 0.10 | 0.12 | 47.30 |
V. HARDNESS OF WELD METAL:
60-69 HRC (700-950 Hv)
VI. WELDING POSITIONS:
FLAT, FILLET, VERTICAL UP, HORIZONTAL, OVERHEAD
VII. SIZES AVAILABLE AND RECOMMENDED CURRENTS (AC or DC + ):
Size (dia. mm) | 3.2 | 4.0 | 5.0 |
Length (mm) | 350 | 350 | 350 |
Current Range (Amp) | 90 – 130 | 120 – 180 | 170 – 230 |