LOW ALLOY HEAT TREATABLE STEELS
DESCRIPTION
Electrode for welding tool steels which can be thermally treated to improve mechanical properties. A minimal amount of Hydrogen in the welding material enables crack free welding.
APPLICATION
- SAE 8630.
- SAE 4130.
- SAE 4340.
Technique and Recommendations
When base metal thickness is bigger than 6 mm the steel should be pre-warmed to 250°C and welding should be performed immediately. The interpass temperature should be maintained at 250°C. Thinner material should be warmed if rapid cooling is suspected. A short arc should be maintained with a seam no wider than the thickness of the electrode.
MECHANICAL PROPERTIES
| Oil quench 870°C Tempered 620°C | Oil quench 870°C Tempered 510°C | |
| Yield strength [N/mm^2] | 834 | 1048 |
| Tensile strength [N/mm^2] | 951 | 1124 |
| Elongation [%] | 18 | 16 |
| Reduction of area [%] | 32 | 36 |
Welding positions
RE-DRYING
300°C/2H
| Diameter | Length | Current [amps] | ||
| in | mm | in | mm | |
| 3/32 | 2.50 | 14 | 350 | 75-100 |
| 1/8 | 3.25 | 14 | 350 | 110-140 |
| 5/32 | 4.0 | 14 | 350 | 150-190 |
| 3/16 | 5.0 | 14 | 350 | 190-260 |
