D707
Description:
D707 is a low hydrogen sodium type coating tungsten carbide welding electrode with carbon steel as the welding core. Depending on the transition of carbides and alloys in the coating, the tungsten content of the surfacing metal is 40-50%. Because the coating is thick, the welding process Sleeve longer, easy to fall off after the drug redness, it is appropriate to use DC reverse, using a smaller current.
use:
Used for surfacing mechanical parts that are highly resistant to rock abrasion, such as concrete mixer blades, bulldozers and pump blades, dredger blades, high-speed sandboxes, and the like.
Deposited metal chemical composition (%)
| C | Mn | Si | W |
guarantee value | 1.50 ~ 3.00 | ≤2.00 | ≤4.00 | 40.00 ~ 50.00 |
Surfacing layer hardness:
HRC ≥60
Reference current (DC + )
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 70 ~ 120 | 140 ~ 180 | 180 ~ 220 |
Precautions:
1. Before welding electrodes to be 300 ~ 350 ℃ baking 1h.
2. Preheating temperature is 300 ℃ when the surfacing weldment is carbon steel, preheating temperature is 400 ~ 500 ℃ when the surfacing weldment is low alloy steel, and preheating temperature is 600 ~ 650 ℃ when the surfacing weldment is stainless steel.
3. Low-alloy steel and stainless steel to be annealed at 700 ℃ after welding.
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