It is suitable for the welding of high-strength gray iron and nodular cast iron, such as cylinder, engine block, gear box, etc.
CHARACTERISTICS
Z408 is the cast iron electrode with nickel iron alloy core and strong reduction of graphite coating. It can be used in AC and DC dual purpose, has stable arc, and is easy to operate. The electrode has the characteristics of high strength, good plasticity, low linear expansion coefficient and so on. The crack resistance for grey cast iron is as much as that for Z308, while the crack resistance for nodular cast iron is more than Z308. For cast iron with higher phosphorus (0.2%P), it also has a good results and its tocutting performance is lower than Z308 and Z508 slightly. Z408 is used in the welding of gray iron and nodular cast iron for room.
ATTENTION
Before welding, the electrodes need to be baked for 1 hour with the temperature of 150±10℃ before using.
When welding, it is appropriate to take narrow weld and each weld length should not exceed 50mm.
Hammer the welding area lightly with a hammer immediately after welding in order to eliminate stress and prevent cracks.
Lower heat input is recommend.
Chemical Composition of the deposited metal (%)
Elements
C
Si
Mn
S
Fe
Ni
Cu
Other
Standard Value
0.35-0.55
≤0.75
≤2.3
≤0.025
3.0-6.0
60-70
25-35
≤1.0
Welding Reference Current (AC, DC+)
Electrode Diameter (mm)
3.2
4.0
5.0
Length (mm)
350
350
350
Welding Current (A)
90-110
120-150
160-190
Frequently Asked Questions
1. What are the primary applications for Z408 electrodes?
Z408 is specifically designed for high-strength gray iron and nodular cast iron. It is commonly used for repairing critical automotive and industrial components like engine blocks, cylinders, and gear boxes.
2. Does Z408 support both AC and DC welding?
Yes, Z408 is a dual-purpose electrode that operates effectively on both AC and DC+ (Direct Current Positive) power sources, offering a stable arc and easy operation.
3. How should Z408 electrodes be stored and prepared?
Electrodes must be kept dry. Before use, they should be baked at a temperature of 150±10℃ for approximately 1 hour to ensure optimal welding performance.
4. What is the benefit of the Nickel-Iron (Ni-Fe) core in Z408?
The Ni-Fe alloy core provides high strength, excellent plasticity, and a low linear expansion coefficient, which significantly improves crack resistance, especially when welding nodular cast iron.
5. How can I prevent cracks during the welding process?
It is recommended to use low heat input, maintain narrow weld beads (under 50mm length), and lightly hammer the weld area immediately after welding to relieve internal stresses.
6. Can I request product samples for testing?
Small quantity samples (typically 1-2 kgs) are available for quality evaluation, though shipping costs are generally handled by the requester.
Tianqiao Welding
