1.Why is waterjet cutting so suitable for galvanized coils?
Cold processing, no heat-affected zone (the most important advantage)
Avoids zinc coating damage: Thermal cutting methods like laser and plasma generate high temperatures, causing the zinc coating near the cut to melt, evaporate, and oxidize, losing its corrosion protection. The cut edge will turn black and become susceptible to rust.
Maintains material properties: Waterjet cutting is a purely physical process, generating no heat. Therefore, it perfectly preserves the original state and corrosion resistance of the zinc coating, resulting in smooth cuts free of thermal damage.
Excellent cutting quality
Smooth, burr-free cuts with high precision.
No burn marks, slag, or harmful gases (such as zinc vapor) are produced on the material surface.
No harmful substances are generated
High-temperature cutting of galvanized sheet metal produces zinc oxide fumes, which are harmful to human health and require specialized dust removal equipment. Waterjet cutting completely avoids this problem, making it more environmentally friendly and safer.
2.What are the precautions for water jet cutting galvanized coils?
Rust Prevention of Cutting Edges
Waterjet cutting uses high-pressure water mixed with abrasives (usually garnet sand). The cut surface is exposed steel, and the protection provided by the galvanized layer is no longer there.
Therefore, after cutting, the cut edges must be treated with rust prevention, such as spraying with zinc-rich paint, anti-rust paint, or sealant, to prevent rust from starting at the cut edge.
Residual Moisture Issues
After cutting, the material and cut surface will be very damp. If galvanized coils are tightly wound or stacked, the moisture inside will not evaporate easily, potentially causing "water rust" (white rust or yellow spots) between the layers.
Solution:
After cutting, promptly dry the cut surface and surrounding area with compressed air or a dry cloth.
Store cut workpieces separately to ensure adequate ventilation and drying.
3.What are the advantages of water jet cutting for galvanized coils?
No heat impact, maintains corrosion resistance; environmentally friendly and smoke-free; high cutting quality
4.What are the advantages and disadvantages of laser cutting for galvanized coils?
Advantages of galvanized coils: Extremely fast processing speed, high precision, and automation. Disadvantages of galvanized coils: Heat-affected zone (HAZ) damages the zinc layer; blackened cut edges require post-processing; zinc fumes require dust removal.
5.What are the precautions for using water jet cutting for galvanized coils?
Strict corrosion resistance requirements for the cut surface are required, and the product lifespan does not need to be reduced due to cutting.
Post-cut processing (such as repainting) is inconvenient or impossible.
Cutting complex parts.
Environmentally friendly, avoiding handling harmful substances such as zinc fumes.