Problem
Welding galvanized strip produces zinc vapor that contaminates the weld, leaves black seams and porosity, and coats nearby parts with zinc oxide dust, degrading weld strength and appearance.
Cause
Zinc melts and vaporizes well below steel's welding temperature, so the zinc coating on the strip edges vaporizes during HF welding and can be trapped in the molten pool, causing porosity and weak seams.
Solution
The ZY16 keeps weld heat tight and localized with the 100kW solid-state HF welder, minimizing zinc vapor generation at the seam. Controlled edge alignment and speed-matched power limit coating burn-back so the GI surface stays intact outside the narrow weld line, and fume extraction at the weld station removes zinc vapor for operator safety.
Key Engineering Data
- Tight, localized weld heat minimizes zinc vapor at the seam.
- Speed-matched power limits coating burn-back on GI strip.
- Controlled edge alignment keeps the seam clean and centered.
- Fume extraction recommended at the weld station for safety.
| Parameter | Specification |
|---|
| Mill Model | ZY16 |
| Tube OD Range | Φ8-18 mm |
| Wall Thickness | 0.4-1.0 mm |
| Strip Width Range | 25-57 mm |
| Max Line Speed | 90 m/min |
| HF Welder Power | 100 kW Solid-State High Frequency |
| Strip Material | Hot Rolled / Cold Rolled / Galvanized Steel |
| Uncoiler | Double-Mandrel Pneumatic, 1.5-Ton Coil Capacity |
| Accumulator | 200 m/min High-Speed Cage |
| Strip Leveling | Seven-Roller Leveling Unit |
| Forming Stands | 5-Stand Rough + 3-Stand Precision |
| Roller Geometry | Double-Radius Forming Rollers |
| Roller Shafts | 42CrMo High-Strength Alloy Steel |
| Safety | Forming Stand Overload Protection |
Performance & Quality
Welding pre-galvanized strip, the ZY16 keeps heat tight and localized to limit zinc vapor, so the seam stays sound and the coating stays intact outside the weld line. With fume extraction, operators work safely and the line stays clean, producing Φ8-18mm GI tube ready for outdoor use.
Application
For pre-galvanized Φ8-18mm tube used in fence posts, conduits, greenhouse and agricultural frames, and outdoor structures where corrosion resistance is required without post-galvanizing.
Selection Guide
Choose this mill when you weld pre-galvanized strip. Confirm coating weight and strip width, and ensure fume extraction is installed at the weld station for zinc vapor handling.
Application Scenarios
Galvanized fence and gate tube, electrical conduit, greenhouse framing and outdoor structural tube welded directly from pre-galvanized coil.
FAQ
Q1. Does welding galvanized strip weaken the seam?
Zinc vapor can cause porosity, so the ZY16 keeps heat tight and localized to limit coating burn-back and keep the weld seam sound and fully fused.
Q2. Do I need fume extraction?
Yes, zinc fume extraction at the weld station is recommended for operator safety and to keep equipment clean of zinc oxide dust.
Q3. Can I weld hot-dip galvanized strip?
Pre-galvanized coil is preferred; heavy hot-dip coating is harder to weld cleanly, so confirm coating weight with us first.
Q4. Does the weld area need touch-up?
A light seam treatment or touch-up zinc spray is common on GI tube, since the welded line itself is not galvanized after welding.
Q5. How clean is the seam on galvanized tube?
The weld line itself is bare steel, but the ZY16 limits burn-back to a narrow band, so the surrounding zinc coating stays intact and the seam is strong.
Q6. What fume handling is needed for GI strip?
A weld-station fume extractor is recommended for zinc vapor; we size the extraction to your line speed and coating weight.
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