In the steel tube industry, galvanized steel pipes are widely used in construction, infrastructure, and mechanical systems. Galvanized welded steel pipes are made by coating electric resistance welded (ERW) steel pipes with a protective layer of zinc to be protected against corrosion. The production process involves forming, welding and zinc spraying (on the weld seam).
However, the weld seam becomes a critical weak point:
- Zinc depletion : With its relatively low boiling point (~900 °C), zinc is vaporized or consumed during welding, leaving the seam unprotected.
- Accelerated corrosion : Once the galvanization layer is lost, the bare steel at the weld is directly exposed to corrosive environments.
- Reduced service life : Corrosion initiates at the seam, compromising the structural integrity of the tube and shortening its lifespan.
Without corrective measures, the corrosion resistance of galvanized steel pipes is effectively eliminated at the weld seam.
WHY CHOOSE SAINT-GOBAIN COATING SOLUTIONS
We are a global leader in advanced metallization processes, trusted by leading steel tube manufacturers worldwide.
- Proven Expertise in Flame Spray : Decades of experience with zinc wire spraying ensure reliable protection against weld seam corrosion.
- Tailored for Tube Production : Our equipment and processes are designed to integrate seamlessly into existing tube lines without disruption.
- End-to-End Process Mastery : From spray parameters to coating performance, we ensure consistent, high-quality results across facilities and production speeds.
- Global Reach with Local Support : With a footprint across five continents, we provide technical expertise, logistics coordination, and on-site support wherever you operate.
OUR SOLUTION: FLAME SPRAY EQUIPMENT FOR WELD SEAMS
To restore full corrosion resistance, Saint-Gobain Coating Solutions offers a complete portfolio of flame spray guns engineered for reliable zinc deposition on steel tubes. Our systems are designed to integrate smoothly into tube manufacturing lines, delivering repeatable, high-quality coatings with minimal zinc waste and low fume emissions, ensuring excellent coverage and a smooth surface finish.
Z-Jet Flame Spray Gun
Economical, ergonomic and easy-to-use
The Z-Jet® is our most lightweight and ergonomic gun, ideal for long operations or complex shapes. It ensures excellent coverage with zinc, aluminum, or zinc-aluminum wires at low investment cost.
- Lightweight and easy to operate
- Quick setup for shop or on-site use
Top Jet Flame Spray Gun
Robust, versatile and powerful
The Top-Jet®, just as easy to use as the Z-Jet, is a durable, high-torque flame spray gun designed for intensive industrial use. It supports a wide range of wire types and diameters, offering faster and more flexible spraying.
- Strong, long-lasting design
- Fast maintenance
- Handles large wire diameters for higher deposition rates
Master Jet Auto IV Flame Spray System
Automated, precise and efficient
The MasterJet® Auto IV is our top-performing solution for continuous automated production.
It combines process control and coating consistency for large-scale manufacturing.
- Fully automated, robot-ready integration
- PLC- monitoring
OUR SOLUTION: ZINC WIRE FOR FLAME SPRAY
Alongside our equipment portfolio, Saint-Gobain Coating Solutions provides high-purity zinc wire optimized for flame spray metallization in welded tube applications.
Our zinc wire ensures:
- Excellent adhesion to steel weld seams
- Dense, protective coatings that fully restore galvanization benefits
- Reduced fume emissions compared to arc spray processes
- Consistent performance with minimal porosity and oxidation
Zinc Wire for Weld Seam Protection
Key features:
- Multiple wire diameters tailored to tube production speeds
- Stable spray process with reduced overspray
- Compatible with manual, semi-automatic, and fully automated flame spray systems
When combined with our flame spray guns, Saint-Gobain zinc wire delivers:
- Dense, smooth coatings with long-lasting corrosion protection
- Lower operating costs through reduced zinc consumption
- Cleaner, safer operations with far fewer emissions than twin-wire arc spraying
Request the Zinc Wire Product Sheet
NEED HELP PROTECTING YOUR WELD SEAMS?
We can help you identify the right flame spray system and zinc wire for your welded tube production line.
