DC Multi-Head Spot Welding Machine for Steel Grating and Wire Mesh Production

An industrial DC multi-head resistance spot welding machine engineered for high-volume steel grating and wire mesh manufacturing. With 40-200KVA DC power range, multiple synchronized welding heads, and PLC automatic control, this system delivers stable, energy-efficient DC welding current for consistent weld quality across steel grating panels, reinforcement mesh, wire mesh products, and construction wire grids. The DC (direct current) output eliminates the current fluctuation inherent in AC welders, providing uniform heat distribution and stronger weld joints — critical for load-bearing grating and structural mesh applications.

Industrial DC multi-head resistance spot welding machine for steel grating and wire mesh manufacturing.

Watch It Working

DC Welding Technology Advantages

1. Stable DC Welding Current
Unlike conventional AC welders that experience current zero-crossing and fluctuation, the DC output provides continuous, ripple-free welding current. This delivers uniform heat distribution at every weld point, resulting in consistent nugget formation and stronger weld joints. For steel grating and structural mesh where every weld point contributes to load-bearing capacity, DC current stability is a critical quality advantage.

2. Multi-Head Simultaneous Welding
Multiple welding heads operate simultaneously with independent pneumatic pressure control, dramatically increasing production throughput. The synchronized multi-point welding design is ideal for steel grating panels with numerous cross-bar intersections and wire mesh products requiring high-density weld patterns. This parallel operation reduces production time per panel by over 60% compared to sequential welding methods.

Multiple DC welding heads with pneumatic pressure control for simultaneous steel grating spot welding.

3. Energy-Efficient 40-200KVA Power Range
DC resistance welding achieves the same weld quality at lower energy consumption compared to equivalent AC systems due to reduced reactive losses. Available in configurations from 40KVA (light wire mesh) to 200KVA (heavy steel grating), the power range covers the full spectrum of grating and mesh production requirements. Lower power settings optimize operating costs for standard products, while higher settings handle thick bearing bars up to 6+6mm.

4. PLC Automatic Production Control
The PLC system manages welding sequence timing, electrode pressure parameters, and production automation. Operators can store multiple product specifications as preset programs, enabling quick changeover between different grating panel sizes and wire mesh configurations. The intuitive touch-screen interface reduces operator training requirements and ensures production consistency across shifts.

PLC touch-screen control panel for DC multi-head welding machine with automatic production management.

Technical Specifications

Production Applications

Steel Grating Manufacturing
Industrial walkway grating, platform grating, trench covers, drainage grating, and stair treads. The DC stable current ensures consistent weld penetration at every cross-bar intersection, critical for grating products where load-bearing safety depends on uniform weld quality across the entire panel.

Wire Mesh Production
Construction reinforcement mesh, fence panels, wire mesh sheets, and industrial wire grids. The multi-head configuration enables high-speed, high-volume production for standard mesh specifications with consistent weld spacing and strength.

Custom Metal Fabrication
Steel bar grids, storage rack mesh, machine guards, and customized wire products. The PLC programmable parameters allow quick adaptation to different wire diameters, mesh sizes, and product configurations for job-shop production environments.

Why Choose Xinwei Welding

Factory & Quality Control

• 100% DC welding current calibration and stability testing on all heads
• Pneumatic electrode pressure verification and uniformity testing
• PLC control system functional testing with full production simulation
• Sample production run with customer-specified grating or mesh specifications
• Weld strength pull-testing on sample joints
• Pre-shipment inspection with comprehensive documentation

After-Sales Service & Support

Frequently Asked Questions

Q: What is the advantage of DC welding over AC for grating production?
A: DC welding provides continuous, ripple-free current without the zero-crossing interruptions of AC. This results in more uniform heat distribution, consistent weld nugget formation, and stronger joints. For steel grating where every cross-bar weld point contributes to load-bearing safety, DC current stability is a significant quality advantage over conventional AC welders.

Q: Can this machine produce both steel grating and wire mesh products?
A: Yes. The PLC system stores multiple product presets, allowing you to switch between steel grating specifications and wire mesh configurations. The 40-200KVA power range covers both heavy grating (thick bearing bars, 200KVA) and standard wire mesh (thinner wires, 40-100KVA). Electrode configuration is customized based on your product range.

Q: How long does it take to change between different product specifications?
A: Typical changeover between stored PLC presets takes under 30 minutes. This includes electrode spacing adjustment and parameter loading from the touch-screen interface. Our engineers provide comprehensive training on the changeover process during installation.

Q: What is included in the delivery and installation?
A: The complete DC welding system with configured welding heads, PLC controller, pneumatic system, and cooling unit. Delivery is 25-45 working days. On-site installation and commissioning takes 5-7 working days including PLC programming, trial production, and operator training.

Company Profile