Three automatic projection welding machines,
up to 1,000 tons a month
Rolled bar in, finished grating out: projection welding, fabrication, hot-dip galvanizing, three inspections and packing, all in one flow on a site of approx. 29,750 m².
- 32,230 kVA automatic projection welding machines
- Up to1,000t/moGrating production capacity
- 29,750m²Site area, approx. (9,000 pyeong)
- 31yrsAverage experience of projection welding crew
Main equipment
Grating quality is decided at the projection welding machine. We run three 2,230 kVA automatic projection welding machines from Nisseki (Japan) and Taeyang Industrial in parallel, so large project volumes and tight delivery dates can be handled together.
| Category | Equipment | Specification | Qty |
|---|---|---|---|
| Grating | Automatic projection welding machine | 2,230 kVA, 2-bar (two cross bars welded at once); Nisseki Eng. (Japan) ×1, Taeyang Industrial ×2 | 3 |
| Grating | High-speed cutter | 30 kW × 2P | 3 |
| Grating | Disc cutter | 3.7 kW × 4P | 3 |
| Grating | Saw blade grinder | OD 609 mm × 10 mm, made in Germany | 2 |
| Grating | CO₂ / arc welder | 500 A, 20–25 kVA | 15 |
| Machining | Lathe, milling, radial drill, drill press, surface grinder | Hwacheon and others | 11 |
| Handling | Overhead crane | 3 t / 5 t | 4 |
| Handling | Hoist | 1 t | 8 |
| Handling | Forklift | 3 t | 2 |
| Measuring & testing | Surface plates, height and cylinder gauges, micrometers, coating thickness gauges, etc. | Mostly made in Japan | 31 |
Ten-step production process
Every product is made to the customer's drawings and inspected three times before shipment. Red numbers mark the inspection steps.
- 01
Raw Material
SS400 and SS275 rolled bars are sourced from Korean rolling mills.
- 02
Projection Welding
Bearing bars and cross bars are joined by electric resistance projection welding.
- 03
Fabrication
Panels are cut to drawing dimensions; end bars and cut-out banding are welded.
- 04
Fabrication Inspection
Dimensions and welds are checked against NAAMM tolerances.
- 05
Galvanizing
Hot-dip galvanized to KS D 8308, JIS H8641 and ASTM A123.
- 06
Coating Inspection
Coating thickness and surface condition are measured.
- 07
Final Inspection
Quantity, fabrication marks and final dimensions are verified.
- 08
Packing
Bundled and marked in installation sequence.
- 09
Delivery
Shipped to site on the scheduled delivery date.
- 10
Installation
Installed on site with fixing clips and similar fasteners.
Quality control
- Tolerances
- Per NAAMM (National Association of Architectural Metal Manufacturers).
- Three inspections
- Fabrication, coating and final inspections are carried out by the Quality Control team with 31 measuring and testing instruments.
- Certification
- ISO 9001 (quality) and ISO 14001 (environment), scope "Manufacture of grating and steel structures", valid until May 25, 2028.
- Traceability
- Every piece carries a fabrication mark, tracked by work order number from drawing to shipment.
Our projection welding crew averages
31 years of experience
However good the machine, it takes people to read the variations in rolled bar and welding current. Our projection welding team is built around operators who have made nothing but grating for over 30 years.
| Team | Staff | Role |
|---|---|---|
| Projection Welding | 5 | Operates the automatic projection welding machines; 31 years of experience on average |
| Fabrication | 11 | Cutting, welding, machining |
| Packing | 3 | Packing and shipping |
| Quality Control | 3 | Fabrication, coating and final inspection |
| Production Management | 2 | Scheduling and delivery management |
| R&D Center | 4 | Design and load review |