Views: 51515 Author: Site Editor Publish Time: 2026-06-11 Origin: Site
Customized Cutting: Achieving Accurate Profiles and Hole Patterns
The first step in fabricating embedded plates is precision cutting to match exact engineering drawings. Carbon steel plates (typically ASTM A36 or Q235B) are most common, though stainless steel grades (304, 316) are specified for corrosive environments. High-definition plasma cutting is preferred for plates ranging from 6mm to 50mm thickness, achieving tolerances of ±1.5mm with minimal heat-affected zone (HAZ). For thinner plates (3–12mm) or intricate shapes, fiber laser cutting delivers burr-free edges and positioning accuracy within ±0.1mm, ideal for anchor bolt holes and slots. After cutting, all edges must be deburred and, if required, beveled (e.g., 45° for full-penetration welds). CNC drilling or punching may be used for smaller hole quantities. Quality control checks verify hole positions, plate dimensions, and edge condition against approved shop drawings, ensuring that the embedded plate will align perfectly with rebar cages and formwork.
Welding Requirements: Studs, Bars, and Anchorage Connections
Embedded plates typically require welded attachments—shear studs, reinforcing bars, or anchor bolts—to transfer loads into the concrete. The most common welding processes are Gas Metal Arc Welding (GMAW/MIG) for high productivity and Shielded Metal Arc Welding (SMAW) for field conditions. Fillet welds (minimum leg length equal to 0.75× plate thickness) are standard for shear studs and bars. For high-load applications, full-penetration groove welds are specified, requiring proper edge preparation and back-gouging. All welders must be qualified to AWS D1.1 or applicable code, and welding procedure specifications (WPS) must be established. Preheating (typically 50–100°C) is required for plates thicker than 25mm or when ambient temperature is below 5°C to prevent hydrogen-induced cracking. Post-weld inspection includes visual examination for cracks and undercut, plus magnetic particle testing (MT) for critical attachments. Weld studs should be tested with a calibrated torque wrench to verify adequate fusion.
Surface Treatment and Quality Assurance for Long-Term Durability
After cutting and welding, embedded plates must be protected against corrosion, especially for outdoor or marine use. Abrasive blasting to SA 2.5 (near-white metal) removes mill scale and weld slag, followed by application of a zinc-rich primer or epoxy coating. For galvanized embedded plates, hot-dip galvanizing (HDG) after fabrication provides sacrificial protection; however, care must be taken to avoid hydrogen embrittlement of high-strength attachments. All plates should be clearly marked with piece numbers, embedment depth lines, and orientation marks to guide field installation. Dimensional verification using laser scanners or CMMs confirms that anchor bolt patterns and plate flatness meet specifications (e.g., flatness ≤ 3mm per meter). Finally, a certificate of conformance (COC) compiling material test reports (MTRs), welding inspection records, and coating thickness reports is delivered to the customer. By following these rigorous steps, fabricators produce embedded plates that ensure safe, reliable load transfer between steel structures and concrete foundations.
