Steel Connection Plate Fabrication | Gusset & Base Plates – PCJ Vietnam

Every bolted structural steel connection depends on a fabricated plate a gusset, base plate, end plate, or bracket that transfers load between connected members. The quality of these connection plates directly determines the structural capacity and reliability of the entire steel framework. Yet connection plate fabrication is often treated as routine production work when it actually demands careful attention to material selection, dimensional accuracy, and surface quality.

This guide covers everything buyers and engineers need to know about steel connection plate fabrication, from design considerations through manufacturing processes to quality requirements.

Structural connections demand quality plates. Contact PCJ Steel Processing for fabricated connection hardware you can trust.

What Are Steel Connection Plates and Why They Matter

Steel connection plates are flat or formed steel components that facilitate load transfer at structural joints. They provide the interface between structural members beams to columns, braces to frames, columns to foundations enabling the assembly of individual members into complete structural systems.

Connection plates matter because they are often the weakest link in a structural system. While rolled steel beams and columns have well-characterized properties guaranteed by the steel mill, connection plates are fabricated products whose quality depends entirely on the fabricator’s processes. An undersized plate, a mispositioned hole, or a substandard weld at a connection can reduce the capacity of an entire frame.

For this reason, structural connection plate fabrication requires the same engineering rigor and quality control applied to primary structural members. PCJ Steel Processing treats connection plate fabrication as a critical process, not a commodity operation.

Types of Steel Connection Plates

Gusset Plates

Gusset plates connect diagonal bracing members to columns and beams in braced steel frames. They are typically triangular or trapezoidal in shape, with bolt holes or welding provisions for connecting the brace member and attachment to the frame.

Gusset plates must be designed to resist combined axial, shear, and moment forces at the connection. The plate thickness, edge distances, and bolt group configuration all affect the connection capacity.

PCJ Steel Processing fabricates gusset plates in thicknesses from 6mm to 30mm using carbon steel grades including SS400, A36, A572, S355, Q235, and Q355.

Base Plates

Base plates connect steel columns to concrete foundations. They distribute the column load over a larger area of concrete and provide an interface for anchor bolt attachment.

Base plate fabrication requires flatness control because the plate must bear uniformly against the grout or concrete surface. Anchor bolt holes must be accurately positioned to match the bolt layout cast into the foundation.

Angle Brackets

Angle brackets provide 90-degree connections between structural or non-structural elements. They are commonly used for beam-to-column connections, shelf angle supports, and equipment mounting.

PCJ Steel Processing fabricates angle brackets with bolt holes, slots, or welding preparations according to project requirements.

Shear Plates and End Plates

Shear plates and end plates provide connections at beam ends, transferring shear and moment forces to supporting columns or other beams. These plates are welded to beam ends in the fabrication shop and bolted to supporting members during erection.

End plate thickness, stiffener requirements, and bolt group configuration are determined by the connection forces specified in the structural design.

Material Grades for Connection Plate Fabrication

Material grade selection for connection plates depends on the structural design requirements. Common grades include SS400 and Q235 for general construction applications with moderate load requirements. A36 as the standard structural steel grade widely specified in international projects. A572 Grade 50 and S355 for higher-strength applications where reduced plate thickness or increased load capacity is needed. Q355 as a Chinese standard equivalent to S355.

All material grades used by PCJ Steel Processing are verified against mill certificates to confirm chemical composition and mechanical properties meet specification requirements.

The Connection Plate Fabrication Process

Connection plate fabrication at PCJ Steel Processing follows a controlled sequence. Material selection and cutting involves selecting the appropriate steel grade and thickness from verified stock, then cutting plates to the required outline dimensions using CNC or plasma cutting technology. Hole drilling or punching creates bolt holes at positions and diameters specified in the connection drawing. For structural connections, hole quality affects bolt bearing capacity, so drilling is preferred over punching for thicker plates. Edge finishing ensures cut edges meet the surface quality requirements for structural applications, removing burrs, notches, and rough edges that could serve as stress concentration points. Welding preparation prepares weld interfaces for any shop welding required, including joint preparation, fit-up verification, and surface cleaning. Surface treatment applies the specified protective coating, whether hot-dip galvanized, painted, or plain.

From 6mm to 30mm thickness, any grade, any configuration PCJ fabricates connection plates to your exact specifications.

Hole Patterns and Bolt Group Design

Hole patterns are critical features in connection plate fabrication. Every hole must be positioned accurately because the bolt group transfers structural loads through bearing on the plate and friction between clamped surfaces.

Key considerations for hole fabrication include hole diameter, which is typically specified as the bolt diameter plus a clearance (usually 2mm for standard holes). Edge distance must meet minimum requirements specified in the structural design code. Bolt spacing must satisfy minimum and maximum spacing requirements. Hole quality must be free of burrs, elongation, or tapered profiles that could affect bolt bearing.

PCJ Steel Processing uses CNC drilling for connection plates requiring precise bolt group geometry. Drilling templates and fixture systems ensure consistent hole positioning across production batches.

Surface Treatment Options for Connection Plates

Surface treatment for connection plates depends on the service environment. Black or plain finish is suitable for interior applications or where the plates will be painted as part of the overall structure after erection. Primer painting provides temporary corrosion protection during transport and construction. Hot-dip galvanizing provides long-term corrosion protection for exterior applications. Powder coating provides both corrosion protection and aesthetic finish for architectural connections.

PCJ Steel Processing advises on surface treatment selection based on the environmental exposure, expected service life, and aesthetic requirements of each project.

Quality Standards for Connection Plate Fabrication

Connection plate fabrication quality requirements are defined by structural design codes and project specifications. Common reference standards include AISC 360 for structural steel buildings (North American practice), AS 4100 for steel structures (Australian practice), and EN 1090 for execution of steel structures (European practice).

These standards specify requirements for material properties, dimensional tolerances, hole quality, surface condition, and documentation. PCJ Steel Processing fabricates connection plates in compliance with the applicable standard for each project.

PCJ Connection Plate Fabrication Capabilities

PCJ Steel Processing offers comprehensive connection plate fabrication covering material grades from SS400 through A572 and S355, thicknesses from 6mm to 30mm, dimensions upon request to suit any connection design, surface treatments including plain, galvanized, and powder coated, and documentation including material certificates, dimensional inspection records, and certificates of conformity.

Order Connection Plates from PCJ

PCJ Steel Processing Co., Ltd.

Tel: +84 28 3620 1768 | Website: www.pcjsu.com

Your structural connections deserve quality-fabricated plates. Send your connection drawings to PCJ Steel Processing for a detailed quotation.