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Type “W” welded steel grating is a strong and widely used steel bar grating product made by welding cross bars to load-bearing flat bars. In many st…
Type “W” welded steel grating is a strong and widely used steel bar grating product made by welding cross bars to load-bearing flat bars. In many steel grating catalogues, Type “W” refers to welded steel grating, which is commonly selected for industrial platforms, walkways, catwalks, stair treads, trench covers, drainage covers, equipment access floors, and heavy-duty service areas. It is popular because it offers reliable load capacity, stable welded structure, open-grid drainage, good ventilation, flexible custom fabrication, and surface options such as hot dip galvanizing, painting, plain top, or serrated anti-slip bearing bars.
Type “W” welded steel grating is a type of metal grating panel manufactured by welding cross bars onto bearing bars to form a rigid open-grid structure. The bearing bars carry the main load, while the cross bars hold the bearing bars in position and provide lateral stability. This structure makes Type “W” welded steel grating suitable for industrial flooring where strength, drainage, ventilation, and safe access are required.
Unlike solid steel plate, welded steel grating has open spaces between the bars. These openings allow water, oil, dust, mud, snow, small debris, air, and light to pass through the floor surface. For factories, power plants, water treatment facilities, warehouses, chemical plants, mining sites, and municipal projects, this open-grid design is useful because it reduces surface accumulation and helps maintain safer walking and working areas.
In practical purchasing terms, Type “W” welded steel grating usually means welded bar grating made from carbon steel, mild steel, or stainless steel. Carbon steel Type “W” grating is often hot dip galvanized after fabrication for corrosion resistance. The product can be supplied as standard panels, custom-cut panels, serrated panels, plain panels, stair treads, trench covers, or heavy-duty grating depending on the project requirement.
| Product Name | Main Feature | Typical Use |
|---|---|---|
| Type “W” welded steel grating | Cross bars welded to bearing bars | Industrial flooring, platforms, walkways, drainage covers |
| Plain welded steel grating | Smooth top bearing bars | Dry platforms, general access floors, equipment areas |
| Serrated welded steel grating | Toothed bearing bars for improved traction | Outdoor walkways, wet areas, stair treads, oily platforms |
| Hot dip galvanized welded grating | Zinc-coated after fabrication | Outdoor platforms, trench covers, bridge access, drainage zones |
| Heavy-duty welded steel grating | Thicker and deeper bearing bars | Forklift areas, vehicle zones, loading platforms |
The manufacturing process of Type “W” welded steel grating is based on accurate bar arrangement and strong welding. A good factory controls material size, bearing bar spacing, cross bar spacing, welding strength, panel flatness, edge banding, surface treatment, and final inspection. Since welded steel grating is often used as flooring or load-bearing cover, poor welding or poor dimensional control can create installation problems and safety risks.
The factory first prepares bearing bars and cross bars. Bearing bars are usually flat steel bars cut from carbon steel or stainless steel. Cross bars may be twisted square bars, round bars, or other steel bars depending on the grating type and specification. Before production, the factory should check bar height, thickness, straightness, surface condition, and steel grade.
The bearing bars are arranged at a fixed spacing, such as 25 mm, 30 mm, 34 mm, or 40 mm center to center. The cross bars are then placed across the bearing bars at the required spacing, such as 50 mm, 76 mm, or 100 mm. Accurate spacing is important because it affects open area, load capacity, walking comfort, weight, and appearance.
In welded steel grating production, the cross bars are welded to the bearing bars to form a stable grid. The welding must be strong enough to prevent looseness during transportation, installation, and service. For industrial grating, the welded joints must withstand vibration, impact, worker traffic, carts, and sometimes heavier loads.
After the grating panel is welded, it may be cut to the required size. Edge banding is often welded around the panel perimeter. Custom fabrication may include openings, notches, bolt holes, lifting holes, stair tread side plates, toe plates, kick plates, and special shapes according to project drawings.
Carbon steel Type “W” welded steel grating is often hot dip galvanized after fabrication. This allows zinc coating to cover welded joints, cut edges, banding bars, and other exposed steel surfaces. Painting, powder coating, or black untreated finish may also be used in some indoor or temporary applications.
| Manufacturing Step | Main Control Point | Why It Matters |
|---|---|---|
| Material preparation | Steel grade, flat bar size, straightness | Controls strength and welding quality |
| Bar layout | Bearing bar spacing and cross bar spacing | Affects load capacity, open area, and appearance |
| Welding | Joint strength and bar alignment | Ensures stable grid structure |
| Cutting and banding | Panel size, edge condition, custom openings | Improves installation fit and handling safety |
| Surface treatment | Hot dip galvanizing, painting, or other finish | Improves corrosion resistance and service life |
| Final inspection | Dimension, flatness, welds, coating, quantity | Reduces installation and quality problems |
The performance of Type “W” welded steel grating mainly depends on its bearing bars and cross bars. The bearing bars carry the main load, while the cross bars stabilize the panel. When buyers compare welded steel grating quotations, they should always check bearing bar size, bearing bar spacing, cross bar type, and cross bar spacing.
Bearing bars are the vertical flat bars that carry the load. They are usually arranged parallel to each other. During installation, the bearing bars must span between the supports. If the grating panel is installed in the wrong direction, the actual load capacity can be much lower than expected.
Common bearing bar sizes include 20 x 3 mm, 25 x 3 mm, 30 x 3 mm, 30 x 5 mm, 40 x 5 mm, and 50 x 5 mm. For heavy-duty grating, larger sizes such as 60 x 5 mm, 65 x 5 mm, or 75 x 6 mm may be used depending on the load and span.
Cross bars connect the bearing bars and help keep the grid stable. In welded steel grating, the cross bars are welded to the bearing bars. They help maintain spacing, improve panel rigidity, and keep the structure from twisting or loosening during use.
Edge banding is not always mentioned first, but it is important in many projects. A banding bar closes the open edge of the grating panel, improves appearance, protects the bearing bar ends, and makes handling safer. For custom panels, trench covers, stair treads, and panels with cut-outs, banding is usually recommended.
| Structural Part | Function | Selection Note |
|---|---|---|
| Bearing bar | Carries the main load | Height, thickness, and spacing determine load capacity |
| Cross bar | Connects bearing bars and stabilizes the grid | Spacing and welding strength affect panel stability |
| Welded joint | Locks cross bars and bearing bars together | Critical for long-term structural reliability |
| Banding bar | Closes panel edges | Useful for exposed edges, cut-outs, and trench covers |
| Open grid | Allows drainage and ventilation | Important for industrial floors and outdoor areas |
Welded steel grating and press-locked steel grating are two common types of bar grating. Both can be used for platforms, walkways, stairs, drainage covers, and access floors, but their manufacturing methods and typical advantages are different.
Welded steel grating is produced by welding cross bars to bearing bars. It is strong, practical, and widely used in industrial projects. Type “W” welded steel grating is often selected for heavy-duty or standard industrial use because its welded structure provides good rigidity and load performance.
Press-locked steel grating is manufactured by pressing cross bars into slotted bearing bars. It usually has a cleaner and more uniform appearance. It is often used in architectural walkways, public areas, commercial platforms, and locations where appearance is more important.
For most industrial flooring, drainage covers, factory platforms, and maintenance walkways, welded steel grating is often the more practical and economical choice. For architectural areas or decorative applications, press-locked grating may be preferred because of its neat visual appearance.
| Comparison Item | Type “W” Welded Steel Grating | Press-Locked Steel Grating |
|---|---|---|
| Manufacturing method | Cross bars are welded to bearing bars | Bars are pressed and locked into slotted bearing bars |
| Structural strength | Strong and practical for industrial use | Good structure with cleaner appearance |
| Appearance | Industrial appearance | Neater and more architectural appearance |
| Typical cost | Usually more economical for industrial projects | Often higher due to processing method |
| Common use | Platforms, walkways, trench covers, heavy-duty flooring | Architectural platforms, public walkways, commercial areas |
Type “W” welded steel grating can be made from several materials. The most common material is carbon steel because it provides good strength, weldability, and cost performance. Stainless steel may be selected for corrosive or hygienic environments. The right material depends on load requirement, corrosion condition, service life expectation, and project budget.
Carbon steel is the most widely used material for Type “W” welded steel grating. It is strong, economical, easy to weld, and suitable for hot dip galvanizing. For industrial platforms, drainage covers, walkways, and general factory flooring, carbon steel welded grating is often the standard choice.
Mild steel is commonly used for welded bar grating because it has good fabrication performance. It is easy to cut, weld, and galvanize. Many standard welded steel grating panels are made from mild steel flat bars and cross bars.
Stainless steel welded grating is used when corrosion resistance, hygiene, or chemical resistance is more important than initial cost. Common environments include food processing plants, chemical facilities, marine areas, coastal projects, and wastewater systems with higher corrosion risk.
Some projects require specific steel grades according to engineering drawings. Heavy-duty floors, vehicle areas, ports, power plants, and bridge access projects may require material certificates and stronger quality documentation.
| Material | Main Advantage | Common Application |
|---|---|---|
| Carbon steel | Strong, economical, and suitable for galvanizing | Platforms, walkways, trench covers, industrial flooring |
| Mild steel | Good welding and fabrication performance | Standard welded grating and stair treads |
| Stainless steel | Better corrosion resistance | Food, chemical, marine, and high-corrosion areas |
| Specified structural steel | Matches engineering design requirements | Heavy-duty floors, bridges, ports, power plants |
Hot dip galvanized Type “W” welded steel grating is one of the most common forms of welded grating for outdoor and industrial use. After welding, cutting, banding, and custom fabrication, the whole grating panel is dipped into molten zinc. The zinc coating protects the steel from corrosion and extends service life.
Welded steel grating is often installed in outdoor platforms, drainage zones, wet floors, water treatment plants, bridges, chemical facilities, and industrial plants. These environments expose steel to moisture, rain, dirt, and corrosion. Hot dip galvanizing provides better protection than untreated carbon steel and is usually more durable than basic painting in outdoor use.
Because the panel is galvanized after fabrication, zinc coating covers welded joints, cut edges, bearing bars, cross bars, banding, and many difficult-to-reach surfaces. This is important because welded areas and cut edges are more likely to corrode if they are not protected properly.
A good supplier should inspect the galvanized surface for coverage, zinc buildup, sharp points, clogged openings, bare spots, coating damage, and deformation. Good galvanizing is not only about appearance. It directly affects corrosion resistance and installation quality.
| Surface Finish | Main Benefit | Suitable Use |
|---|---|---|
| Black untreated steel | Lower initial cost | Temporary indoor use or further processing |
| Painted welded grating | Color options and basic protection | Indoor platforms or low-corrosion environments |
| Hot dip galvanized welded grating | Good corrosion resistance and long outdoor service life | Outdoor walkways, platforms, trench covers, stairs |
| Stainless steel welded grating | Higher corrosion resistance in harsh environments | Marine, chemical, food processing, and hygienic areas |
The load capacity of Type “W” welded steel grating depends mainly on bearing bar size, bearing bar spacing, clear span, steel grade, and support condition. Buyers should not choose grating only by outside panel size. Two panels with the same length and width can have very different load capacities if their bearing bars are different.
Bearing bar size is usually written as height x thickness. A higher bar improves bending strength and is better for longer spans. A thicker bar increases strength, weight, and durability. For light pedestrian walkways, smaller bars may be enough. For industrial platforms, trench covers, or forklift areas, larger bars are usually required.
Bearing bar spacing affects load distribution, weight, open area, and walking comfort. Closer spacing means more bearing bars per square meter, which increases strength and weight. Wider spacing reduces cost and improves open area, but it may not be suitable for high loads or small wheels.
The clear span is the unsupported distance between beams or supports. It is one of the most important details for selecting welded steel grating. A grating panel with 30 x 3 mm bearing bars may work on a short span but may not be suitable for a longer span. For accurate selection, the supplier should know both the load and the span.
| Bearing Bar Size | Relative Load Level | Typical Application |
|---|---|---|
| 20 x 3 mm | Light | Light pedestrian access, small covers, short spans |
| 25 x 3 mm | Light to medium | General walkways and light platforms |
| 30 x 3 mm | Medium | Industrial walkways and standard platform grating |
| 30 x 5 mm | Medium to heavy | Factory platforms, trench covers, frequent-use areas |
| 40 x 5 mm | Heavy | Heavy platforms, longer spans, stronger covers |
| 50 x 5 mm | Very heavy | Vehicle access, forklift areas, heavy trench covers |
| Bearing Bar Spacing | Weight Effect | Performance Effect | Common Use |
|---|---|---|---|
| 25 mm | Higher weight | Smaller openings and better walking comfort | Public walkways, close-mesh areas, special platforms |
| 30 mm | Medium to high weight | Strong load distribution | Industrial platforms, walkways, trench covers |
| 34 mm | Medium weight | Balanced strength and open area | General welded steel grating |
| 40 mm | Lower weight | Larger openings and lower material use | Drainage covers and economical grating panels |
Cross bar spacing and welding strength affect the stability of Type “W” welded steel grating. While the bearing bars carry the main load, cross bars hold the grid together and help maintain structural consistency during use.
Common cross bar spacing includes 50 mm, 76 mm, and 100 mm. Closer spacing creates a tighter grid and can improve stability. Wider spacing reduces weight and production cost. The correct spacing depends on the application, panel size, appearance requirement, and expected traffic.
The welded joint between the cross bar and bearing bar must be strong and consistent. Weak welding can cause cross bars to loosen, especially during transportation, installation, vibration, impact, or repeated foot traffic. In industrial floors and heavy-duty covers, welding strength is a key quality point.
For platforms, stair treads, drainage covers, and forklift areas, the grating may experience movement, vibration, or concentrated loads. Proper cross bar spacing and reliable welding help prevent deformation, rattling, looseness, and premature damage.
| Cross Bar Spacing | Structural Effect | Typical Application |
|---|---|---|
| 50 mm | Closer grid and stronger stability feel | Stair treads, special walkways, tighter panels |
| 76 mm | Balanced stability and open area | General industrial platforms and maintenance access |
| 100 mm | Common economical industrial spacing | Standard welded steel grating and drainage covers |
| Welding Quality Item | What to Check | Possible Problem If Poorly Controlled |
|---|---|---|
| Weld consistency | Cross bars welded evenly to bearing bars | Loose bars and unstable panel structure |
| Bar alignment | Bearing bars remain straight and parallel | Poor appearance and uneven load distribution |
| Panel flatness | Panel does not twist or rock | Installation difficulty and trip hazards |
| Welded edge banding | Banding is firmly attached | Weak edges and poor handling safety |
Type “W” welded steel grating can be produced with smooth bearing bars or serrated bearing bars. The choice mainly depends on slip resistance, cleaning requirements, working environment, and project budget.
Smooth welded steel grating has flat bearing bar tops. It is suitable for dry indoor platforms, equipment access floors, general industrial walkways, storage areas, and places where slip risk is low. Smooth grating is easier to clean and is often more economical than serrated grating.
Serrated welded steel grating has toothed bearing bars. The serrated surface improves traction and helps reduce slipping risk in wet, oily, muddy, dusty, or outdoor areas. It is commonly used in water treatment plants, outdoor walkways, stair treads, chemical plants, shipyards, drainage covers, and bridge maintenance areas.
The better choice depends on site conditions. Smooth Type “W” welded steel grating is suitable for dry and clean working areas. Serrated Type “W” welded steel grating is better when workers may walk on wet, oily, or exposed surfaces. For stair treads and outdoor walkways, serrated surface is usually the safer option.
| Comparison Item | Smooth Type “W” Welded Grating | Serrated Type “W” Welded Grating |
|---|---|---|
| Top surface | Flat bearing bar top | Toothed bearing bar top |
| Anti-slip performance | Suitable for dry areas | Better for wet, oily, and outdoor areas |
| Cleaning | Easier to clean | Serrations may hold more dirt in some areas |
| Cost | Usually lower | Usually higher due to serrated processing |
| Common use | Indoor platforms, equipment floors, dry walkways | Outdoor walkways, stair treads, wet platforms, drainage covers |
Type “W” welded steel grating can be supplied in standard panel sizes or custom-fabricated sizes. Standard panels are useful for stock, resale, simple walkways, and general flooring. Custom panels are more suitable for industrial platforms, trench covers, stair systems, equipment access, and projects with detailed drawings.
Common panel widths may include 500 mm, 600 mm, 750 mm, 900 mm, 1000 mm, and 1200 mm. Common panel lengths may range from 1000 mm to 6000 mm. Actual available sizes depend on factory equipment, galvanizing tank size, transportation limits, and project requirements.
| Common Panel Width | Common Panel Length | Typical Use |
|---|---|---|
| 500 mm | 1000 mm to 6000 mm | Narrow walkways, trench covers, service access |
| 600 mm | 1000 mm to 6000 mm | Drainage covers, walkway panels, platform sections |
| 750 mm | 1000 mm to 6000 mm | Industrial platforms and maintenance flooring |
| 900 mm | 1000 mm to 6000 mm | Catwalks, equipment access, general flooring |
| 1000 mm | 1000 mm to 6000 mm | Common stock panels and platform grating |
| 1200 mm | 1000 mm to 6000 mm | Large-area panels and cutting stock |
Custom Type “W” welded steel grating can be made according to CAD drawings or project layouts. Common fabrication options include cut-to-size panels, irregular shapes, notches, pipe openings, column cut-outs, bolt holes, lifting holes, toe plates, stair tread side plates, anti-slip nosing, banding, and panel numbering.
Factory-made custom grating reduces site cutting. This is especially important for hot dip galvanized grating because cutting after galvanizing damages the zinc coating. When panels are cut, welded, drilled, and banded before galvanizing, the final surface protection is more complete.
| Custom Option | What It Includes | Project Benefit |
|---|---|---|
| Cut-to-size panels | Custom length and width | Improves installation fit and reduces site cutting |
| Cut-outs and notches | Openings around pipes, columns, and machines | Allows panels to match actual site layout |
| Edge banding | Flat bars welded around panel edges | Improves appearance and handling safety |
| Stair tread fabrication | Side plates, bolt holes, nosing, serrated surface | Supports faster stair installation |
| Toe plates | Raised plates around platform edges | Helps prevent tools or objects from falling |
| Panel marking | Panel numbers according to layout drawings | Improves installation efficiency on large projects |
Type “W” welded steel grating is widely used because it provides strength, drainage, ventilation, and flexible fabrication. It is suitable for many industrial, municipal, and commercial applications where a durable open-grid flooring or covering product is required.
Industrial platforms use welded steel grating around machines, tanks, boilers, conveyors, pipe racks, valves, and maintenance areas. The open-grid structure allows liquid and debris to fall through, helping keep the walking surface cleaner and safer.
Walkways and catwalks require strong but lightweight flooring. Type “W” welded steel grating is suitable because it provides safe passage while reducing structural weight compared with solid steel plate. Hot dip galvanized welded grating is often used outdoors.
Welded steel grating is commonly used as trench covers and drainage covers. It allows water to pass through while supporting pedestrians, carts, forklifts, or vehicles depending on the bearing bar specification and support design.
Type “W” welded steel grating can be fabricated into stair treads with side plates, bolt holes, and nosing. Serrated surface is often selected for stairs because traction is important during stepping.
Bridge walkways, municipal service covers, drainage systems, utility access panels, and outdoor public works can use welded steel grating because it drains quickly and can be galvanized for corrosion resistance.
Heavy industrial sites use welded steel grating for platforms, maintenance floors, trenches, access routes, and equipment areas. Hot dip galvanized Type “W” grating is often selected where moisture, dust, heavy use, and outdoor exposure are expected.
| Application | Why Type “W” Welded Steel Grating Is Used |
|---|---|
| Industrial platforms | Strong flooring with drainage and ventilation |
| Walkways and catwalks | Lightweight structure with good load capacity |
| Drainage covers | Allows water flow while supporting loads |
| Stair treads | Provides durable access with anti-slip options |
| Bridge access | Handles outdoor exposure and reduces water accumulation |
| Heavy industrial sites | Suitable for demanding platforms, covers, and maintenance areas |
Type “W” welded steel grating is especially suitable for industrial flooring because it offers a strong welded structure, good open area, practical cost, custom fabrication, and several surface treatment options. For factory floors, maintenance platforms, elevated walkways, and drainage areas, these advantages are important in daily operation.
The welded connection between bearing bars and cross bars creates a stable grid. By choosing suitable bearing bar size and spacing, Type “W” welded grating can be used for light pedestrian access, medium-duty platforms, or heavy-duty industrial floors.
The open structure allows water, oil, snow, dust, and small debris to pass through. This makes welded steel grating useful in wet areas, outdoor platforms, washdown zones, water treatment facilities, and industrial process areas.
Compared with solid steel plate flooring, welded steel grating provides strength with less dead weight. This helps reduce load on supporting steel structures and makes installation easier in many platform and walkway projects.
Serrated Type “W” welded steel grating provides better traction in wet or oily areas. This is useful for industrial stairs, outdoor walkways, drainage covers, and platforms where workers may carry tools or materials.
Factory-made welded grating can be cut, banded, notched, drilled, and marked according to project drawings. This reduces installation time and helps panels fit around pipes, columns, tanks, equipment, and structural frames.
When carbon steel welded grating is hot dip galvanized after fabrication, the zinc coating protects the steel from corrosion. This makes it suitable for outdoor and industrial environments where untreated steel would rust quickly.
| Advantage | Practical Value |
|---|---|
| Welded structure | Provides stable and reliable industrial flooring |
| Open grid | Improves drainage, ventilation, and light transmission |
| Flexible specifications | Can be selected for different load and span requirements |
| Serrated option | Improves walking safety in wet or oily areas |
| Hot dip galvanizing | Improves corrosion resistance for outdoor service |
| Custom fabrication | Reduces site cutting and improves installation efficiency |
Correct installation is important for Type “W” welded steel grating. The bearing bars must be placed in the correct direction, the panel must be supported properly, and the fixing method must match the application. Poor installation can reduce load capacity, create noise, cause movement, damage coating, or create safety risks.
Grating clips are commonly used when panels need to be removable. Clips can secure the grating to the support structure without welding. This method is useful for maintenance platforms, drainage covers, walkways, and areas where panels may need to be lifted for inspection or cleaning.
Welding provides strong permanent fixing. It is often used for fixed platforms where panels do not need to be removed. For hot dip galvanized grating, welding will damage the zinc coating at the welded points, so the damaged areas should be repaired after installation.
Bolted installation is used for stair treads, framed covers, removable panels, and heavy-duty applications. Bolt holes can be made in the factory according to drawings. This method provides secure fixing while allowing future removal.
For trench covers and drainage covers, Type “W” welded steel grating is often installed into frames or support ledges. The frame must be strong enough and wide enough to support the panel. For vehicle or forklift areas, the frame design must match the load requirement.
Accessories may include saddle clips, bottom clips, bolts, nuts, washers, stair tread side plates, anti-slip nosing, toe plates, lifting holes, handles, hinge systems, and anti-theft fixing. The right accessories depend on whether the grating is used as a fixed floor, removable cover, stair tread, or heavy-duty access panel.
| Installation Method | Main Advantage | Suitable Use |
|---|---|---|
| Clips | Removable and easy to install | Walkways, platforms, maintenance access, drainage covers |
| Welding | Strong permanent fixing | Fixed industrial platforms and non-removable floors |
| Bolting | Secure and removable | Stair treads, framed covers, heavy-duty grating |
| Frame support | Good positioning and load transfer | Trench covers, drainage covers, municipal utility panels |
| Installation Check Item | Recommended Practice |
|---|---|
| Bearing bar direction | Install bearing bars so they span between supports |
| Support length | Ensure enough bearing area on beams, frames, or ledges |
| Panel fixing | Use clips, bolts, welding, or frames according to project need |
| Coating repair | Repair galvanized coating damaged by welding or site cutting |
| Panel gap | Control gaps to reduce movement, noise, and trip risks |
| Maintenance access | Use removable fixing where cleaning or inspection is required |
What does Type “W” welded steel grating mean?
Type “W” welded steel grating generally refers to welded bar grating, where cross bars are welded to bearing bars to form a strong open-grid panel. It is commonly used for industrial flooring, walkways, platforms, trench covers, drainage covers, stair treads, and outdoor access areas.
Is Type “W” welded steel grating good for outdoor use?
Yes, Type “W” welded steel grating is suitable for outdoor use when it is hot dip galvanized after fabrication. The zinc coating protects the steel from corrosion and makes the grating suitable for outdoor platforms, drainage covers, bridge walkways, water treatment plants, and industrial access areas.
How do I choose the right Type “W” welded steel grating size?
To choose the right Type “W” welded steel grating size, confirm the load requirement, clear span, bearing bar direction, bearing bar height and thickness, bearing bar spacing, cross bar spacing, panel dimensions, surface type, and installation method. For wet or outdoor areas, serrated hot dip galvanized welded grating may be preferred. For heavy loads or vehicle areas, deeper and thicker bearing bars are usually required.
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