EXTREME System 28 Series

Nitrided welding tables for demanding applications
EXTREME System 28 Series welding tables are designed for intensive welding, assembly, and production work. Their main distinguishing feature is a steel tabletop subjected to a nitriding process, which increases surface hardness and wear resistance. A nitrided welding table prepared in this way performs well in demanding welding environments, where the working surface is regularly exposed to the movement of heavy components, scratches, high temperatures, and spatter.

System 28 uses 28 mm diameter holes and is primarily designed for clamping larger and heavier structures. By comparison, System 16 is used mainly for smaller and more precise components.

The EXTREME series combines a modular clamping system with increased tabletop surface durability. As a result, the table can be used both in single-unit production and during repetitive tasks that require accurate component positioning.
What does table nitriding involve?
Nitriding is a thermo-chemical treatment process during which the surface layer of the material is saturated with nitrogen. As a result, a hardened layer is formed on the steel surface, offering higher hardness and wear resistance than untreated material.

The nitriding process primarily affects the surface properties of the tabletop. It does not make the table entirely resistant to damage, but it helps reduce the effects of daily use. The nitrided surface wears down more slowly during the frequent moving of components, mounting of tooling, and cleaning of the table.

The key benefits of nitriding include:

higher surface hardness,
increased resistance to wear,
reduced susceptibility to scratches,
easier removal of some spatter,
extended durability of the working surface,
better corrosion protection,
longer retention of the tabletop’s functional properties.

Nitrided welding tables are a good solution for facilities where a standard steel surface wears out quickly due to intensive work.
Resistance to welding spatter and arc strikes
During welding, the table surface remains in contact with hot spatter and the electric arc. Welding spatter can adhere to the tabletop, settle in the system holes, and make the proper mounting of pins and clamps difficult.

A nitrided surface can reduce the adhesion of welding spatter and make it easier to remove. However, this does not mean complete resistance to welding spatter and electric arc strikes. The table still requires regular cleaning and proper operation.

In demanding welding conditions, particular importance is placed on:

systematic removal of spatter,
cleaning mounting holes,
avoiding heavy grinding of the tabletop,
preventing prolonged overheating of a single area,
monitoring the condition of the surface layer.

Proper maintenance limits the degradation of the nitrided steel layer caused by spatter, heat, and mechanical processing.
System 28 for large and heavy structures
System 28 is based on system holes with a diameter of 28 mm. They enable the mounting of pins, clamps, stops, squares, and other elements of modular tooling.

A regular grid of holes allows extending the functionality of the workstation and creating configurations adapted to a specific project. Accessories can be repositioned depending on the size, shape, and position of the workpiece.

System 28 provides:

precise clamping of heavy elements,
stable positioning of structures,
fast positioning of profiles, pipes, and sheets,
the possibility of working in multiple configurations,
repeatability during series production,
convenient changing of tooling,
high functionality of the workstation.

The hole system also facilitates replicating the same clamping layout when producing subsequent units of a structure.
Steel tabletop and precise working surface
The tabletop is the main working surface of the welding table. It transfers loads resulting from clamping, positioning, assembling, and processing workpieces. Therefore, when selecting a table, attention should be paid not only to its dimensions, but also to its flatness, tabletop thickness, supporting structure, and allowable load.

In a series designed for heavy-duty operation, the key factors are:

surface hardness,
durability and wear resistance,
tabletop flatness,
dimensional stability,
accuracy of hole manufacturing,
heat resistance,
strength of the steel structure.

Parameters such as steel grade, tabletop thickness, table height, or exact dimensions should always be checked in the specifications of a specific variant. This also applies to models with a surface area of 2400 × 1200 mm, a height of approximately 850 mm, a 100 mm pitch, or those made of S355J2+N steel.
Flatness and dimensional stability during welding
The precision of welding operations depends on maintaining the geometry of the working surface. Tabletop flatness directly affects workpiece positioning, clamping quality, and the accuracy of the finished structure.

It should be noted that nitriding increases the hardness and wear resistance of steel surfaces, but does not eliminate the risk of deformation. Excessive load, uneven heating, or prolonged exposure to high temperatures can affect the tabletop geometry.

Steel has a specific coefficient of thermal expansion, which is why the table structure should operate under conditions that account for heat effects. Proper thermal expansion does not imply complete immunity to localized overheating. Prolonged exposure to high temperatures can lead to stresses, deformations, and, in extreme cases, surface damage or component cracking.
Accessories and modular clamping system
A System 28 welding table can work with a wide range of accessories. System holes allow tooling to be mounted at selected points across the table surface, making it easy to adapt the workstation to the task at hand.

Among the most commonly used components are:

clamping pins,
welding clamps,
stops,
squares,
locating elements,
toggle clamps,
V-blocks,
pipe and profile mounts.

The pin is used to insert and lock compatible components into the holes. The clamp stabilizes the workpiece, the stop creates a reference point, and the square allows the structure to be set at the required angle.

The modular nature of the system allows the workstation to be expanded as production needs change. There is no need to build a separate assembly fixture for every new structure.
2D and 3D System 28 Welding Tables
A nitrided table can come in a 2D or 3D variant. The 2D construction features system holes primarily on the top surface of the tabletop and is designed for clamping components in a single main plane.

A 3D table features additional side surfaces with holes. This allows components to be clamped across multiple planes and enables the creation of more complex workstation configurations.

The choice of variant depends on the type of structures being fabricated. Simpler frames and flat assemblies can be processed on a 2D surface, whereas complex spatial projects require greater positioning capabilities.
Available models of EXTREME System 28 welding tables.
Various configurations of Series EXTREME System 28 tables are available in the POS-MET product range.

Most popular models:
1500 × 1000 mm welding table
Model available exclusively with a 25 mm thick tabletop, with a load capacity of 4,000 kg. It is suited for applications requiring maximum surface hardness and durability on a smaller workstation.
2000 × 1000 mm welding table
A universal nitrided table available with a 15 or 25 mm tabletop, with a load capacity of 4,000 kg — a solid choice for regular production and assembly of medium-sized structures.
2400 × 1200 mm welding table
Model with a tabletop available in a thickness of 15 or 25 mm, equipped with 4 legs and a load capacity of 4,000 kg. It is suited for structural fabrication requiring a large working surface and high tabletop resistance to heavy-duty use.
2990 × 1490 mm welding table
The largest and most durable model in the EXTREME Series. Available with a 15 or 25 mm tabletop, equipped with 6 legs, and offering the highest load capacity in the entire range at up to 6,000 kg — designed for the heaviest industrial structures.
How to maintain a nitrided tabletop?
A nitrided table is resistant to daily wear and tear, but its surface can still suffer damage. Degradation of the nitrided layer can result from heavy grinding, severe impacts, the use of improper tools, or prolonged localized overheating.

To extend the lifespan of a welding table, you should:

regularly remove welding spatter,
clean system holes,
avoid grinding directly on the tabletop surface,
avoid heavy impacts with heavy components,
do not exceed the maximum load capacity,
monitor flatness and surface condition,
protect the table from prolonged moisture.

Nitriding provides protection against corrosion and spatter adhesion to a greater extent than an untreated surface, but it does not replace proper maintenance. Damage to the surface layer can locally reduce its resistance.
Why Choose the EXTREME System 28 Series?
The EXTREME System 28 Series is designed for users who expect a durable, precise, and comprehensive workstation for welding tasks. The combination of the 28 mm hole system with a nitrided surface increases the tabletop’s resistance to heavy use and allows for convenient clamping of larger structures.

Key advantages of the series:

nitrided working surface,
higher surface layer hardness,
resistance to wear and scratches,
limited spatter adhesion,
modular System 28,
precise clamping,
durability and resistance in demanding conditions,
expandability with additional accessories,
high workstation functionality,
suitable for heavy structures.

A nitrided welding table helps maintain an efficient and accurate workstation during intensive production. To select the appropriate dimensions, tabletop thickness, hole pattern, and equipment, you should compare the technical parameters of the available variants in the EXTREME System 28 Series.