Every structural fabrication shop in New Zealand reaches the same point. The beamline is humming. Beams, columns, channel, all flowing through to layup. And the bottleneck has moved. The gussets, base plates, cleats, and connection plates are still being cut on a manual oxy bench or a small handheld plasma. Parts that should take minutes are taking the better part of a shift, and edge quality is forcing rework downstream at the welder.
If that picture matches your shop, this article is for you. The case for adding a CNC plasma plate cutter alongside an existing beamline is well established in larger NZ structural fabricators, the ones doing the hard yards on serious tonnage. Here is what that addition actually does, what it cuts, and how the two machines work together.
Two halves of structural fabrication
A modern structural shop produces two distinct families of parts.
The first family is linear members. Beams, columns, channel, angle, RHS, SHS. These come in standard mill lengths, get cut to length, drilled or punched for connections, and coped where they meet other members. A beamline is purpose built for this work, feeding stock, drilling, sawing, scribing layout marks for the welder. It is a transformation of long stock into precise structural members.
The second family is plate components. Gussets, base plates, cleats, splice plates, capping plates, end plates, stiffeners, web doublers. These are cut from sheet plate, typically in the 6 to 50mm thickness range, in shapes that range from simple rectangles to complex profiled parts with multiple holes and edge bevels. A beamline does not cut these. A plasma plate cutter does.
The two machines complement each other. The beamline owns the linear members. The plate cutter owns the plate components. Together they cover the full output of the shop without manual cutting being the rate limiting step.
What plate cutting actually produces
The list is longer than most shops appreciate when they first cost the bottleneck.
Base plates sit at the bottom of columns, transferring load to the foundation. Typically 20 to 50mm mild steel, often with anchor bolt hole patterns drilled or pre cut in the plate. Edge accuracy matters because the column footprint must align with the bolt cage in the slab. Get it wrong on site and you are grinding holes oversize while the concrete pour waits.
Gussets brace connections between members. Triangular, trapezoidal, or custom profiles. 8 to 25mm in most NZ work, with bolt hole patterns and clean edges for welding to both members. Volume is high. A single steel framed building can have hundreds of gussets.
Cleats connect secondary members to primary members. Beam to column cleats, beam to beam cleats, fin plates, web cleats. Typically 8 to 20mm, with bolt holes that must align with predrilled holes in the connecting member.
Splice plates join sections of the same member end to end, bolted on either side of the web or flange. Hole patterns must match the connecting member exactly, and edge alignment matters for the bolt clamp force to develop properly.
Capping plates and end plates close off hollow sections or cap the end of a column. 6 to 20mm typical thickness, often with weld preparation cut into the edges.
Stiffeners and web doublers strengthen webs in beams under high local load, bearing stiffeners over supports, intermediate stiffeners on plate girders. 6 to 25mm, often profiled to fit between flanges.
These parts are different from the linear members in three important ways. They are flat pattern parts cut from plate. They have hole locations that must match drilled patterns in connecting members. And their cut edges often need to be square or beveled for direct welding without secondary preparation.
What plate cutting does that the beamline cannot
Coping is a beamline strength, cutting a profile in the end of a beam to match the curve of a connecting beam or column. It is single axis, on the end of stock, geometrically constrained.
Plate cutting is a different problem. The cut path can be any 2D profile. The plate is sized to the part nest, not the part itself. Hole locations are arbitrary. Edge bevels for weld preparation are an option on every cut. Plate yield matters because plate is more expensive per kilogram than long stock.
Three plate cutting capabilities are worth highlighting for structural work.
Hole accuracy and concentricity. Connection plates with bolt patterns must match the drilled holes in the connecting member. Hypertherm’s TrueHole® technology, available on XPR systems running ProNest, delivers bolt ready hole quality on mild steel up to 25mm thick, with hole diameter to plate thickness ratios from 1:1 up to 2:1. That means a 25mm hole in 25mm plate, or a 50mm hole in 25mm plate, both bolt ready straight off the table without secondary drilling. Above 25mm, holes are typically drilled either on the plasma table with a drilling head or on a separate drill. Below 25mm, the plate cutter delivers ready to bolt plates rather than rough blanks that need hole work. TrueHole is automatically applied by the nesting software, so operators get the result without having to set anything up manually.
Bevel cutting for weld preparation. Structural plate above 12 to 15mm typically needs an edge bevel for full penetration welds. Cutting that bevel as part of the plasma cut, rather than grinding it on the bench afterwards, saves significant labour per part. A plasma system with an automatic bevel head cuts angles up to 50 degrees, including K bevels and Y bevels for complex weld preparations. For a structural shop running consistent weld prep volume, this is the single biggest output gain over manual plate cutting. See our proprietary technology page for the bevel head detail.
Tight nesting for plate yield. Plate is expensive. Nesting software arranges parts on plate to maximise yield from each sheet. Manual layout typically achieves 60 to 70 percent yield. Professional nesting software like ProNest routinely achieves 80 to 90 percent on complex nests. On structural plate work where a single shop may consume hundreds of tonnes of plate per year, the difference is material.
Power source, why XPR for structural
NZ structural fabrication shops typically run a regular plate thickness range of 6 to 40mm, with occasional jobs above that. The Hypertherm XPR series is the right power source class for that range.
The XPR170 suits shops where the regular work sits below 30mm mild steel. Production pierce to 40mm. Strong choice for general structural fabrication where the heaviest plate is occasional rather than constant.
The XPR300 is the most widely specified XPR for NZ structural fabrication. Production pierce to 50mm mild steel. Cuts 25mm at 4,500mm per minute with X-Definition® cut quality. Handles the consistent 20 to 40mm plate work that defines most structural shops, plus the occasional 50mm job. For most NZ structural fabricators, the XPR300 is bang on the right specification.
The XPR460 is specified for shops processing continuous heavy plate above 40mm. Production pierce to 64mm. More common in mining and heavy engineering than in mainstream structural work, but relevant for shops that do significant volumes of thick base plate or wear rated structural members.
For comparison, the XPR300 vs XPR170 article covers cut speed differences in detail. Powermax class power sources on mechanised installations work for shops cutting predominantly thinner material below 20mm, but for the 20 to 40mm range that defines most NZ structural plate work, an XPR class power source is the right call.
For shops doing high volumes of bolt hole work on connection plates, TrueHole capability is one of the strongest reasons to specify an XPR over a lower tier system. Powermax class systems on mechanised installations deliver good general cut quality but do not run TrueHole. For a structural shop where every gusset, base plate, and splice plate has a bolt pattern, TrueHole changes the secondary processing equation entirely.
The XPR sits inside a complete machine. Plazmax CutAce is the production grade unitised cutting system, heavy gantry, precision drives, full bevel head capability. Plazmax CutPro is the heavy duty configuration for shops running continuous high output cutting on long plate, the machine you spec when the plate cutter is going flat tack every shift. Both are NZ built and supplied with NZ technical support.
How the workflow integrates
The plate cutter sits alongside the beamline rather than replacing any part of it. A typical workflow in an NZ structural shop:
The 3D model in the structural detailing software (Tekla, Advance Steel, or similar) generates two output streams. Linear members go to the beamline as DSTV files. Plate components go to the plate cutter as DXF files, run through nesting software which arranges them on plate, generates the cut paths, and outputs the cut file to the plasma machine. ProNest reads DXF and DSTV directly.
The plate cutter and beamline operate in parallel. Plate parts come off the cutter in nested batches. Linear members come off the beamline. Both flow to the same layup and weld stations. The shop’s overall throughput is set by whichever stream is the slowest, and adding a plate cutter to a beamline only shop typically rebalances the bottleneck back to the welding side, which is where most shops want it.
NZ context
A plasma plate cutter is a capital investment that runs for ten years or more. Two NZ specific considerations matter for that timeline.
First, technical support on the ground. Plazmax has a technical team in New Zealand that supports both Plazmax built machines and Hypertherm equipped machines built by other manufacturers. If your existing or future plate cutter runs a Hypertherm power source, which most quality machines in this class do, support is on the tools locally regardless of who built the table.
Second, consumables held in NZ. Production plasma cutting on structural plate consumes electrodes, nozzles, and shields at a steady rate. Holding those consumables in NZ rather than waiting on transit from overseas is the difference between an unplanned downtime event lasting hours and one lasting days. See our consumables page for the Hypertherm range we hold.
Real NZ structural shops
A few examples of NZ structural fabricators running Plazmax plate cutting alongside their other capability.
GH Engineering is a Palmerston North steel fabrication firm running a CutPro HS. Their move to a Plazmax plate cutter was driven by the same combination most structural shops face, quality cut output for downstream welding, fast turnaround, and competitive pricing on plate components.
Enterprize Steel in Avondale runs a CutPro HS with an XPR300 VWI power source. Their previous cutting machine could not keep up, and the lack of service and support compounded the problem. The new machine delivered a 60 percent throughput improvement and the accuracy gain meant fewer rework cycles at the welder.
Dean Steel in Papakura runs the largest CutAce XL Plazmax has built. Their decision was driven in part by the value of NZ made manufacturing, support, service, and machine specification handled by a manufacturer they could pick up the phone to.
These shops are different in scale and product mix, but the common thread is that the plate cutter sits alongside their other plate handling capability rather than replacing it. The plate cutter is the answer to the plate component bottleneck, not a general purpose replacement for everything else.
Frequently asked questions
Do I need to replace my beamline to add a plate cutter?
No. The two machines do different work and operate in parallel. Most structural shops add a plate cutter alongside an existing beamline rather than replacing anything.
What plate thickness range should I spec for typical NZ structural fabrication?
Most NZ structural shops cut a regular range of 6 to 40mm mild steel, with occasional jobs above that. An XPR170 covers the lighter end of that range. An XPR300 is the most common specification for mainstream structural work and handles the full 6 to 50mm range with production pierce. An XPR460 is specified where continuous heavy plate above 40mm is the dominant work.
Can a CNC plasma plate cutter cut bolt ready holes without secondary drilling?
Yes, on mild steel up to 25mm thick using Hypertherm’s TrueHole® technology. TrueHole is a SureCut process that virtually eliminates hole taper and improves roundness, automatically applied by ProNest nesting software when an XPR or HPRXD power source is in use. Hole diameter to plate thickness ratios run from 1:1 up to 2:1, meaning holes from the same diameter as the plate is thick, up to twice that diameter, are all bolt ready off the table. Above 25mm plate, holes are typically drilled either on the plasma table with a drilling head or on a separate drill.
What is TrueHole and do I need it?
TrueHole® is a Hypertherm SureCut technology that produces bolt ready holes directly off the plasma table on mild steel up to 25mm thick. Without TrueHole, plasma cut holes typically have some taper and require secondary drilling or reaming for bolt fit. With TrueHole, the holes are bolt ready as cut. For a structural shop running connection plates with bolt patterns at any volume, TrueHole removes a significant secondary processing step and is one of the practical reasons to specify an XPR system over a lower tier power source.
Can a CNC plasma plate cutter cut weld ready bevels?
Yes. A plasma system fitted with an automatic bevel head cuts angles up to 50 degrees, including K bevels and Y bevels. For shops doing consistent full penetration weld preparation on structural plate, cutting the bevel as part of the plasma cut rather than grinding it afterwards is the largest single labour saving available.
How does plate cutting integrate with our existing detailing software?
Plate components export from structural detailing software (Tekla, Advance Steel, or similar) as DXF files. Nesting software like ProNest reads DXF directly, arranges parts on plate, and outputs the cut file to the plasma machine. The same model that drives your beamline can drive your plate cutter without manual rework.
Can Plazmax support a Hypertherm powered plate cutter that was built by another manufacturer?
Yes. The Plazmax NZ technical team supports Hypertherm equipped systems regardless of who built the table. Service, consumables, and parts are available locally for any Hypertherm equipped machine in NZ.
How long does a plate cutter typically last in a structural shop?
A production plasma plate cutter built to industrial specification runs for 10 years or more in continuous structural use. Power source consumables are wear items replaced regularly. The machine itself, drives, gantry, controls, is a long lived capital asset on the same depreciation cycle as a beamline.