A metal fabrication factory is a place where flat metal transforms into your product—without you having to juggle five different shops. Under one roof, we cut, punch, form, stamp, weld, machine, and finish components that end up in cars, home appliances, furniture, construction equipment, and automation systems. When a factory combines these processes, lead times collapse, middlemen disappear, and quality control stops being a blame game. At RongHai, we don’t just run machines. We study your drawing, run manufacturability analysis, and make sure the part that lands on your dock matches the part you approved—every time.

One roof. Thirty-plus major machines. A 315-ton hydraulic press for heavy forming. A 6 kW fiber laser that eats through 25 mm plate. Three CNC machining centers. Laser and MIG welding stations. CMM and mechanical testing in house. We process coil, sheet, plate, and tube in steel, stainless, aluminum, and galvanized stock. DFM feedback in 24 hours. Small prototype lots or 50,000-piece production runs—same discipline, same data.

Service Details

What Is a Metal Fabrication Factory?

A metal fabrication factory takes raw metal and turns it into a finished part or sub-assembly through cutting, forming, machining, welding, and finishing. It’s not a machine shop that only mills. It’s not a welding booth that only joins. A real fab factory owns the whole chain: it can blank a part on a laser, put the form in a press, add holes on a machining center, weld brackets on, and ship it ready to install. That integration is what saves you time, freight, and the headache of reconciling three different QC reports. At RongHai, our roots are in stamping, but we built out laser, CNC, and welding because customers kept asking “Can you also…?” Now the answer is almost always yes.

Complete Manufacturing Capabilities

Laser Cutting 

Our 6 kW fiber laser cuts mild steel up to 25 mm, stainless to 20 mm, and aluminum to 15 mm with nitrogen assist for clean, oxidation-free edges. Fiber lasers run faster and cost less per part than CO₂, especially on reflective metals. For tight-nesting runs, we program common-line cutting and part micro-tabbing to save you material. If your drawing can be cut and formed instead of stamped, we’ll tell you—and save you the tooling investment.

Stamping & Deep Drawing 

This is where three decades of die-making experience shows. Our presses range from 80 tons to a 315-ton hydraulic that handles materials up to 8 mm thick in progressive or transfer tooling. The bed size on the 315-ton is 2 meters by 1 meter, which means large panels, chassis bases, sink bowls, and deep-drawn housings go in one hit instead of two. One hit equals better concentricity and fewer secondary operations. We build the tools in-house, so when a die wears, we don’t wait for an outside shop; we grind, sharpen, or repair it within hours.

Bending 

A 160-ton CNC press brake with a 3.2-meter bed. That length lets us form long brackets, frames, and enclosure panels without multiple setups. We compensate for springback by measuring the first few parts on the CMM and tweaking the program. What you get is a consistent angle across the whole run, not a “close enough” bend that causes assembly problems later.

CNC Machining

Three machining centers with 920×530 mm travels and ±0.008 mm positioning. We machine castings, weldments, and stamped blanks that need bores, pockets, or threaded holes. Combining stamping and machining under one roof means we can blank a part on the press, then machine critical datums in the same building, under the same quality system.

Welding

We run MIG (CO₂) for structural steel, laser welding for cosmetic stainless and thin-gauge aluminum, and spot welding for sheet metal assemblies. Laser welding stands out: heat input is tiny, distortion is minimal, and the seams often need no grinding. For furniture, medical carts, and appliance housings, that means a clean, paint-ready surface straight off the fixture. We also have six MIG stations for heavy frames, racks, and structural weldments up to several meters.

Finishing & Assembly

Deburring, grinding, tapping, riveting, and even minor electromechanical assembly. Parts don’t leave here bleeding sharp edges. We can also coordinate powder coating, e-coating, anodizing, and galvanizing with qualified partner lines we’ve audited ourselves.

Materials We Fabricate

Carbon Steel (Q235, SPCC, 1018)

The workhorse. Cheap, strong, welds beautifully. Common in brackets, frames, structural parts. Watch out for rust; we apply a protective oil or suggest a finish.

Stainless Steel (304, 316)

Corrosion-resistant, food-safe. 304 for general use, 316 for marine or chemical environments. Stainless work-hardens, so our tooling and feeds need to be dialed in. Laser welding stainless produces a clean, silver seam without filler wire.

Aluminum (5052, 6061)

Lightweight, good thermal conductivity. 5052 forms well, ideal for enclosures and covers. 6061 machines easily but can crack when bent if the grain direction is wrong; we check that in DFM. Anodizing adds durability and color.

Galvanized Steel

Zinc coating provides corrosion resistance. Laser cutting galvanized requires proper fume extraction, and welding it needs good ventilation because of zinc fumes. We still weld it daily; we just do it right.

Copper & Brass

Excellent conductivity, often used in electrical busbars and decorative hardware. Lasers cut copper and brass with ease on our fiber machine; polishing brings out the luster.

Surface Treatment Options

We don’t run every finishing line in-house, but we manage the process so you get one quality gate.

Powder Coating 

Tough, even finish. Available in any RAL color. Good for outdoor and indoor. Watch for film thickness on threaded holes.

E-Coating (Electrophoresis) 

F-Uniform coating that reaches deep recesses. Often used on automotive stampings, brackets, and complex shapes where powder can’t get in.

Galvanizing (Hot-Dip)

Thick zinc layer for structural steel outdoors. Expect slightly rough surface; not for cosmetic parts.

Anodizing

Aluminum only. Hard anodizing for wear resistance, decorative for colored parts. We control the pre-treatment to avoid etching marks.

Wet Painting

For low-volume parts or specific colors where powder isn’t justified.

Passivation & Electropolishing 

Stainless steel; passivation removes free iron, electropolishing produces a mirror finish for medical or food equipment.

Industries We Serve

Our parts make it into cars, washing machines, air conditioner housings, supermarket shelving, logistics racks, medical carts, industrial enclosures, kitchen equipment, and renewable energy structures. We’ve stamped dishwasher door panels, welded chair frames, laser-cut mounting plates for solar trackers, and deep-drawn sink bowls. If a part needs to hold a structural load, survive vibration, or look clean enough for a retail floor, we’ve probably made something like it.

How We Control Manufacturing Quality

I’ll be blunt: you can’t inspect quality into a part after it’s made. You have to build it in. Here’s how we do that.

Incoming Material Inspection 

Every coil and sheet gets checked against the mill certificate. We measure thickness with a micrometer, run a quick spark test if anything feels off, and log the heat number. Material substitution is the number one cost-cutting trick in this industry. It doesn’t happen here.

First Article Inspection (FAI) 

Before a production run, we measure the first part on the CMM, dimensional by dimension, against your drawing. If one dimension drifts, we adjust the tool, the program, or the fixture. You get that FAI report in your inbox before we run the balance.

In-Process Checks 

Operators pull parts at defined intervals and check critical dimensions on a surface plate or height gauge. The frequency depends on the run size and complexity, but we never let a batch run blind for four hours without a check.

CMM & Mechanical Testing

Our CMM delivers micron-level verification of GD&T callouts. The tensile tester and hardness tester confirm that the material properties match the spec—not just the chemistry, but the actual mechanical values. A part that’s dimensionally right but made from annealed stock that should have been full-hard will fail in the field. We catch that.

Final Inspection & Packaging Check

Every shipment gets a final dimensional review, a visual check for surface defects, and a packaging inspection to make sure nothing shifts during transit. We take photos of the loaded crate and share them with you.

How We Reduce Manufacturing Cost

Lowering cost doesn’t mean cutting corners. It means working smarter.

DFM Feedback 

Within 24 hours of receiving your RFQ, we send back a manufacturability analysis. We’ll suggest alternative bend radii, grain direction adjustments, or a switch from milling to notch-and-bend. Often we can eliminate a secondary operation just by tweaking the blank geometry. Those changes can save 15-20% without touching material or tolerance.

Material Utilization

Our laser nests parts with common-line cutting where possible, and we group orders from different customers onto the same sheet gauge and material. You pay only for the metal used, plus a small kerf loss, because we maximize what that sheet gives.

Process Integration 

Instead of sending a stamped part to an external machine shop for tapping and reaming, we put it on our CNC. You save logistics, markup, and time. We also combine stamping and laser cutting when a part has internal features that are impractical to punch—one part, one PO, one lead time.

Packaging Optimization 

Nesting parts in custom corrugated trays or designing returnable racks for regular shipments can slash packaging cost and freight volume. We’ll engineer it if your volumes justify it.

Common Problems Buyers Encounter

Look, I’ve seen the same disasters on repeat for 20 years. Here’s what to watch out for.

Material Substitution 

A supplier quotes 304 stainless but ships 201 because it’s cheaper and looks similar. A year later, your parts rust. Ask for material certifications and, if you’re unsure, visit the shop and ask to see the raw stock. We’ll show you ours.

Tolerance Drift

The first article was perfect. By the thousandth part, burrs are growing, dimensions are walking, and nobody noticed. This happens when in-process inspection is skipped. A real factory measures at set intervals and records the data. Ask to see those records.

Welding Deformation

An amateur shop heats up a large frame, lets it cool unevenly, and now it’s a pretzel. We fixture parts tightly, sequence welds to balance heat, and use laser welding where possible to minimize the heat-affected zone.

Trading Companies Posing as Factories

You’re three layers away from production. When something goes wrong, the trader can’t solve it; they have to ask the factory who has to ask the foreman. Talk directly to the engineers. Visit the shop floor. A real factory has a factory video, a factory smell, and a factory floor you can walk on.

How to Choose the Right Metal Fabrication Factory

When you’re evaluating a supplier, don’t just look at the quote. Look at the capability.

Check the equipment list.

Does the shop have enough forming tonnage for your part thickness? Can their bending bed handle your longest flange? If a 200-ton press is their biggest, and your part needs 250 tons, they’ll either refuse it or try to do it in two hits and lose accuracy.

Ask about inspection.

“We do QC” means nothing. Ask “Do you have a CMM?” “Can I see a blank FAI report?” “How often do you pull parts during a run?” The right shop will have specific answers.

Review the DFM.

Send your drawing to three suppliers. One will quote it blind. One will point out impossible features. One will suggest three small changes that cut cost and improve performance. That third one is your partner.

Look at the floor.

A messy shop with uncoiled cables, oily floors, and unguarded presses is a quality accident waiting to happen. A tidy, well-lit shop signals discipline.

Ask about past work in your industry.

If you make refrigeration equipment, a supplier who stamps appliance parts already understands your cosmetic requirements, your tolerance for burrs, and your corrosion spec. That knowledge base speeds everything up.

Frequently Asked Questions

What materials can you fabricate?

We work with carbon steel, stainless steel (304, 316), aluminum (5052, 6061), galvanized steel, copper, and brass. Sheet, plate, coil, tube—we handle it all.

What is the maximum size part you can stamp?

Our largest press bed is 2000 mm × 1000 mm. For progressive dies, strip width up to 500 mm.

Can you handle large assemblies, not just individual parts?

Yes. We weld stamped components into sub-assemblies, add machined fittings, and ship them ready for your line.

What file formats do you need for a quote?

3D: STEP, IGES, or SOLIDWORKS. 2D: PDF or DWG with tolerances noted.

What is your typical lead time for tooling?

Simple blanking dies: 3-4 weeks. Progressive dies for complex parts: 5-7 weeks. Prototype tooling can be expedited.

Do you provide prototypes before full production?

Absolutely. We can cut and bend prototypes on the laser/brake or build soft tooling. You approve fit and function before we cut hard tooling.

What is your minimum order quantity?

Laser cutting starts at 1 piece. Stamping usually requires 1,000 pieces to amortize tooling, but we can run smaller lots with shared or modular tooling depending on part geometry.

How do you ensure consistency across a production run?

In-process inspection at defined intervals, data logged for critical dimensions, and final CMM spot-checks. No one-off “first article” and done.

Can you finish parts in-house?

We handle deburring, grinding, and some welding. We coordinate surface treatments—powder coat, anodize, galvanize—through long-term partner lines we’ve audited. You deal with one supplier.

Do you offer design assistance?

Yes. Our DFM service is free with every RFQ. We’ll suggest changes that reduce cost or improve manufacturability, and we can even help develop a new part concept.

What quality certifications do you hold?

ISO 9001:2015. Our quality system is audited annually.

What are your payment terms?

Typically 30% deposit with order, balance before shipment. For ongoing customers, we can negotiate open terms.

How do you package parts for overseas shipment?

Custom wooden crates with foam lining, VCI bags for bare steel, and palletizing per ISPM 15. We also design custom corrugated separators for painted parts.

Can you match a specific color for powder coating?

Yes. Provide a RAL number or a physical sample, and we’ll match it.

What if my parts arrive damaged or out of spec?

We document every shipment photographically. If a problem occurs, we’ll either replace the batch or provide a corrective action report and rework. We stand behind our work.

Do you accept small-batch orders for startups?

Yes. We work with hardware startups and small OEMs. Our laser and press brake can produce 50 or 100 units without tooling.

Can I visit your factory?

Any time. I’ll show you the floor myself. No appointment needed—well, maybe a day’s notice so I can be there.

Real manufacturing knowledge, no fluff. Read “Why Your Stamping Quote Is High (And How DFM Fixes It)” to understand cost drivers. “Laser Welding vs. MIG: When to Spend the Extra Dollar” helps you choose the right process. And “How to Audit a Fabrication Floor in 30 Minutes” gives you a checklist for your next supplier visit—straight from someone who’s been on both sides.