Tubular Frame

From heavy-wall carbon steel machine frames and equipment bases to sanitary 316L stainless steel medical chassis. Our turnkey custom tubular frame fabrication includes tube laser cutting, AWS-certified TIG/MIG welding, stress relieving, and CNC machining. Every process is executed entirely under one roof.

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Tubular Frame Weld Distortion Control

We both know heat bends metal. When executing large tubular frame fabrication, uncontrolled thermal expansion is the fastest way to ruin tolerances and misalign critical mounting points. At ShincoFab, we refuse to rely on luck or manual guesswork. We engineer the distortion out of the process. This is our strict protocol for managing the heat affected zone and maintaining geometric integrity.

Precision heavy-duty modular welding jigs for tubular frame fabrication

Heavy-Duty Fixturing

Before an arc is ever struck, your frame components are locked into massive, custom-machined welding jigs. These rigid fixtures are specifically designed to hold true position and resist thermal pull during the entire welding cycle.

Phased Skip-Welding

We don’t just weld continuously from end to end. We break complex frames down into logical sub-assemblies. Our AWS-certified welders utilize phased skip-welding (stitch welding) sequences to evenly distribute thermal input and strictly control the HAZ.

Thermal Stress Relieving

Welding traps internal residual stress. Left untreated, the frame will warp over time or during machining. We utilize thermal annealing (or vibratory stress relief) to stabilize the frame’s molecular structure before it hits the CNC mill.

Post-Weld CNC Machining

We do not rely on empty claims about having great welders. We utilize phased TIG and MIG welding combined with large format post weld CNC machining. This exact sequence guarantees your critical mounting pads and linear rail surfaces remain coplanar within 0.1mm.

Tubular Fabrication Capabilities & Equipment Specs

We don’t outsource the hard parts. By keeping cutting, bending, welding, and machining entirely within the ShincoFab facility, we maintain absolute control over quality, lead times, and dimensional accuracy. Here is what our floor is equipped to handle.

 

Precision CNC Tube Laser Cutting

We utilize multiaxis CNC tube lasers to process round, square, rectangular, and custom extrusions. This capability ensures burr free clean cuts, complex slotting, and precise fishmouth saddle cuts. Perfect joint fitups mean faster welding, less filler metal, and drastically reduced thermal distortion. Our engineering team fully supports tab and slot self fixturing designs.

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Multiaxis CNC tube laser cutting complex slots on steel extrusions
Precision CNC rotary draw bending on heavy steel tubing

CNC Tube Bending and Forming

Capabilities include CNC rotary draw bending and roll bending for sweeping curves. We handle everything from thin-wall sanitary tubing to heavy-wall structural carbon steel, maintaining strict control over the Minimum Centerline Radius (CLR) without wall thinning or wrinkling.

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AWS Certified Structural Welding

Our welding stations are manned by AWS-certified personnel.
  • TIG (GTAW): Engineered for high-purity, cosmetic, and welded frames for clean rooms. Back-purging available for semi-conductor, pharmaceutical industry, and food-grade frames.
  • MIG (GMAW): High-penetration structural welds for carbon steel frames for heavy duty industrial equipment. Designed for maximum load-bearing capacity and rigid equipment bases.
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High purity precision TIG weld bead on metal frame
Large-envelope CNC mill machining a heavy welded structural frame

Post Weld CNC Machining

Tolerance stack-up is the enemy of frame assembly. After welding and stress-relieving, your entire frame goes onto our large-envelope CNC mills. We machine all critical mounting pads, linear rail channels, and bolt holes after the frame is welded. This guarantees your components bolt on perfectly parallel and coplanar, every single time.

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Primary Alloys We Weld Machine and Stock

Matching the exact welding process to the correct metallurgy is critical. We enforce strict material segregation on our shop floor to prevent cross contamination such as carbon steel dust embedding into stainless parts. All raw materials arrive with full traceability and certified mill test reports. We actively stock and fabricate the following core alloys.

Segregated raw metal tubing stock for custom frame fabrication

Sanitary 304 and 316L Stainless Steel

The baseline for any stainless steel tubular frame used in biomedical equipment and semi-conductor applications. We don’t just weld stainless, we finish it. We provide cosmetic grinding, mechanical polishing (up to #4 or #8 mirror finish), and electropolishing to eliminate bacterial harbor points and meet strict cleanroom protocols.

Heavy Duty A500 Structural Carbon Steel

The backbone of industrial manufacturing. Ideal for building heavy gauge precision structural frames, CNC machine bases, and rigid support structures. We expertly manage the thermal distortion on massive carbon weldments and finish them with durable, industrial-grade powder coating or wet paint.

High Strength 6061 T6 and 5052 Aluminum

When mass reduction is critical. We utilize AC-TIG welding to break through aluminum oxide layers, delivering deep-penetrating, porosity-free welds specifically for aluminum tubular frames for aerospace, transportation, and automated robotic gantries.

Extrusions & Modular Systems

Need to integrate welded rigid frames with modular strut systems? We regularly fabricate hybrid frames compatible with customer-specified extrusion systems (e.g., Unistrut, 80/20) for flexible mounting and routing options.

Single Source Fabrication From Raw Tube to Finished Frame

Managing a separate tube cutter, a welding shop, a CNC machinist, and a coating facility is a logistical nightmare. This fragmented supply chain inflates your freight costs, delays lead times, and triggers endless vendor disputes when tolerances fail. We provide procurement teams with a single point of accountability.

Complete In House Manufacturing Operations

You issue one Purchase Order (PO), and we handle the rest. We cut, bend, weld, machine, and finish entirely within our controlled facility. No subcontracting the hard parts. No losing track of your project in transit between vendors.

Industrial Finishing and Protective Coating

We don’t ship raw, rusting steel. Your frames can be finished to your exact environmental requirements. We offer in-house or strictly managed industrial powder coating, wet painting, anodizing (for aluminum), or specialized protective plating (such as zinc or electroless nickel).

Direct to Assembly Line Delivery

When our assembly-ready frames hit your receiving dock, they are ready for your assembly line. All machined holes are deburred, tapped, and masked during painting. No manual drilling on your floor. No costly rework.

Engineered Custom Crating for Freight Protection

The biggest tragedy in fabrication is a perfectly machined 10-foot frame getting bent out of tolerance by a careless forklift driver or rough freight transit. We don’t just wrap your frame in plastic. We design and build custom wooden crates with engineered structural supports for large weldments, ensuring your tight tolerances and dimensional accuracy survive the journey.

Large single source metal fabrication facility for custom tubular frames

Dimensional Verification and Exact Tolerance Proof

Quality isn’t an empty promise, it’s a documented data point. When a large structural frame is out of tolerance, your entire assembly line halts. We eliminate that risk. Before any tubular frame leaves our dock, its geometric integrity is strictly verified and documented. We don’t guess. We measure.

Dimensional verification using portable CMM FARO arm on metal part

Large Envelope FARO Arm and Laser Metrology

We don’t rely on tape measures and squares. To verify complex hole patterns, critical mounting pad coplanarity, and overall geometry of your custom chassis frames, we utilize advanced portable coordinate measuring machines (CMM) like FARO® ScanArms. You get the exact dimensions you engineered.

ISO 9001 Certified and AWS Code Compliance

Our entire facility operates under an audited ISO 9001:2015 quality management system. Furthermore, every structural weld is laid down by AWS D1.1 (Carbon Steel) and AWS D1.6 (Stainless Steel) certified personnel, ensuring structural integrity meets strict industrial and safety codes.

Complete MTR Traceability and FAI Documentation

We know your QA and procurement departments require a strict paper trail. Every shipment can be accompanied by comprehensive First Article Inspection (FAI) reports, Certificates of Conformance (CoC), and raw Material Test Reports (MTRs) to guarantee metallurgical and dimensional integrity.

Stop Over-Engineering Your Tubular Frames. Let Us Help You Cut Costs.

Before you lock in your BOM, send us your 3D model. Our manufacturing engineers will review your design, identify tolerance stackup risks, and suggest standard material swaps to reduce your fabrication costs by up to 20% while maintaining absolute structural integrity.

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Frequently Asked Questions

Before you hand over your proprietary CAD files or commit your procurement budget, you need absolute certainty. We know you are actively evaluating our machining limits, our tolerance controls, and our engineering support. We don’t hide behind sales jargon, and we won’t route your technical questions through account managers who don’t know how to read a print. Below are the direct, unfiltered answers to the most critical fabrication questions we receive from mechanical engineers and buyers every day.
What is the largest tubular frame you can fabricate and machine?
We are equipped to handle large-scale structural weldments. Our maximum physical envelope for fabrication, stress relieving, and post-weld CNC machining is 144″ (L) x 72″ (W) x 48″ (H), with a maximum lifting capacity of 10,000 lbs (5 Tons). If your design fits within these parameters, we can build it and machine it.

We don’t try to defeat physics; we engineer around it.
While we use heavy-duty fixturing and phased skip-welding to minimize initial Heat-Affected Zone (HAZ) distortion, the ultimate precision comes from our post-weld machining process.
After stress relieving, the welded frame is transferred to our large-format CNC mills, where all critical mounting pads and linear rail channels are machined in a single setup to maintain alignment across key features.
This approach allows us to achieve coplanarity and parallelism on critical machined surfaces to typically +/- 0.1 mm, depending on overall frame size, geometry, and material condition.

Yes. We specialize in tubular frames for medical devices and high-purity 304/316L stainless steel fabrication. Beyond standard TIG welding, we offer complete weld discoloration removal, cosmetic blending, and mechanical polishing up to a #4 (brushed) or #8 (mirror) finish. Whether you need polished tubular frames for labs or chemical passivation (per ASTM A967) for strict cleanroom protocols, we eliminate microscopic bacterial harbor points.

Absolutely. Our engineering team reviews every CAD file before production. We frequently help customers save 15% to 30% on material costs and accelerate lead times by weeks through strategic design adjustments. A common example is switching expensive custom metric extrusions to readily available local standard gauge structural tubing while maintaining complete structural integrity.

Submit Your Frame Design for DFM Review & Firm Pricing

Stop guessing on lead times and costs. Send us your frame design. Our fabrication engineers will immediately review your CAD/STEP files for manufacturability, material availability, and tolerance stack-up. You will receive a detailed, no-nonsense quote within 24 hours.

Whatsapp

+86 13392819510

Address

Building 1, No.8, Second Street, Huangjiang Town,
Dongguan City, Guangdong Province

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ShincoFab specializes in precision sheet metal fabrication, delivering high-quality custom metal solutions to clients worldwide with advanced technology and expert craftsmanship.

Contact Info

  • Building 1, No.8, Second Street, Huangjiang Town, Dongguan City, Guangdong Province
  • Whatsapp: +86 13392819510
  • [email protected]

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Ready to start your sheet metal project? Contact the ShincoFab team to discuss your custom fabrication requirements. We support you through design, manufacturing, and delivery—at every stage.

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