Custom Drawing Manufacturing OEM
Custom Drawing Manufacturing OEM & Contract Metal Fabrication Services
Contract manufacturing and OEM metal fabrication built strictly to buyer engineering drawings, CAD models (STEP, IGES, SolidWorks), and geometric dimensioning and tolerancing (GD&T) specifications. Production runs handle medium-to-heavy structural assemblies, machine frames, chassis bases, and precision weldments utilizing structural carbon steel, alloy steel, and stainless steel grades. Operations integrate plate cutting, robotic and manual arc welding, post-weld stress relieving, CNC machining of critical mating surfaces, and multi-stage quality verification to match industrial OEM Bill of Materials (BOM) standards.
Product Types
Medium-Sized Metal Welded Parts
Machine base frames, motor mounts, gearbox support brackets, reducer pads, and compressor skids.
Large Structural Steel Fabricated Parts
Portal frames, truss assemblies, H-beam/I-beam columns, and heavy industrial support structures.
Custom Sheet Metal Fabrication Parts
Enclosures, protective safety guards, heavy-gauge panels, and ducting assemblies.
Contract Welded Sub-Assemblies
Pre-machined weldments requiring tight positional tolerances and strict angular squareness.
Technical Specifications
|
Parameter |
Specification |
|
Dimensional Capacity |
Lengths up to 12,000 mm; widths up to 4,000 mm; heights up to 3,500 mm |
|
Maximum Weldment Weight |
Up to 15 metric tons per single weldment |
|
Dimensional Tolerances |
Linear tolerances to ISO 2768-mK; structural steel tolerances to ISO 13902 |
|
Machined Interface Flatness |
Within 0.05 mm over a 1,000 mm span |
|
Welding Processes |
GMAW (MIG), FCAW, GTAW (TIG), and SMAW |
|
Welder Qualifications |
Certified welders qualified to AWS D1.1, AWS D1.4, and ISO 9606 |
|
Visual Weld Inspection |
100% VT (Visual Testing) in accordance with AWS D1.1 |
|
Optional NDT Methods |
PT (Liquid Penetrant Testing), MT (Magnetic Particle Testing), and UT (Ultrasonic Testing) for critical load-bearing joints |
|
Surface Preparation |
Abrasive blast cleaning to ISO 8501-1 Sa 2.5 |
|
Coating Options |
Epoxy primer + polyurethane topcoat, hot-dip galvanizing (HDG) to ISO 1461, or custom RAL powder coating |
Materials & Fabrication Options
-
Carbon & Structural Steels
Q235B, Q355B/D/E (A572 Gr. 50), S355JR/J2, ASTM A36, and ASTM A516 Gr. 70.
-
Alloy Steels
42CrMo (AISI 4140), 20CrMnTi, and abrasion-resistant plates (Hardox 400/500 equivalent).
-
Stainless Steels
AISI 304, 304L, 316, and 316L.
-
Consumables
Low-hydrogen electrodes and matching wire-flux combinations selected to maintain base metal mechanical strength and impact toughness at sub-zero temperatures.
Application & Working Environment
Industrial Machinery
Original equipment manufacturing for heavy material handling, crushing, screening, and mixing equipment.
Power & Energy
Generator skids, compressor packages, and Balance of Plant (BOP) structural frames operating in high-vibration environments.
Infrastructure & Construction
Precast concrete production frames, structural bridge components, and heavy-duty industrial support skids.
Agricultural & Mining
Combine harvester sub-frames, heavy tillage toolbars, and slurry pump base frames subjected to dynamic cyclic loads.
Manufacturing & Quality Control
Cutting & Preparation: CNC laser cutting, high-definition plasma cutting, and heavy-duty plate sawing with edge beveling for full-penetration groove welds.
Fit-Up & Tack Welding: Precision modular welding tables and laser alignment tools to control distortion and maintain angular tolerances prior to final welding.
Post-Weld Treatment: Thermal stress-relief annealing furnaces to eliminate residual welding stresses in heavy-section components prior to finish machining.
CNC Machining Centers: Large-gantry CNC milling and boring machines to finish-machine mounting pads, bearing journals, and dowel pin holes in a single setup.
Dimensional Verification: CMM inspection and laser tracker measurement reports supplied with inspection documentation, raw material mill test certificates (MTRs), and weld inspection logs.
Customization & OEM Process
Drawing Review & DFM Analysis
Engineering review of 2D/3D CAD files (STEP/IGES/PDF) focusing on weld accessibility, distortion control, and cost-optimized manufacturability.
Prototype & Process Planning
Establishment of Welding Procedure Specifications (WPS), Procedure Qualification Records (PQR), and custom lifting/turning fixture design.
Pilot Production & First Article Inspection (FAI)
Fabrication of trial units with comprehensive dimensional, material, and weld integrity reports submitted for buyer sign-off.
Batch Production & Traceability
Serialized production tracking with permanent heat-number stamping and strict material lot traceability through final dispatch.
Packaging & Delivery
Protection
Machined surfaces protected with anti-rust corrosion inhibitors; exposed threads capped; sensitive apertures sealed against moisture and debris ingress.
Securing
Heavy weldments bolted or steel-strapped to certified fumigated wooden skids or fabricated steel transport pallets with designated crane lifting points.
Logistics
Containerized sea freight (20GP/40HC/Flat Rack) or break-bulk shipping dispatched from major ports with complete customs documentation, packing lists, and certificates of conformity.
FAQ
We're well-known as one of the leading oem welding fabrication manufacturers and suppliers in China. With a professional production team, we are able to meet the needs of the majority of our customers. Please rest assured to buy customized oem welding fabrication from our factory.