Zhejiang Jiafeng Electrical & Mechanical Co., Ltd. manufactures high-precision welding parts using robotic laser welding, CO₂/MIG welding, TIG welding, and automated stud welding — all executed in-house. Our sheet metal manufacturing capabilities feed directly into our welding cell, giving you a seamless, zero-handoff supply chain from raw sheet to finished weldment.
Welding parts (also called weldments or welded components) are structural or functional assemblies formed by permanently joining two or more metal pieces through a fusion or pressure-welding process. According to the American Welding Society (AWS) Welding Handbook, Vol. 1 (9th ed., 2001), welding is defined as "a materials joining process that produces coalescence of materials by heating them to the welding temperature, with or without the application of pressure, or by the application of pressure alone, and with or without the use of filler material." The resulting joint carries mechanical loads, seals enclosures, or conducts electricity as a single, monolithic structure.
In industrial manufacturing, welding parts range from small precision brackets (welded from 0.5 mm stainless sheet) to heavy structural frames (welded from 20 mm carbon steel plate). Quality standards — including ISO 5817 Welding — Fusion-Welded Joints in Steel, Nickel, Titanium and Their Alloys — Quality Levels for Imperfections and AWS D1.1 Structural Welding Code — Steel — define the acceptance criteria that govern every joint Jiafeng produces.
Our robotic welding cell — described in detail on our sheet metal manufacturing page — supports four primary welding processes, each selected to match the material, thickness, and joint quality requirements of your welding parts.
| Process | Equipment / Power | Material Thickness | Typical Applications | Governing Standard |
|---|---|---|---|---|
| Laser Welding (LBW) | 3,000 W robotic laser cell | 0.3 – 6 mm | Stainless enclosures, medical casings, cosmetic panels | ISO 13919-1; EN ISO 15614-11 |
| CO₂ / MIG Welding (GMAW) | Robotic CO₂ cell, 1,800 × 2,300 mm bed | 1 – 20 mm | Structural frames, heavy steel cabinets, machine bases | AWS D1.1; ISO 5817 Quality Level B/C |
| TIG Welding (GTAW) | Robotic TIG station | 0.5 – 10 mm | Aluminium alloy parts, food-grade equipment, precision sub-assemblies | AWS D1.2 (Al); ISO 5817; EN ISO 9692-1 |
| Automated Stud Welding | Auto stud welder, 1,500 × 2,500 mm bed | Sheet ≥ 1.5 mm (base) | PCB mounting bosses, panel assembly, fastener integration | ISO 14555; EN ISO 13918 |
Correct joint design is the foundation of a reliable welding part. The table below is aligned with ISO 9692-1 Welding and Allied Processes — Types of Joint Preparation — Part 1: Manual Metal Arc Welding, Gas-Shielded Metal Arc Welding, Gas Welding, TIG Welding and Beam Welding of Steels (2013). Jiafeng's design-for-manufacture (DFM) review recommends the optimal joint type during the quotation stage — a service available to all OEM/ODM customers.
| Joint Type | ISO 9692-1 Symbol | Groove / Preparation | Typical Thickness | Strength Characteristics |
|---|---|---|---|---|
| Butt Joint | 1.1 – 1.7 | Square, single-V, double-V, single-U | 0.5 – 20 mm | High tensile load; used in pressure vessels, structural frames |
| T-Joint (Fillet) | 2.1 | No preparation for fillet; J-groove for full penetration | 1 – 20 mm | Most common in sheet metal enclosures, brackets, frames |
| Lap Joint | 3.1 | Overlapping plates, edge or plug welds | 0.5 – 6 mm | Good shear strength; used in thin sheet assemblies |
| Corner Joint | 4.1 | Open or closed corner; fillet inside/outside | 0.5 – 10 mm | Box enclosures, cabinet shells, cosmetic corners |
| Edge Joint | 5.1 | Parallel edges, flanged or unflanged | 0.3 – 3 mm | Light structural; sealing edges on thin panels |
ISO 5817:2014 Welding — Fusion-Welded Joints in Steel, Nickel, Titanium and Their Alloys (Beam Welding Excluded) — Quality Levels for Imperfections defines three weld quality levels. Jiafeng meets Level B (the highest) for critical welding parts such as medical equipment housings and semiconductor equipment frames, and Level C as standard for structural weldments. All weld quality is backed by our certified quality system and CMM final inspection.
| ISO 5817 Level | Description | Max. Undercut (t ≤ 3 mm) | Max. Excess Weld Metal (h) | Typical Applications |
|---|---|---|---|---|
| B — Stringent | Highest quality; tightest imperfection limits | ≤ 0.5 mm; max 5% of t | h ≤ 1 mm + 0.1b; max 3 mm | Medical, semiconductor, aerospace frames |
| C — Intermediate | Standard quality for most industrial weldments | ≤ 1 mm; max 10% of t | h ≤ 1 mm + 0.15b; max 4 mm | Power cabinets, telecom racks, automation frames |
| D — Moderate | Adequate for less critical load-carrying joints | ≤ 1.5 mm; max 15% of t | h ≤ 1 mm + 0.25b; max 5 mm | General structural, non-critical machine bases |
Source: ISO 5817:2014, Tables 1–9. Symbols: t = nominal material thickness; b = weld width; h = height of excess weld metal.
Not all metals weld equally well. Jiafeng's material engineers evaluate carbon equivalent (CE), as defined in EN 1011-2:2001 Welding — Recommendations for Welding of Metallic Materials — Part 2: Arc Welding of Ferritic Steels, before selecting preheat temperatures and filler metals. Our precision machining team supplies machined sub-components that integrate directly into weldments when hybrid fabricated parts are required.
| Material | Common Grades | Weldability | Recommended Process | Preheat Requirement | Post-Weld Treatment |
|---|---|---|---|---|---|
| Cold-Rolled Steel | SPCC / DC01 / 1008 | Excellent | CO₂/MIG, Laser | None (CE < 0.35) | Powder coat or zinc plate |
| Stainless Steel 304 | SUS304 / 1.4301 | Very Good | TIG, Laser | None (low CE) | Passivation (ISO 16048) |
| Stainless Steel 316 | SUS316 / 1.4401 | Very Good | TIG, Laser | None | Passivation, electropolishing |
| Aluminium 5052 | A5052P / 5052-H32 | Good | TIG (ER5356 filler) | None — clean & deoxidise | Anodising optional |
| Aluminium 6061 | 6061-T6 / 1.3206 | Good (T4 preferred) | TIG, MIG (ER4043 filler) | None — T4 temper if possible | Stress-relieve + anodise |
| Galvanised Steel (GI) | SGCC / DX51D+Z | Moderate | MIG (low current); fume extraction required | None | Touch-up zinc spray (ISO 1461) |
Carbon equivalent (CE) formula per EN 1011-2: CE = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. All values are indicative; actual parameters confirmed at DFM review stage.
ISO 17635:2016 Non-Destructive Testing of Welds — General Rules for Metallic Materials provides the framework for selecting NDT methods based on material, thickness, and weld type. Jiafeng applies the following inspection methods to guarantee each welding part meets the agreed quality level before shipment. Results are documented and provided with every order upon request.
| Inspection Method | Standard | Detects | Application | Jiafeng Equipment |
|---|---|---|---|---|
| Visual Inspection (VT) | ISO 17637 | Surface cracks, undercut, overlap, spatter | All welds — first-line inspection | CCD Vision System (±50 µm planar) |
| Dimensional / CMM | ISO 10360-2 | Distortion, weld shrinkage, position error | Precision weldments requiring tight geometry | CMM: E = (1.9 + 3L/1,000) µm |
| X-Ray / Fluorescence (XRF) | ASTM E1032; RoHS / REACH | Elemental composition; restricted substances | Material verification; export compliance | X-Ray Analyser: 10–20 ppm, RSD < 10% |
| Tensile / Destructive Sampling | ISO 4136; AWS B4.0 | Weld joint tensile strength, elongation | Weld procedure qualification (WPS/WPQR) | Tensile Tester: Load accuracy ±1% |
| Salt-Spray Corrosion Test | ISO 9227 | Coating adhesion failures at weld seams | Coated / plated weldments | 96–128 h neutral salt spray chamber |
The breadth of Jiafeng's in-house capabilities — from laser cutting to electromechanical integration — means your welding parts can arrive fully assembled, tested, and surface-treated rather than as raw sub-components requiring further supplier involvement.
| Industry | Typical Welding Parts | Process | Quality Level (ISO 5817) | Surface Finish |
|---|---|---|---|---|
| Power & Energy | Switchgear frames, busbar enclosures, transformer housings | CO₂/MIG, Stud | Level C | Zinc plate + powder coat |
| Medical & Healthcare | Diagnostic imaging shells, surgical trays, infusion pump housings | Laser, TIG | Level B | Passivation (SS) / electropolish |
| Semiconductor & Electronics | Wafer-handling frames, cleanroom shields, vacuum chamber parts | Laser, TIG | Level B | Passivation / hard anodise |
| Industrial Automation | Robot cell guarding, conveyor frames, PLC cabinet bases | CO₂/MIG, Laser | Level C | Powder coat (RAL colour) |
| Telecom & Networking | Base-station shelters, 19″ rack chassis, antenna mounts | CO₂/MIG, Stud | Level C | Zinc plate (SECC) |
| New Energy / EV | EV charging station housings, battery pack frames, solar inverter enclosures | Laser, TIG (Al) | Level C/B | Ceramic conversion + powder coat |
Our ordering process is designed to eliminate ambiguity and compress lead times. The same factory that cuts, bends, and forms your sheet metal also welds, finishes, and inspects your welding parts — with optional electromechanical assembly at the end of the line.
| Step | What You Provide | What Jiafeng Delivers | Typical Lead Time |
|---|---|---|---|
| 1. Inquiry | 2D/3D drawings (DXF, STEP, PDF) or sample part + quantity | DFM feedback, process recommendation, budget estimate | 1–2 business days |
| 2. Formal Quotation | Approved drawings, material spec, quality level (ISO 5817), surface finish | Itemised quote with WPS reference, schedule, Incoterm options | 3–5 business days |
| 3. Prototype | PO / deposit | First-article part + CMM report + visual inspection photos | 5–10 business days |
| 4. Production | Approved first-article sign-off + balance payment | Batch welding parts, full QC, packed per spec | 7–20 business days |
| 5. Shipment & Docs | Delivery address, Incoterm preference | COO, material certs, inspection report, packing list | EXW / FOB Ningbo / CIF worldwide |
What is the difference between a welding part and a stamped part?
A welding part is an assembly of two or more metal pieces permanently joined by fusion or pressure welding. A stamped part is formed from a single flat blank pressed by a die. For complex geometries that cannot be made from one piece, welding is the preferred route. Jiafeng produces both — see our full sheet metal process capabilities.
What welding standards does Jiafeng certify to?
Our welding operations are governed by ISO 5817 (quality levels), ISO 9692-1 (joint preparation), ISO 14555 (stud welding), AWS D1.1 (structural steel), and AWS D1.2 (aluminium structures). Weld procedure specifications (WPS) and procedure qualification records (WPQR) per EN ISO 15614 are available for critical projects. Contact our engineering team for documentation packs.
Can you weld aluminium welding parts?
Yes. We weld aluminium alloys including 5052 and 6061 using robotic TIG welding with ER5356 or ER4043 filler wire per AWS A5.10. Pre-weld oxide removal and post-weld anodising are both available in-house. Our precision machining team can also supply machined aluminium sub-components for hybrid weldments.
What is the minimum order quantity for welding parts?
There is no minimum order quantity. Our CNC-driven processes require no hard tooling for most weld fixtures, making single-prototype orders cost-effective. Volume pricing applies from 50 pieces upward. Discuss your project on our contact page.
Can Jiafeng deliver welding parts with full electromechanical assembly?
Absolutely. Our mechatronics integration team assembles wiring, PCBs, sensors, actuators, and control systems directly into the welded enclosures and frames we manufacture. You receive a fully tested, ready-to-deploy product instead of loose sub-components.
Request a Quote for Custom Welding Parts
Provide your drawings or samples — our engineering team responds within 24 hours.
Get a Free Quote →Related services: Sheet Metal Manufacturing · Precision Machining · Mechatronics Integration · OEM/ODM
