Shanxi HongKai Forging Co., Ltd. specializes in manufacturing premium Weldoflange products" target="_blank">products with integrated production capabilities spanning forging, heat treatment, machining, and comprehensive quality testing. Our enterprise-level solutions feature specifications ranging from DN15 to DN4000, pressure ratings up to Class 2500, and compliance with multiple international standards including ASME B16.5, EN1092-1, and DIN. With three department workplaces and free import-export rights, we provide prevalent channeling association arrangements for requesting mechanical applications worldwide.
A Weldoflange is a special branch outlet fitting that combines a welded branch outlet and a flange connection into one integrated component.
Compared with a standard weldolet, a weldoflange provides a ready-to-use flanged end for bolted connection. Compared with using a separate weldolet plus flange, it can reduce welding work, installation space, and alignment problems.
Weldoflanges are commonly used for connecting valves, instruments, branch pipelines, and equipment nozzles to main pipelines.

| Standard | Type | Class / Pressure Rating | Size Range | Material Options |
|---|---|---|---|---|
| MSS SP-97 | Weldoflange / Flanged Branch Outlet | Class 150-2500 | NPS 1/2”-24” | ASTM A105, A182, A350 |
| ASME B16.5 | Flanged Outlet Connection | Class 150-2500 | NPS 1/2”-24” | Carbon Steel, Stainless Steel |
| ASME B16.47 | Large Size Weldoflange | Class 75-900 | Customized | Carbon Steel, Alloy Steel |
| EN / DIN | Customized Weldoflange | PN6-PN100 | DN15-DN600 | Carbon Steel, Stainless Steel |
| JIS | Flanged Branch Outlet | 5K, 10K, 16K, 20K | DN15-DN600 | SS400, SUS304, SUS316 |
| Custom Drawing | Non-standard Weldoflange | Customized | Customized | Customized Materials |
| Sealing Surface | RF, FF, RTJ, Custom Face | - | - | - |
| Coating | Black Paint, Anti-rust Oil, Galvanizing, Epoxy | - | - | - |
Additional Specifications:

| Material | Grade |
|---|---|
| Carbon Steel | ASTM A105, Q235, S235JR, ASTM A350 LF2 |
| Alloy Steel | ASTM A182 F1, F5, F9, F11, F12, F22, F91 |
| Stainless Steel | ASTM A182 F304, 304L, F316, 316L, 321 |
| Duplex Steel | F51, F53, F55, S31803, S32205, S32750 |
| Nickel Alloy Steel | Inconel 600, Inconel 625, Incoloy 825, Hastelloy C276 |
| Copper Alloy | CuNi 90/10, CuNi 70/30 |
| Custom Material | According to customer drawings and project requirements |

Weldoflange Dimension Drawing
| Dimension Item | Description |
|---|---|
| OD | Outside diameter of flange end |
| ID | Inside bore diameter |
| Thickness | Flange face or outlet wall thickness |
| Ring Diameter | Diameter of flange ring section |
| Handle Length | Outlet body length / branch extension length |
| Handle Width | Outlet neck width / outlet diameter reference |
| Bolt Hole | Bolt hole quantity and diameter |
| BCD | Bolt circle diameter |
| Sealing Face | RF, FF, RTJ, or customized sealing surface |
Integrated Branch and Flange Design
Weldoflange combines the reinforced branch outlet and flange connection into one compact component.
Reduced Welding Work
Compared with using a separate outlet fitting and flange, weldoflange can reduce welding operations and installation time.
Convenient Bolted Connection
The flange end allows valves, instruments, equipment, or branch pipelines to be installed and removed easily.
Reliable Sealing Performance
Accurate sealing face machining helps reduce leakage risk in branch pipeline systems.
Strong Reinforced Structure
The forged outlet body provides reliable reinforcement for branch connections under pressure and temperature changes.
Multiple Standard Options
Products can be manufactured according to MSS SP-97, ASME, EN, DIN, JIS, and customer drawings.

Oil and Gas Pipelines
Used for reinforced branch connections in oil and gas transmission pipeline systems.
Petrochemical Plants
Suitable for process pipelines requiring flanged branch outlets and stable sealing performance.
Chemical Processing
Stainless steel and alloy weldoflanges are suitable for corrosive and hazardous media.
Power Generation
Applied in steam, cooling water, fuel gas, and auxiliary pipeline systems.
Refinery Systems
Used for valve connections, instrument connections, and branch pipeline outlets.
Industrial Equipment Connection
Suitable for connecting equipment nozzles, branch pipelines, gauges, valves, and flow instruments.

Comprehensive Fabricating Capabilities
We coordinated manufacturing, warm treatment, machining, testing, and bundling beneath one roof. You get steady quality control all through the whole generation process.
International Standards Compliance
Our products meet ASME, EN, DIN, JIS, and GOST standards. You can specify the exact requirements for your regional applications with confidence.

Extensive Estimate Run
From DN15 to DN4000, we cover essentially all mechanical necessities. Your ventures advantage from single-source obtainment convenience.
Quality Affirmation
Progressed testing offices guarantee each product meets details. You get certified items with total traceability documentation.
Global Trade Involvement
Our items serve markets over Europe and the Americas. You work with demonstrated providers who get it worldwide quality expectations.
Competitive Preferences
Prevalent quality, competitive estimating, secure bundling, and quick conveyance combine to back your extend timelines and budgets.


Q: What is a Weldoflange?
A: A weldoflange is a reinforced branch outlet fitting with an integral flange connection end.
Q: What is the difference between Weldoflange and Weldolet?
A: A weldolet usually has a welding outlet end, while a weldoflange has a flange end for bolted connection.
Q: What is the difference between Weldoflange and Nipoflange?
A: Both are flanged branch outlet fittings. Weldoflange emphasizes welded branch reinforcement, while nipoflange usually refers to a nipple-style outlet body with a flange end.
Q: Can Weldoflange be customized?
A: Yes. OD, ID, thickness, outlet length, bore size, bolt holes, sealing face, material, and coating can be customized.
Q: What standards are available?
A: MSS SP-97, ASME, EN, DIN, JIS, and customer drawings are available.
Ready to enhance your branch pipeline connections with premium Weldoflange solutions? Contact kevin.zhao@hkflange.com for technical specifications and competitive quotations today.
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