Hangzhou Chengyu Welding Equipment
Chengyu, in Xiaoshan, Hangzhou, builds automatic longitudinal and circumferential seam welders, positioners, H-beam gantries and custom welding stations. Send the full part drawing first. How the part is held, turned and reached by the torch decides the right station far more than seam length does.
杭州诚宇焊接设备有限公司
Hangzhou, Zhejiang, China
By WeldOrigin Editorial · Sources checked
In this profile
What Chengyu builds
Chengyu develops, designs, makes and services welding equipment from Nanyang in Xiaoshan, Hangzhou. Its introduction lists automatic longitudinal and circumferential seam machines, welding centres, CNC equipment, H-beam gantry equipment and positioners. The homepage breaks circumferential equipment into horizontal, vertical and profiling types, and adds pipe and flange machines and other dedicated stations.
Most of this range is built around a workpiece: a tube, a vessel shell, a beam or a flanged pipe. So Chengyu is a supplier for tailored automation and part handling, where the station is shaped to your part. Ask for references in your own industry and, if you can, a visit to the workshop that would build your machine.
A Xiaoshan government enterprise evaluation list names Hangzhou Chengyu under Nanyang. That entry helps you tie the seller on your quote to a real Xiaoshan firm. Machine safety and product quality need their own documents for your order.
Describe the seam path and how the part is held
For a longitudinal seam, give the weld length, section shape, joint preparation and where the clamps sit relative to the torch. Show how the part goes in and comes out of the station. For a circumferential seam, give the diameter range, length, mass distribution and the surfaces Chengyu can use to locate or drive the part. Mark any flange, branch or bracket that gets in the torch's way.
A drawing of the weld line alone often hides the feature that makes the job hard. Send the whole workpiece and ask Chengyu to show it sitting in the proposed fixture, with a note of what varies from batch to batch. If the part is neither round nor straight, ask how the motion and sensing will follow the shape. The profiling circumferential machines are the place to start that conversation.
Get the positioning right before the welding
Size a positioner for the full load and the way it sits during welding. Explain how the part is supported, whether it can move, and how much room it needs to turn. Ask which axes are powered, which are set by hand and how the operator reaches the loading and inspection points. Ask Chengyu for the rated load of the positioner it quotes, in writing.
With rollers or a rotary table, talk about the contact surfaces and the chance of slipping or wobbling. With a dedicated fixture, settle the clamping order, locating accuracy and how sizes are changed. These choices decide whether the torch can reach the seam all the way round. The power source is only one line of the quotation, so make sure handling and fixtures are itemised beside it.
Name the process and every part of the package
Because Chengyu covers several equipment types, ask the proposal to name the welding process and the matched power source, torch, wire feeder and controls. Give the material, thickness and acceptance requirement before you ask for a configuration. Say who supplies gas lines, backing, cooling and fume extraction at the installation.
Ask for separate lines for standard equipment, custom tooling, options and bought-in parts. Find out whether seam tracking or torch oscillation is included, how it is set up and how much incoming variation it can follow. A full equipment list and process sequence lets you set rival offers side by side and stops accessories going missing at delivery. For a thin-wall longitudinal seam that might suit TIG or microplasma, Eweld in Hangzhou builds automated stations of that kind and can take the same brief. The welding automation overview collects the cell-level questions both suppliers should answer.
Trial the hardest parts
Build a sample set with the worst torch access and the widest fit-up spread you expect. Measure the parts before and after welding so distortion counts toward acceptance. Watch the operator load, locate, clamp and remove every piece. A clip of the welding alone can hide slow preparation or awkward unloading.
Ask Chengyu to log the configuration and settings behind each accepted sample. If size changes matter to your business, run the cycle again after a changeover. Plan what happens when a weld fails or a part is loaded wrongly. You are buying a workflow that repeats, so judge the trial on finished, accepted parts.
Divide the work on a custom station
A custom station needs a clear line between Chengyu's equipment and your plant. Agree who supplies part drawings, trial material, utilities, lifting gear and the final layout. Set design review points before tooling is built, covering operation, maintenance and recovery from likely faults.
At handover, ask for manuals, electrical drawings, spare-part details and a backup of the accepted control settings. Run a factory acceptance and a separate on-site acceptance, and write down how shipping damage and later configuration changes are handled.
Confirm before ordering
Settle the commercial terms of this order on the quotation itself: delivery date, service travel, warranty and any conformity marks your market requires. Ask Chengyu to state the positioner load rating, which catalogue functions such as seam tracking are included on your station, and the acceptance plan for both the factory and your site. An older catalogue page or a local listing describes the company. The quotation and its attachments describe what you are buying.
Compare the published product scope
Product families serve different tasks. Use the configuration and acceptance questions to request a quotation for the same work.
On a small screen, scroll sideways to read all three columns.
| Product family | Published scope | Before selecting |
|---|---|---|
| Longitudinal seam welders [1] | Listed in the company introduction and catalogue as automatic seam machines. | Give seam length, clamp layout, joint preparation and how the part is loaded. |
| Circumferential and profiling welders [1] | The homepage shows horizontal, vertical and profiling circumferential equipment. | Send diameter, balance, locating surfaces and anything that limits torch clearance. |
| Pipe and flange machines [1] | Shown on the homepage among the dedicated applications. | Give pipe diameter range, flange layout and the weld positions you need. |
| H-beam gantry equipment [1] | Listed in the company introduction. | Send beam sections and lengths, and say how beams are fed and unloaded. |
| Positioners, welding centres and custom stations [1] | Chengyu lists positioners, welding centres, CNC equipment and customised stations. | State the full load, the motion you need, the fixtures and who integrates what. |
Buyer questions
Will a standard circumferential welder take any round part?
Check locating, load distribution, the drive contact and access around attachments on your actual drawing, then prove it in a trial with real parts.
How does a machine quote differ from a station quote?
A station quote can add fixtures, handling, controls, the power source and peripherals. Read the itemised list, since the headline description can cover either.
How should I accept a custom Chengyu station?
Use the agreed samples, include loading and a size change, run dimensional and weld checks, and keep a record of the accepted settings at the factory trial and again after installation.
Build a useful project brief
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Sources
Facts on this page come from the manufacturer's own publications and the public records listed below, checked on the date shown. Ask the manufacturer to confirm the exact configuration, documents and terms for your order in writing.
- Hangzhou Chengyu Welding Equipment · 杭州诚宇焊接设备有限公司，关于我们，公司简介
Manufacturer publication · Checked 2026-10-11
Chengyu's About page and homepage. They give the Xiaoshan location and list the seam welders, positioners, gantry, pipe and flange equipment.
- Xiaoshan government publication archive · Enterprise evaluation list
Public record · Checked 2026-10-11
A Xiaoshan administrative list that names Hangzhou Chengyu under Nanyang. Lets you tie the Chengyu name to its Nanyang address.