FSW Supplier Audit: What Overseas Buyers Should Verify
Table of Contents
- What Should You Prepare Before an FSW Supplier Audit?
- What Machine Checks Matter Most in an FSW Supplier Audit?
- What Should a Live FSW Test Weld Prove?
- How Do You Verify FSW Tooling and Process Control?
- What Should You Do With Your FSW Audit Findings?
- What Questions Do Overseas Buyers Ask About FSW Supplier Audits?
- Do I really need a factory visit, or can I qualify a supplier remotely?
- How many sample welds are enough before placing an order?
- What matters more, the machine brochure or the WPS/PQR?
- How should an overseas buyer handle language and time-zone differences during an audit?
An FSW supplier audit should begin before you enter the factory, with your alloy, thickness, joint design, and production rate on the table. Those four numbers decide which machine frame, spindle, fixture, and pin tool the supplier must demonstrate. I have led or reviewed FSW supplier evaluations for more than fifteen years, and the qualified suppliers do not hide behind a certificate wall. They show the test weld, the tooling records, and the inspection data without being asked. This checklist covers the evidence overseas buyers should collect before committing to a machine, a production line, or a turnkey FSW program.
What Should You Prepare Before an FSW Supplier Audit?
Send the supplier a one-page weld brief before the visit. Include material grade and temper, thickness range, joint type, weld length, required quality class, annual volume, and any post-weld machining or leak requirement. If you are welding 7075 or 6061, write the target tensile strength and elongation, not just “good weld”. A supplier that asks about fixture access, tolerances, and expected cycle time is already thinking in production terms.
- Define the weld requirement: alloy, temper, thickness, joint configuration, weld length, annual quantity.
- Define acceptance limits: tensile strength, elongation, leak rate, surface finish, distortion envelope.
- Request the correct platform: gantry for wide panels, C-type for compact parts, heavy-load for deep single-pass welds.
This preparation narrows the visit very quickly. Without it, you will see a generic machine demo that proves only that the spindle turns.
What Machine Checks Matter Most in an FSW Supplier Audit?
Start on the shop floor, not in the meeting room. Ask to see the machine you are likely to buy, or one in the same capacity class. The frame should have enough stiffness to hold axis position while the spindle pushes the tool into the workpiece. On a light C-type machine, a 30 kN Z-axis force capacity is a typical bench reference. On a heavy-load gantry machine for 100 mm aluminium, you should see 200 kN capacity and a hydraulic-cooled spindle.
| Evidence to request | What a capable supplier shows | Red flag |
|---|---|---|
| Axis accuracy data | Laser interferometer or ballbar report for X, Y, and Z | Catalog-only accuracy figures |
| Z-axis force under load | Force trace from a real weld, not idle motion | No force recording available |
| Spindle thermal duty | Torque-speed curve and cooling method | Spindle rated only by peak power |
| Frame inspection records | Maintenance log, backlash check, alignment records | No machine history on the shop floor |
| Safety and guarding | CE documentation, interlocks, cable management | Exposed tooling during demonstration |
These checks matter because a machine that cannot hold position under load will produce inconsistent weld depth. I have seen buyers accept a micrometer-level positioning spec on paper, only to find the frame deflected at full axial force and weld depth wandering across the part. The audit should include a loaded test, not just a rapid traverse.
If your audit includes dissimilar aluminium to steel or copper, <Customized Dissimilar Material Welding Manufacturers in China> covers the tooling and process-window evidence a supplier should show before quoting an integrated line.
What Should a Live FSW Test Weld Prove?
Ask for a live weld on your alloy or the closest available grade. The demonstration should run on a fixture that mimics your part, with the same clamping and backing arrangement. Watch the start and exit points, the flash, the surface quality, and the weld length. A clean start and a keyhole at the exit are acceptable for a conventional tool. For closed-loop or sealed parts, ask for a retractable pin or bobbin tool demonstration.
The sample needs to be inspected, not just shown. Request tensile test bars, macro sections, or leak test results, depending on the application. A supplier that offers only a visually good weld is not demonstrating process capability. I have seen a visually clean weld pass a quick glance and then fail macro inspection because the tool path had not mixed the oxide layer completely. That is why the inspection evidence matters.
If your program involves a sealed enclosure, leak rate, or a dissimilar material joint, confirm the exact tool configuration before finalizing your BOM. Send your part geometry and acceptance limits to [email protected] and we will specify the tooling and machine axis configuration.
If your program uses spot welding, <Refill Friction Stir Spot Welding (RFSSW)> covers why a filled exit hole changes the flatness and strength checks you should request on the coupon.
How Do You Verify FSW Tooling and Process Control?
The pin tool is the consumable that decides weld quality and cost per meter. Ask how many meters a pin can weld in your alloy before rework, and how the supplier tracks wear. Compare standard pin tools, retractable pins, bobbin tools, and stationary shoulder options. The correct answer depends on your joint. A lap joint on 1 mm sheet needs a different shoulder than a 20 mm butt weld.
- Conventional tool: open linear joints and ordinary butt welds
- Retractable tool: closed contour welds where the exit hole must be removed
- Bobbin tool: hollow profiles without backing support
- Stationary shoulder: thin-wall parts needing low heat input and no flash
Process control is less visible than the floor plate but more important than the catalog figures. A capable supplier should record force, torque, temperature, and axis position during welding, and be able to show the trace. On an automated line, ask to see the HMI process database and how parameters are called up for each product. If the machine only logs spindle speed and travel speed, you are buying a motion platform, not a welding process.
<AEE provides customer with optional features FSW tool> shows why pin features should be confirmed during the audit rather than treated as a post-order option.
What Should You Do With Your FSW Audit Findings?
A machine that stops a year after installation creates more cost than a higher initial price. Before you close the audit, check how the supplier handles process support, spare parts, remote diagnostics, and operator training. Ask for the documentation package: WPS and PQR samples, machine maintenance schedule, spindle and tooling service intervals, and installation requirements. Check whether the supplier has field service capacity in your region or a clear remote-support procedure. Ask how spare parts are shipped and whether the machine has a documented maintenance schedule. These items show up in the first unplanned stop, not at the factory acceptance test.
Send your part number, alloy, thickness, annual volume, and required weld quality to [email protected] or call +86 18325808715. We will confirm which machine platform and tooling match the process, and arrange a sample weld before you commit.
What Questions Do Overseas Buyers Ask About FSW Supplier Audits?
Do I really need a factory visit, or can I qualify a supplier remotely?
No. A remote audit works if the supplier can share live video of the machine running, force and torque data logs, and inspection records from a similar material. It does not work when you need to feel the rigidity of the frame or watch the operator set up a fixture. I have seen remote audits reduce travel cost when the buyer already has defined requirements. If the part is high volume or safety critical, plan at least one visit for the sample weld and final quality review.
How many sample welds are enough before placing an order?
It depends on the part risk and the number of joint types. For a single butt weld on 6061, one well instrumented weld coupon with tensile and macro results may be enough. For an EV battery tray with multiple joint types and leak requirements, require five to ten coupons covering corner paths, start exits, and clamp variations. The supplier should also run a short production simulation, not just one perfect sample.
What matters more, the machine brochure or the WPS/PQR?
Many buyers treat the WPS/PQR as an administrative file, but that misses the point. The PQR shows a qualified process with measured parameters. A brochure lists machine capacities. Ask for the PQR coupon from the same alloy family and joint configuration, and compare the recorded spindle speed, travel speed, and axial force to your target. If the supplier cannot show a relevant PQR, do not accept a brochure as evidence.
How should an overseas buyer handle language and time-zone differences during an audit?
In supplier visits I have led, language and time-zone issues create more risk in quoting than in welding. The technical documentation should be in English, with drawings, manuals, and service records available at the audit. Ask for a named project engineer who will handle the program after order. If the supplier cannot commit to that, you may still get a good machine but you will fight for support later. Before you make a supplier decision, share your part number and alloy with [email protected] and we will confirm which machine and tooling should be demonstrated.
If you’re interested, check out these related articles:
AEE provides customer with optional features FSW tool
Refill Friction Stir Spot Welding (RFSSW)
AEE attend 13th International Symposium on FSW in Kyoto, Japan on 21 – 23 May 2024