Welding fixtures and checking gauges for seat frame parts

What this page is, and is not

A seat frame part does not survive contact with production without being held and checked. Somewhere between "the drawing looks fine" and "the first 500 parts are in the box", someone has to build the fixture that holds the part for welding and the checking gauge that proves the welded part matches the drawing.

This page explains how Yaxin handles that work for the wire and tube seat-frame parts we manufacture. One boundary first, because it is the honest one: we are a parts manufacturer, not a standalone fixture-selling shop. Fixtures and gauges are prepared as part of making your parts to your drawing. If you need a gauge for a part we do not make, we are the wrong supplier and will say so.

Why fixtures decide whether the part can launch

For a welded wire or tube seat frame part, the fixture is not an accessory. It is where several failure modes are either prevented or baked in.

A bracket welded in a poor fixture shifts. A weld nut welded without restraint ends up rotated. A tube sub-assembly clamped at the wrong points springbacks out of tolerance after welding heat. The checking gauge then either catches the drift at the end of the line, or the drift reaches the buyer's incoming inspection. Fixtures and gauges are the difference between finding those problems on our floor and finding them on yours.

That is why fixture and gauge questions belong at RFQ stage, not after price is frozen. A quotation that ignores the fixture has not quoted the part; it has quoted the easy half of the part.

What Yaxin prepares

For parts in our public scope (wire forming φ2–φ14 mm, tube processing φ8–φ52 mm), the manufacturing route can include welding fixtures, checking gauges and inspection support. Welding capacity behind those fixtures includes 20 argon arc welding machines, 2 projection welding machines and 4 spot welding machines, alongside the site's existing welding robot cells.

Simple validation fixtures and gauges can be made quickly by 3D printing. The purpose is speed at the stage where the buyer needs to check a design or a process decision, not a full production gauge: a first article can be held, welded and checked against a simple gauge days before a hardened production gauge would exist. That compresses your validation cycle, and it lets both sides find out early whether the part definition itself is stable.

Production-level fixtures and gauges for the launched part follow the buyer's requirement: who owns the gauge design, which datum scheme it checks, how restraint points map to the drawing, and whether the gauge record forms part of the PPAP submission. These are questions we ask at RFQ, because the answers change both cost and lead time.

How fixture and gauge cost appears in the quotation

Yaxin's public quotation principle separates the lines: part processing cost, tooling or fixture and gauge amortisation, and outsourced surface treatment where applicable. The fixture line is visible, not absorbed.

This matters more than it sounds. When fixture cost is hidden inside a lump sum, three things go wrong: you cannot compare suppliers, you cannot see why the price changes when annual volume changes, and you cannot tell whether the supplier has actually thought about the fixture at all. A visible line is also an audit trail: if the gauge requirement changes at PPAP stage, the quotation can change honestly instead of silently.

Ask for the three-line quotation format with fixture and gauge cost visible →

What to tell us at RFQ

For a seat-frame wire or tube part with fixture and gauge needs, send:

• PDF drawing with datum scheme and weld callouts, plus STEP, DWG or DXF for 3D geometry;
• tube diameter, wall thickness and material grade, or wire diameter and material;
• restraint points and functional mounting points, if the drawing marks them;
• whether a checking gauge is expected, and who owns the gauge design;
• whether the gauge record is part of the PPAP submission;
• weld inspection requirements, including whether destructive weld penetration reporting is expected;
• annual volume, SOP timing and sample deadline;
• surface treatment requirement (we state plainly that this is outsourced when required);
• PPAP expectation, if any.

On that last point, our public line stays honest: we prepare and submit PPAP to buyer requirement, but we have not yet made a PPAP submission directly to an overseas buyer. Raising PPAP at RFQ stage, including what the gauge and fixture records must contain, is cheaper for both sides than discovering the gap at nomination.

Inspection behind the gauge

The gauge checks geometry. Behind it, Yaxin runs in-house tensile testing, torque fatigue testing and weld penetration analysis (destructive testing). For the parts we quote, weld penetration reports can be issued part number by part number on request.

The acceptance criteria always belong to the buyer's drawing, referenced standard or customer-specific requirement. We do not publish a house penetration number, because a universal number would imply we weld to our own acceptance limit instead of yours. If your drawing sets a penetration figure, telling us at RFQ stage prevents a late requirement from changing the weld schedule, cycle time and sometimes the fixture design after the price has been frozen.

Sample timing

Wire formed samples can be as fast as 3 working days. Welded assemblies, seat frames and tube parts can be as fast as 10 working days. Those are sample possibilities, not launch promises: drawing release, material, fixture need, gauge need and inspection requirement all change the answer. A quick 3D-printed validation fixture is one of the ways the first end of that timeline gets compressed.

Why this page exists

Most fixture and gauge content on the internet is written by dedicated fixture shops selling to everyone. Most seat frame supplier pages never mention the subject. This page sits in the gap where our buyers actually live: a seat-frame wire or tube part, made to drawing in China, where the fixture and gauge plan is part of the quotation and the launch, not an afterthought.

Questions from buyers planning the fixture and gauge package

Send us the part drawing.

Send the part drawing, annual volume, gauge and fixture expectation, inspection requirement and PPAP expectation through the RFQ form. Yaxin replies within 3 working days with either a quotation path or the specific missing information needed before a quotation can be made.