Welded Wire Mesh Quality Inspection Checklist

Inspection on this product is not about checking everything — it is about checking the handful of characteristics where a defect would survive installation, be invisible at the time, and fail later. Those characteristics are known, and they can be written into an inspection plan in an afternoon.

This is that plan for welded wire meshs.

Start from the failure modes, not from the drawing

The three defects that actually cost money on this product:

• 1. Weak weld that opens under load. weld current or pressure out of range — the joint holds hand tension but shears when the panel is stretched in service
• 2. Uneven or patchy zinc coating. poor surface preparation before galvanising, or wire already rusted at the weld; rust starts at the weld node
• 3. Wrong opening supplied. the line was set for a different specification and the tolerance was not checked against the order

Every inspection point below exists to catch one of those, or to catch the material and dimensional drift that produces them.

What a welded wire mesh must be checked against

low-carbon steel wire (Q195 / Q235), stainless steel wire (AISI 304 / 316) and galvanised wire is the specified material; the accepted grades are Q195 low-carbon steel wire; Q235 low-carbon steel wire; AISI 304 stainless wire; AISI 316 stainless wire; G60 hot-dip galvanised coating; G90 hot-dip galvanised coating. The governing standard is ASTM A1064 / A1064M, ASTM A185, EN 10223-4, BS 4483, EN ISO 1461, and the dimensions covered are mesh opening 6–150 mm (1/4 in to 6 in), wire diameter 0.5–5.0 mm, panel 1×2 m to 2.4×6 m; rolls and rigid panels both supplied.

Write those four facts at the top of the inspection plan. An inspector with no specification will measure what is easy to measure and pass the batch.

Incoming material check

1. Grade evidence: a mill certificate or a supplier declaration of grade is the minimum; on stainless, an XRF check on a sample settles it in minutes.
2. Material condition: straightness, surface defects, inclusions, delimitation or porosity visible before forming.
3. Pre-coating preparation: degreasing and pickling evidence where the finish depends on it — a coating over a contaminated surface fails as a whole.

Dimensional inspection

Against mesh opening 6–150 mm (1/4 in to 6 in), wire diameter 0.5–5.0 mm, panel 1×2 m to 2.4×6 m; rolls and rigid panels both supplied:

1. Measure the functional dimensions, not just overall size — the dimensions that make the part fit are the ones a supplier is most tempted to run loose.
2. Check the dimensions that govern assembly: hole patterns, thread forms, radii and interface faces.
3. On a sample of 5–10 pieces, measure with the same instrument the specification nominates. Two methods give two answers.

Finish and coating

electro-galvanised, hot-dip galvanised (G60 / G90) or PVC-coated over galvanised; stainless supplied plain or passivated

1. Measure coating thickness or coating mass on a sample per batch, at three points including a cut edge.
2. Look specifically at cut ends, drilled holes and bend radii — coatings fail there first.
3. Check for coating damage from handling and packing, which is a supplier process problem, not a product problem.

Mechanical and electrical tests

Your specification should name these; the inspection should confirm they were run and the records kept:

• wire tensile strength — confirm the certificate, the sample size and the date.
• weld shear / peel strength — confirm the certificate, the sample size and the date.
• coating mass per unit area — confirm the certificate, the sample size and the date.
• mesh opening and wire-diameter tolerance — confirm the certificate, the sample size and the date.
• panel flatness and squareness — confirm the certificate, the sample size and the date.

Per ASTM and ISO sampling practice, an inspector normally works to an AQL of 1.0 for major defects and 2.5 for minor ones unless your order says otherwise. Agree the definition of “major” in advance — on this product, anything affecting load path or coating integrity is major.

Pre-shipment inspection checklist

1. Quantity and part numbers against the packing list.
2. Dimensional sample per the plan above.
3. Coating or finish measurements recorded with photographs.
4. Functional test on an assembled sample where the product is supplied as a set.
5. Marking and labelling correct on the product, the bag and the carton.
6. Packing verified: panels strapped in bundles on wooden pallets with edge protection; rolls wrapped in anti-rust paper and woven fabric.
7. Test records and certificates present and matching this batch.
8. Container loading supervised, with seals recorded.

If a batch fails

Do not start with a price discussion. Start with three questions: how many pieces are affected, what is the containment, and what is the root cause. A supplier who can answer all three is a supplier you can keep. On this product the usual resolutions are a 100 % sort, a rework of the coating or finish, or a re-run — and the cost of the sort should be settled before the goods move, not after.

Related: the welded wire mesh specification guide is where the tolerances this inspection measures should be defined in the first place, and the supplier selection guide covers what to ask before you get to this stage.