Chang Gu Viet Nam logo CHANG GUViet Nam Co., Ltd
Quality inspection station

Quality control

Casting quality is not an inspection at the end. It is a chain of checks, each placed where a defect is still cheap to fix.

Equipment

What we check with

Spectrometer used to verify every heat before pouring

Optical emission spectrometer

Chemistry read from every heat before pouring. If the alloy is out of range, the metal never reaches your shells.

CMM measuring a machined casting

Coordinate measuring machine

Dimensional verification against your drawing for first articles, periodic in-process checks and final release.

Leak testing machine for pressure-carrying castings

Leak & pressure testing

Pressure-carrying parts are tested to the pressure and medium you specify, so shrinkage porosity is caught in our plant rather than on your line.

Control points

Where each check happens

Incoming materialRaw alloy and casting materials checked against supplier certificates
Wax patternVisual and dimensional check, pattern weight monitored per shot
ShellCoat count, drying time and shell condition confirmed before de-wax
MeltSpectrometer analysis of every heat before pouring
Raw castingVisual inspection for cold shut, inclusion and shrinkage; dimensional sampling
MachiningFirst-piece approval, in-process gauging, thread gauge check
FinalCMM report, leak test where applicable, surface and packing inspection
New part introduction

First article, then production

A new part is not released to volume until you have signed off a physical sample and its dimensional report. That sample is produced on the same tooling and the same route as production, not hand-made in a sample room.

  • Drawing and manufacturability review
  • Tooling manufacture and trial shot
  • First article with the reports you require, typically CMM and material certificate
  • Customer approval, then production release
  • Traceability by production order through casting and machining
Operator inspecting finished castings
Certification

ISO 9001:2015, certified by SGS

Our quality management system is certified to ISO 9001:2015 by SGS United Kingdom Ltd. The certificate covers manufacturing and processing of kitchen utensils, sanitary equipment, motor frames, elbows, stainless steel blanks, connectors, stainless steel water pipe valves and metal machinery spare parts.

Certificate numberVN26/00000039
Certification bodySGS United Kingdom Ltd
Valid19 January 2026 to 20 January 2029, subject to surveillance audits

Download the certificate (PDF)

Quality inspection station
Documentation

What ships with your order

Material certificate

Spectrometer analysis for the heat your parts were poured from.

Dimensional report

Measured results against the drawing features you nominate as critical.

Test records

Leak or pressure test results for fluid-carrying components.

Have a drawing? Get a casting quote.

Send a 2D drawing or 3D model with material, quantity and market. You get a manufacturability review and a price.

Start an RFQ