A casting sourcing agent for India should understand foundry processes, material testing and typical casting defects, because many of them cannot be seen from the outside. The agent's value is in the checks on chemistry, structure and dimensions, not in finding a foundry name.
Castings are made by several routes, such as sand casting, investment casting and die casting, in iron, steel, aluminium and other alloys. Each route has its own strengths, tolerances and risks. The wrong match is expensive, because tooling is paid for early.
What an agent should be able to explain
- Which process suits your part, given its size, quantity, surface finish and tolerance.
- Which material standard applies and how the foundry proves it, through spectrometer results and a mill or melt certificate.
- Which defects matter for your use: shrinkage, porosity, cold shuts, inclusions and dimensional drift.
- Which non-destructive tests are used when needed, such as dye penetrant, magnetic particle or radiography, and who pays for them.
- Who owns the pattern or tooling, and where it stays.
Foundry checks during an audit
A foundry audit should look at melting and pouring control, moulding and core making, heat treatment if used, fettling and machining, and the testing lab. Ask the agent how it checks that the foundry makes the part itself rather than subcontracting it. The general scope of an audit is in what a factory audit should contain, and engineering specifics are in auditing an engineering factory.
Questions to ask before you hire
- Have you managed castings in my alloy and process, and what went wrong on the last difficult job?
- Who approves the pattern, and who checks the first castings? Ask for a first article inspection.
- How are samples taken for chemistry and mechanical tests, and who sends them to the laboratory?
- What sample size do you use for dimensional checks? See dimensional inspection.
- Do you take any payment from foundries?
Red flags
- A foundry that quotes without asking for the drawing's tolerances or the material grade.
- Test certificates that look identical across heats or batches.
- Refusal to let anyone watch the pour or the testing.
- Prices far below others for the same part, which can mean cheaper material or skipped steps.
- A trader presenting itself as the foundry; see trader or manufacturer.
A short worked example
You need 500 iron pump housings. The agent audits three foundries, checks the melt control and the machining stage, and has the first castings measured and sectioned before bulk is released. During production, samples are drawn for chemistry, and the finished lot is inspected and packed. The balance is paid after the report and the certificates match the shipment.
Mistakes buyers make with castings
A common mistake is paying for tooling without a clear agreement on who owns it. Write down that the pattern or die belongs to you, where it is kept, and that it will not be used for others. Photographs and a tooling register help.
Another is checking only dimensions. A casting can measure correctly and still have internal porosity or the wrong chemistry. Ask for chemical analysis from the actual heat and, where the use demands it, non-destructive tests or sectioning of sample parts.
A third is ignoring machining allowance and finishing. If the casting is machined later, the allowance has to be right, and a casting that is out of position wastes the whole piece. Ask the agent to check the first castings in a fixture or against the machining drawing.
Finally, check packing. Rough castings can rust in humid transit if they are not treated or wrapped, and heavy parts shift in crates. The loading should be supervised and photographed.
How we work
We work across India, so we arrange audits and inspections where the foundry is. We find and audit manufacturers, check samples and documents, have lots tested, and supervise production and loading. You pay the foundry directly, we take nothing from factories, and the fee is agreed in writing in advance. Engineering work sits under industrial machinery. Book a free sourcing review to start.