Vietnam's Heavy Fabrication Capacity: An Honest Assessment for Buyers

Most writing about sourcing from Vietnam is written to sell sourcing from Vietnam. This one tries not to be. If you are evaluating the country for heavy welded fabrication, you need to know where the capability is real, where it is thin, and which jobs you should not send here at all.

The genuine strengths

Labour cost on labour-intensive work

Heavy fabrication is hours under an arc. Skilled welding and machining labour in Vietnam runs substantially below coastal China and far below the US or Western Europe. On a weldment where fit-up and welding are 35–45% of the cost, which is most of them, that gap survives a lot of friction.

It matters most on complex weldments with many joints, and least on simple plate-heavy pieces where you are mostly buying steel.

A real industrial base, not a startup

Vietnam is a substantial steel producer and a net steel exporter, with established shipbuilding, oil and gas fabrication, and structural steel sectors. The welders, the cranes and the plate supply exist. This is not a country where the capability has to be created.

Port proximity

The industrial zones around Ho Chi Minh City, Ba Ria–Vung Tau and Hai Phong sit close to deep-water ports. For oversize cargo, where the inland road leg is the hard part, that is a genuine structural advantage over inland Chinese shops, see out-of-gauge and breakbulk shipping.

Export documentation competence

Shops in the established export zones handle certificates of origin, ISPM 15 timber certification and mill cert packages as routine. This is not universal, but it is common enough that it should not be a differentiator you pay a premium for.

Where the capability thins out

This is the part that matters more, and it is the part sourcing sites leave out.

Very large machining envelopes

Welding capacity considerably exceeds machining capacity. Shops with 20- to 50-tonne cranes are not hard to find. Shops with a gantry mill that can face a 6 m weldment in one setup are much rarer, and they are booked.

If your part needs a large single-setup machining operation, the shortlist is short and the lead time is longer. Ask for table size and travel, not just crane capacity.

Long stress-relief ovens

Same problem, same cause. An oven over about 12 m is uncommon. This is one of the main reasons split-and-bolt design comes up so often in this market, it turns an impossible piece into two ordinary ones.

Consistent documentation discipline

Welding quality in the better shops is genuinely good. The paperwork trailing it is more variable. Shops accustomed to domestic work may weld correctly and be unable to produce, six weeks later, the weld map naming who welded which joint to which procedure.

This is the single most common gap, and it is the one that catches buyers with a serious QA function. It is also fixable, it is an administrative problem, not a skills problem, but it has to be specified and verified rather than assumed.

Specialised codes and certifications

ASME stamps, NQA-1 for nuclear work, EN 1090 execution classes for CE-marked structural steel, these exist in Vietnam but in a handful of shops, not across the market. If your work needs one of them, the population of qualified suppliers is small and priced accordingly.

Very heavy single lifts

Above roughly 50 tonnes as a single piece, the field narrows sharply and moves toward the shipbuilding and offshore yards, which are a different kind of supplier with a different cost structure and different minimum order expectations.

Where you should not source here

Straightforwardly:

• Anything urgent. Eight to twelve weeks plus ocean freight is the honest range for a multi-tonne frame. If you need it in three weeks, source domestically and pay for it.
• Simple, plate-heavy pieces with low labour content. You are paying freight and duty on steel to save a small number of hours. The arithmetic rarely works, and for US buyers in 2026 the duty position makes it worse, see Section 232 and imported steel frames.
• Work under content requirements. Federally funded US infrastructure and similar programmes have domestic content rules that no sourcing arrangement resolves.
• Single prototypes where you expect several design iterations. The communication round-trip and the shipping make iteration slow. Prototype near home, produce here.

The tariff position, stated plainly

For US buyers in 2026, Section 232 applies at 50% on steel articles, and Vietnam pays it. It is not a Vietnam-specific penalty, the same measure applies to most origins, so switching countries does not avoid it, but it is also not the tariff advantage that some sourcing copy still claims.

We would rather say that at RFQ stage than have your broker say it after the vessel sails. The full treatment is in Section 232 and imported steel frames.

For EU, Japanese, Korean, Australian and Singaporean buyers the picture is different and generally more favourable. Check your own position rather than reading across from the US one.

How to read a supplier’s claims

A few practical filters:

• “ISO 9001 certified” tells you there is a documented quality system. It tells you nothing about whether anyone can weld. Ask for welding procedures and welder certificates instead, see AWS D1.1 in plain language.
• “50-tonne capacity” usually means the main fabrication bay. Ask for capacity by bay, and ask where the machining happens.
• Photographs of impressive equipment. Ask when it was last used, and for a job it was used on.
• “We export to the US and EU”: ask for a recent shipment, the destination, the Incoterm, and who handled the documentation.
• A very fast quote on a complex drawing. Either they are very good, or they have not read it. Ask what they think the hard part is. The answer is informative.

Why a sourcing desk exists at all

The capability in Vietnam is real but unevenly distributed, and a shop’s website tells you essentially nothing about its crane, its oven or its machining envelope. The work of matching a drawing to a shop is physical: someone has to have been in the building.

That is what we do, and it is why we do not own a factory. A fabricator with one set of equipment will tell you your part fits it. We would rather tell you which of several shops it fits, and occasionally that it fits none of them and you should build it closer to home.

Shops that want to be on that list can apply to the network; the vetting is a shop visit, not a form.

A reasonable way to start

1. Send one real drawing, not a hypothetical
2. Ask for a quote with the Incoterm fixed, see Incoterms for heavy fabrication
3. Build the landed cost model including duty
4. Compare it honestly against a domestic quote for the same scope
5. If it wins, run a trial job sized so a failure is survivable

If it does not win, that is a useful answer too, and it takes a week to find out rather than a quarter.

Send a drawing and we will come back within 24 business hours, including, where it applies, the reason not to.