Why a Machined Weldment Takes Ten Weeks and Not Three

Published September 21, 2026. How we research this.

A buyer sees a machined weldment as one purchase. A fabricator sees eight or nine operations, two or three of which may happen in somebody else’s building.

That difference is why a ten week quote on a part that looks like three weeks of work is usually honest.

A realistic breakdown

For a mid sized machined weldment, say a 2.5 m frame in S355 with bores and machined faces, stress relieved and painted:

Stage	Typical elapsed time	In house?
Material procurement	1 to 4 weeks	No, mill or stockist
Profile cutting and preparation	2 to 5 days	Usually yes
Fit-up and tacking	2 to 5 days	Yes
Welding	3 days to 2 weeks	Yes
Weld inspection	1 to 3 days	VT yes, UT and RT often no
Stress relief	3 days to 2 weeks	Often subcontracted
Machining	1 to 3 weeks	Yes, if they machine
Coating	3 days to 2 weeks	Usually subcontracted
Final inspection and packing	1 to 3 days	Yes

These are illustrative ranges rather than a promise from any shop, and they overlap less than people expect because most of these steps are strictly sequential.

The three real risks

Plate availability. A36 in common thicknesses is on the shelf. A514 in 60 mm, a wide plate in a specific width, an impact tested grade or abrasion resistant plate in a large size may not be. This is the most common reason a quoted lead time slips, and it is outside the fabricator’s control.

Ask at quote time whether the material is in stock or on order. It is a one line question and it reframes the whole schedule.

Subcontracted queues. Stress relief, galvanising and radiography are frequently bought in. Your part joins a queue in a business you have no relationship with. A shop that owns its own oven has a real schedule advantage and it is worth asking about directly.

The rework loop. A rejected weld is grind out, re-weld, re-inspect. A part that moves in machining is a re-setup or a scrapped frame. Neither appears in the plan and both appear in the actual delivery date. This is why the distortion control and stress relief decisions are schedule decisions as much as quality ones.

What compresses well

Material. Expediting works if a stockist has it. Designing around a common grade and thickness works better.

Welding. Overtime and a second shift help. There is a limit, because interpass temperature control and weld sequencing do not respond to more welders on the same part.

Machining. Priority slots exist and cost money.

Starting earlier. The single most effective compression. Release the cutting of the plate parts while the machining detail is still being finalised, if the structure is stable. Many shops will do this on a partial release.

What does not compress

Stress relief. The soak is what it is. An hour per 25 mm is physics, not scheduling.

Coating cure. Paint systems have recoat and cure windows.

NDT. Radiography often needs an exclusion zone and sometimes night shift. The report still takes a day.

Transport of heavy parts. A 4 tonne frame is an oversize load in some jurisdictions, with permits and routing.

How to ask for a schedule that is useful

Instead of “what is your lead time”, ask for four things:

1. The breakdown by stage, as above.
2. Which stages are in house and which are subcontracted.
3. Whether the material is in stock or on order, and from where.
4. The two dates that matter: first article available, and full quantity delivered.

A shop that can produce that in a day is a shop that plans. A shop that gives you one number and nothing behind it may still deliver, but you have no early warning if it does not.

Design decisions that shorten the schedule

• Use a common grade and a common thickness. It moves material from four weeks to same week.
• Keep machined features on fewer faces. Fewer setups is less machine time and less queue.
• Apply tight weld quality levels only where needed. Rework is schedule.
• Decide the coating sequence early, especially if the part is galvanised, because that changes the whole order of operations.
• Choose a shop that welds and machines in house. Every handoff is a truck and a queue.

The single number problem

When you compare two quotes and one says eight weeks and the other twelve, the twelve week quote is often the honest one. It has counted the oven queue and the coating and the material.

Ask both for the breakdown. The comparison becomes real, and the shop that plans properly usually turns out to be the one that delivers on the date it gave you.

Send your RFQ with your required date and we will match it with shops that can actually hold it.

Frequently asked questions

Keep reading

• Farm Machinery Weldments: How Volume, Seasonality and Tolerance Choices Set the Price
• Why One Setup Is Cheaper Than Three on a Two Tonne Frame