How do I evaluate a metal fabrication job shop online before sending a quote request?
A fabrication job shop worth evaluating publishes the cutting processes it runs, the forming and bending capacity with tonnage and length, and the welding processes qualified to a named standard. Material thickness range and finishing in-house decide whether the quote is one supplier or three. ISO 9001 is the baseline quality expectation.
A buyer with a fabrication drawing is comparing job shops and discarding the ones whose capacity cannot be matched to the part.
Reviewed 4 August 2026
Scope and specifications
- Cutting processes
- Laser, plasma, waterjet, oxy-fuel and saw each suit different thicknesses, materials and edge quality.
- Forming and bending capacity
- Press brake tonnage and bed length tell a buyer whether their part can be formed in one hit.
- Welding processes and qualification standard
- MIG, TIG, ARC and spot welding with a procedure qualification record separate a coded shop from a garage.
- Material thickness range
- The hard filter on whether the part is feasible.
- Finishing and coating in-house
- Powder coating, galvanising, plating and painting change lead time and the supplier count.
- Maximum sheet or plate size handled
- Determines whether nesting and handling suit the bill of materials.
- Assembly capability
- Whether the shop delivers loose parts, sub-assemblies or a finished weldment.
Documents buyers may need
| Document | What it proves | Where it belongs |
|---|---|---|
| ISO 9001 certificateAsked at: vendor approval | Quality system, with number and certification body | Publish it |
| Welding procedure qualification record (WPQR)Asked at: technical evaluation and contract | That the welding procedure is qualified to a named standard for the materials and thicknesses joined | Name it, share on request |
| Welder qualification certificatesAsked at: critical and regulated work | That individual welders are coded to the procedure and position required | Name it, share on request |
| Material test certificate to EN 10204Asked at: with delivery, often a purchase order condition | Grade and mechanical properties of the plate or sheet used | Per shipment |
| Dimensional inspection reportAsked at: acceptance | Conformity to the fabrication drawing, including weld preparation and final dimensions | Per shipment |
| Paint or coating specification and thickness recordAsked at: where finish is specified | Coating system applied under a named standard with measured dry film thickness | Per shipment |
| Sample inspection reportAsked at: new supplier evaluation | What your dimensional paperwork looks like before the first order | Publish it |
Details for a useful enquiry
- Fabrication drawing or assembly model
- The basis of any quote, and the most useful thing on the form.
- Material grade and thickness
- Determines cutting process, forming tonnage and welding procedure.
- Quantity and call-off pattern
- Batch, scheduled and one-off volumes price very differently.
- Welding specification and inspection requirement
- Coded welds and non-destructive testing add cost and planning.
- Finish and coating requirement
- In-house or out-sourced changes lead time and price.
- Delivery location and required date
- Freight for large fabrications is a real constraint.
Questions suppliers ask
Should a fabrication shop publish its press brake capacity?
Yes, with tonnage and bed length per machine. Forming is the operation most often outside a shop's capability, and the tonnage-length pair lets a buyer work out whether their part can be formed in one hit. Omitting it produces enquiries no one can quote, and loses the ones you could.
How should welding capability be presented?
By process, with the qualification standard stated plainly. MIG, TIG, ARC and spot welding, plus the procedure standard and the positions qualified. "Fully equipped welding shop" tells a buyer nothing; a coded shop with WPQRs on file is a different category of supplier entirely.
Is it worth stating whether finishing is in-house?
Yes, because buyers plan their supplier count around it. A fabrication delivered coated by one supplier is a different commercial proposition from one delivered bare for someone else to coat. Hiding it is read as adding a margin and a delay, even when the truth is benign.
Check which documents and standards your buyer needs; requirements vary by market, customer and contract.
Plact Research. Plact's editorial desk for buyer-evidence research. Industry standards, documents and buyer questions are researched and drafted with Plact's AI tools, then reviewed by Praveen Kavuri before publication. Every claim cites the standard, regulation or public source it rests on.
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