Material and section specification
Cold-rolled and galvanised steel are the main materials presented for WELDON FAB enquiries, commonly with a powder-coated finish. Stainless-steel and aluminium parts can also be submitted for review.
The guides below show how to describe an enquiry. They do not state stock availability, tolerance limits or a guaranteed production range.
Section notation
Dimensions are in millimetres unless the drawing states otherwise. L is the required cut length; state stock length separately when it affects supply. Tube corner radius, seam position and dimensional tolerances must be specified where they affect fit or appearance.
Sheet / plate
t thickness · W width · L sheet length
Dimension-writing example only
Grade: specify separately · t1.5 × W300 × L500 mm
Not a stocked size or production-capability promise.
Round tube
OD outside diameter · t wall thickness · L cut length
Dimension-writing example only
Grade: specify separately · OD30 × wall 2 × cut length 600 mm
Not a stocked size or production-capability promise.
Square tube
B outside side length · t wall thickness · L cut length
Dimension-writing example only
Grade: specify separately · 30 × 30 × wall 2 × length 600 mm
Not a stocked size or production-capability promise.
Rectangular tube
B outside width · H outside height · t wall thickness · L cut length
Dimension-writing example only
Grade: specify separately · 40 × 20 × wall 2 × length 600 mm
Not a stocked size or production-capability promise.
Material families
Material selection affects forming, joining, finish and inspection. A general label such as mild steel, stainless or aluminium is not enough when a specific grade or condition controls the job.
Common enquiry route
A main enquiry material for formed and powder-coated sheet-metal parts. State the grade or standard, thickness, cosmetic face, bend and weld requirements.
Exact grades, thickness range, stock and tolerance coverage are confirmed for the submitted job.
Common enquiry route
State the substrate grade, thickness and coating designation where known. Cut edges, bends, weld areas and any final finish must be reviewed together.
Corrosion-life or coating-performance requirements need an agreed specification and process record.
Reviewed per enquiry
State the grade, thickness or tube wall, surface finish, weld appearance and any contamination-control requirement.
Grade, finish and contamination-control requirements are checked before quotation.
Reviewed per enquiry
State the alloy, temper, thickness or section size, joining method, cosmetic face and required finish.
Forming, joining and finish compatibility depend on the actual alloy and temper.
Process and finish inputs
A note such as powder coat black is incomplete when pretreatment, masking, appearance or interfaces affect acceptance.
Buyer provides
Drawing or DXF, material, thickness, edge requirement and quantity
Checked before commitment
Geometry, material route and edge or feature constraints
Buyer provides
Bend lines, direction, critical inside radius and datum scheme
Checked before commitment
Sequence, access and tolerance risk
Buyer provides
Joint definition, visible faces, mating parts and inspection note
Checked before commitment
Access, sequence, distortion and appearance requirement
Buyer provides
Colour reference, gloss or texture, pretreatment, masking and performance requirement
Checked before commitment
Substrate compatibility, cosmetic faces and inspection method
Buyer provides
BOM, bought-in parts, fastener and interface drawings
Checked before commitment
Fit, sequence, traceability and agreed inspection points
Common drawing contexts
These are general specification contexts, not named customer cases or proof that every material, section size or process has been completed by WELDON FAB.
General examples
Enclosure panels, guards, covers, doors and dividers
Drawing details
Interface holes, bend datums, door gaps, hinges, locks and cosmetic faces
General examples
Mailbox or parcel compartments, lockers and display structures
Drawing details
Compartment layout, door swing, lock interface, anchoring and assembly sequence
General examples
Equipment or display frames and supports
Drawing details
Section orientation, cut length, joint detail, squareness and mounting interfaces
General examples
Panels or covers attached to a frame
Drawing details
BOM, weld or fastener method, panel gaps, service access and finish compatibility
Quote-input checklist
If a field is undecided, mark it for manufacturability review instead of guessing. A placeholder should not look like an approved specification.
