Machined Weldment Guides for Buyers
Written for engineers and buyers who have a welded and machined part to place and want to know what to ask before the first quote lands.
Machined weldments
What they are, when they beat a casting, how to specify one.
Start hereWeldment cost
The eight lines that decide the price, and which you control.
Start hereWeldment tolerances
Allowance, datums and two tolerance systems on one drawing.
Start hereChoosing a supplier
The numbers and questions that rule shops in or out.
- Process
Oct 18, 2026Lamellar Tearing and Z-Grade Plate in Weldments
Lamellar tearing in thick plate T and corner joints: cause, Z15 Z25 Z35 through-thickness grades to EN 10164, design fixes and what to specify on the drawing.
- Tolerances
Oct 17, 2026Hydraulic Press Frames as Machined Weldments
Press frame weldment guide: C-frame and four-post designs, deflection targets, thick plate welding, stress relief, machined faces and cylinder bores, and RFQ content.
- Process
Oct 16, 2026Horizontal Boring Mill Machining for Large Weldments
How horizontal boring mills machine large weldments: table and floor types, spindle reach, rotary table indexing, setup count and what to ask a shop at quote stage.
- Process
Oct 15, 2026Weldments for Packaging and Food Machinery
Food machinery weldments in stainless steel: hygienic design, continuous welds, radii, surface finish, pickling, passivation, machined interfaces and what to put in the RFQ.
- Process
Oct 14, 2026Choosing Filler Metal for a Machined Weldment
Filler metal selection for machined weldments: strength matching, classification codes, low hydrogen control, effect of stress relief and how weld metal machines.
- Comparisons
Oct 13, 2026Fabricated Gearbox Housings: Weldment or Casting
Fabricated gearbox housing versus casting: stiffness, damping, tooling cost, batch size, bore alignment, oil tightness, cleanliness and the machining plan for a welded housing.
- Process
Oct 12, 2026Duplex Stainless Weldments and Ferrite Control
Duplex stainless welding for machined weldments: the ferrite and austenite balance, heat input and interpass limits, filler choice, no stress relief and what to specify.
- Process
Oct 11, 2026Low Temperature Steels for Weldments: Charpy Grades
Charpy impact steel for low temperature weldments: how the V-notch test works, S355 J2 and K2 versus N and NL grades, weld and HAZ testing and what to put on the drawing.
- Comparisons
Oct 10, 2026Cast Steel Nodes Inside Fabricated Weldments
Cast steel weldment hybrid design: where cast nodes replace complex welded joints, weldable casting grades, tooling cost, NDT, machining stock and when fabrication stays cheaper.
- Cost
Oct 5, 2026Agricultural Machinery Weldments: Volume and Cost
Agricultural weldments explained: typical parts, material and plate thickness, jigs and volume tiers, machining tolerances, coating and how annual forecasts lower unit cost.
- For Fabricators
Sep 26, 2026How Fabrication Shops Should Price Weldment Work
A structured way for fabrication shops to price weldment work: separating weld hours from machine hours, costing setups honestly and pricing the risk you are actually carrying.
- Comparisons
Sep 26, 2026In House or Outsourced Weldment Fabrication
Capacity, capital, skills and risk compared for in house versus outsourced weldment fabrication, and the hybrid most manufacturers settle on.
- For Fabricators
Sep 26, 2026Selling Idle Boring Mill and Machining Capacity
What fabrication shops with large machining capacity should publish, who to target and how to price fill-in work without damaging the rates on your core customers.
- Comparisons
Sep 26, 2026Welded or Bolted: Choosing Between Them
Stiffness, cost, shipping, repairability and tolerance stack-up compared for welded and bolted structures, plus the hybrid that most large machines actually use.
- For Fabricators
Sep 26, 2026What Weldment Buyers Check Before They Order
The questions serious weldment buyers ask, in the order they ask them, and what a fabrication shop should have ready before the enquiry arrives.
- For Fabricators
Sep 26, 2026When a Fabrication Shop Should Decline an RFQ
Estimating costs money and a badly won job costs more. The six signals that a weldment enquiry should be declined, and how to decline it without losing the customer.
- For Fabricators
Sep 26, 2026Why Fabrication Shops Lose Weldment RFQs
Why fabrication shops lose weldment work they could have made: slow response, unexplained pricing, wrong capability signals, no questions asked and quoting the wrong risk.
- Comparisons
Sep 26, 2026Why Weldments Cannot Be Instant Quoted
Instant quote platforms price CNC and sheet metal well and struggle with weldments. What a model cannot tell a pricing engine, and what that means for your RFQ.
- Process
Sep 21, 2026Aluminium Weldments and the Heat Affected Zone
What welding does to the strength of 6061-T6 and 5083 aluminium, how wide the heat affected zone is, and how to design and machine an aluminium weldment around it.
- Process
Sep 21, 2026Blanchard Grinding or Milling a Weldment Face
Blanchard grinding versus milling on large weldment faces: flatness, surface finish, scale and mill scale removal, part size limits and what each route costs.
- Tolerances
Sep 21, 2026GD&T on Welded and Machined Parts
How to apply datums, flatness, position and parallelism to a machined weldment, why welded and machined features need separate tolerance systems and where ISO 13920 fits.
- Choosing a Supplier
Sep 21, 2026How to Vet a Machined Weldment Supplier
A practical assessment for machined weldment suppliers: machine travels, crane capacity, stress relief, inspection, qualifications and the questions that reveal real capability.
- Tolerances
Sep 21, 2026ISO 5817 Weld Quality Levels B, C and D
What ISO 5817 quality levels B, C and D actually accept, how the level changes welding cost and rework, and how to apply different levels to different joints.
- Cost
Sep 21, 2026Machining Setups on a Large Weldment
How machine envelope, crane capacity and the number of setups drive the machining cost and the tolerance risk on a large weldment, and how to design for fewer setups.
- Cost
Sep 21, 2026What Drives the Cost of a Machined Weldment
The eight lines that decide what a machined weldment costs: plate grade, weld length, quality level, inspection, stress relief, setups, geometric tolerance and freight.
- Tolerances
Sep 21, 2026Machining Allowance and Tolerances on Weldments
How much machining allowance to leave on a welded frame, how to split weldment and machining tolerances on the drawing and where to put the datums.
- Process
Sep 21, 2026Non-Destructive Testing on Weldments
Visual, dye penetrant, magnetic particle, ultrasonic and radiographic testing on weldments: what each method finds, what it misses and what it adds to the quote.
- Cost
Sep 21, 2026Painting and Galvanising a Machined Weldment
Masking, coating sequence and the distortion risk of hot dip galvanising on machined weldments, plus what to specify so machined faces arrive usable.
- Process
Sep 21, 2026Stainless Steel Weldments and Post-Weld Finishing
Distortion, sensitisation, back purging, pickling and passivation on 304L and 316L weldments, and what each adds to the cost of a stainless fabricated frame.
- Process
Sep 21, 2026Stress Relief Before Machining a Weldment
Thermal and vibratory stress relief for weldments: when residual stress will move your machined faces, what a PWHT cycle involves and where it belongs in the sequence.
- Process
Sep 21, 2026How Fabricators Control Weld Distortion
The six causes of weld distortion in large weldments and the controls fabricators use: joint design, weld sequence, heat input, fixturing, prebending and balanced welding.
- Tolerances
Sep 21, 2026Weld Symbols on a Weldment Drawing
The parts of an AWS A2.4 weld symbol, what the arrow side and other side mean, and the five things buyers most often leave off a weldment drawing.
- Choosing a Supplier
Sep 21, 2026Welding Codes a Weldment Buyer Should Know
What AWS D1.1, ISO 3834 and EN 1090 each cover, which one applies to your part and market, and what to ask a supplier to show you for each.
- Process
Sep 21, 2026Weldment Fixturing and Fit-Up
Why fit-up and fixturing set the outcome of a large weldment, what modular and dedicated fixtures cost, and what a buyer should say about tacking and root gaps.
- Cost
Sep 21, 2026Weldment Lead Time and Where the Weeks Go
A realistic breakdown of machined weldment lead time: material, cutting, fit-up, welding, stress relief queues, machining, inspection and coating, and how to compress it.
- Cost
Sep 21, 2026Choosing the Steel for a Machined Weldment
How structural steel grade changes welding, preheat, distortion and machining on a weldment, and when the higher strength plate is worth paying for.
- Choosing a Supplier
Sep 21, 2026Weldment, Casting or Machined From Solid
How size, quantity, tooling cost and lead time decide whether a structural part should be welded, cast or machined from solid, and where the break-even usually sits.
- Choosing a Supplier
Sep 21, 2026WPS, PQR and Welder Qualification Explained
The difference between a WPS, a PQR and a welder qualification record, what a qualification range covers and the three questions to ask a weldment supplier.