CUSTOM WELDMENTS · SHEET METAL ASSEMBLIES
Welding Services
for Custom Assemblies
Bring separate metal parts together into a drawing-defined assembly. Review joints, materials, distortion control and finished interfaces with ProleanTech before production.
Start with your assembly drawing, BOM and weld requirements.
SOURCE THE COMPLETE ASSEMBLY
Start with what
the joint needs to do.
Welding permanently joins metal parts at selected interfaces. For custom weldments, the useful specification extends beyond the seam: mounting geometry, loads, finish and assembly fit all shape the manufacturing route.
One BOM. A defined scope of supply.
Identify fabricated parts, purchased hardware, welded subassemblies and any customer-supplied items. Agree which operations and inspection documents the quotation includes.
Choose the welding route
around the joint.
Share a required process or ask for a route proposal. ProleanTech confirms the available process and its suitability for your material, thickness, weld access and production quantity in the quotation.
Send weld symbols, seam locations and any restrictions on filler, grinding or visible welds with the drawing.
TIG / GTAW
A non-consumable tungsten electrode creates the arc, with filler added separately when needed. Evaluate TIG where weld-pool control, joint access and appearance matter. Fit-up, shielding and surface preparation remain essential.
MIG / MAG · GMAW
A continuously fed wire acts as electrode and filler. Evaluate the route for fabricated metal assemblies and repeated seams. Wire, shielding gas, transfer mode and parameters must suit the alloy, thickness and welding position.
Other specified processes
If the drawing calls for resistance spot, laser or another welding process, include it in the RFQ for a separate capability review. Electrode or beam access, joint design, tooling and order volume affect feasibility.
Specify the alloy.
Define the connection.
“Steel” or “aluminum” alone is not a welding specification. State the exact grade, condition, thickness and mating material so weldability, filler selection and post-weld requirements can be assessed.
| Material family | What to review | Include with your inquiry |
|---|---|---|
| Carbon & low-alloy steel | Composition, hardenability, restraint, coating condition and any preheat or post-weld treatment requirements. | Exact grade, thickness, load conditions, required weld properties and finish. |
| Stainless steel | Grade compatibility, heat input, distortion, shielding access, heat tint and required corrosion performance. | Grade, service environment, internal surface requirements and cleaning or passivation specification. |
| Aluminum alloys | Alloy and temper, oxide removal, filler compatibility and changes in the heat-affected zone. Not all grades weld equally well. | Exact alloy and temper, thickness, final strength requirements and intended finish. |
| Dissimilar & special alloys | Metallurgical compatibility, dilution, cracking risk and alternative joining routes. | Both material specifications and service conditions for a separate feasibility review. |
Edge-to-edge alignment
Define edge preparation, root gap, penetration and access to each side. Fit-up and alignment affect both the joint and final assembly dimensions.
Overlap & seam location
Define overlap, weld length and whether sealing is required. Consider crevices, trapped process fluids and the finished coating route.
Weld size & tool access
Specify the fillet size, length and side of the joint. Check torch access, nearby features and the mounting surfaces that must remain clear.
DFM · FIXTURES · WELD SEQUENCE
Control the assembly,
not just the weld bead.
Heating and cooling cause local expansion and shrinkage. A practical plan combines joint design, fit-up, fixtures and welding sequence, then checks the assembly after restraint is released.
Set final functional datums
Identify mounting faces, mating holes, angles and flatness that matter to assembly. Separate part tolerances from weldment tolerances, and state whether dimensions apply after machining or coating.
Plan fit-up & fixturing
Review locating features, tack locations and clamp access. Fixtures help hold alignment, but restraint can also introduce residual stress. Plan how the part will be released and measured.
Manage heat & shrinkage
Review weld volume, placement and sequence. Balanced welding, suitable sequencing and controlled heat input can help limit distortion. Use the required weld size; more weld metal can increase shrinkage.
Validate before repeat production
For new or revised assemblies, agree sample approval, critical measurements and any fit checks. Capture the approved drawing revision and manufacturing requirements for repeat orders.
Plan the operations
after welding.
Finished dimensions and surface condition depend on the processing sequence. Include secondary operations in the original RFQ so the quotation covers the assembly you intend to install.
Post-weld machining
Review machining for critical mounting faces, bores or hole patterns after welding. Provide datums, machining allowance and tool access. Any stress-relief requirement must be evaluated for the alloy and application.
Cleaning & weld dressing
Specify spatter removal, deburring, heat-tint removal and permitted weld blending. Grinding flush can reduce the weld section; define the required profile and structural acceptance together.
Coating & corrosion control
Review powder coating, painting or appropriate chemical treatment for the material. Specify masking, final dimensions, drainage and visible faces. Aluminum welds can show color differences after anodizing.
AGREE THE INSPECTION PLAN
Check what your
assembly needs to prove.
Weld appearance alone does not establish joint strength, fatigue life or leak tightness. Define acceptance against the drawing, application and any governing specification before order placement.
Dimensional inspection
Identify final datums and critical dimensions. Agree checks for mounting position, flatness, angles and overall fit, including the condition in which the assembly is measured.
Weld & surface examination
Define visual acceptance for seam location, weld profile and surface condition. Specify any additional examination method, extent and acceptance criteria in the RFQ.
Documentation & tests
Request material records, dimensional reports, qualification documents or functional tests as needed. WPS/PQR, welder qualifications, NDT and leak testing require explicit scope and availability confirmation.
For code-governed or safety-critical work, provide the applicable code, edition and required records for review before the manufacturing route is agreed.
Welding service FAQ
Define the part, the joint and the acceptance plan before comparing quotations.
What does your custom welding service cover?
ProleanTech reviews drawing-defined metal components and sheet metal assemblies for welding, related fabrication, finishing and inspection. Supply the assembly drawing and BOM so the quotation can define the manufacturing route, included operations and acceptance requirements.
Which welding process should I specify?
TIG and MIG/MAG are common routes to evaluate. TIG offers control over the weld pool and filler addition; MIG/MAG uses a continuously fed consumable wire. Selection depends on alloy, thickness, joint access, appearance and production quantity. State a mandatory process on the drawing; otherwise request a proposed route with your quote. Process availability is confirmed for the project.
Can you weld aluminum, carbon steel and stainless steel?
Include these materials in your inquiry with the exact alloy, condition, thickness and mating material. Weldability varies within each material family. Aluminum temper and heat-affected-zone behavior, stainless surface condition and carbon-steel composition require different reviews. Dissimilar metals and other alloys need a separate feasibility assessment.
What tolerance can I expect on a welded assembly?
Weld shrinkage and restraint affect final geometry. Identify critical datums, flatness, angles, mounting faces and hole positions on the finished assembly. State whether measurements apply after welding, machining or coating. Agreed drawing requirements and the accepted quotation define tolerances; there is no single tolerance for every weldment.
Will welding change the material around the joint?
Fusion welding creates a heat-affected zone and can change local properties as well as cause distortion and residual stress. Material and filler selection, joint design, heat input, fixtures and weld sequence help manage these effects. Joint performance must be assessed for the design and its service conditions.
Can you provide WPS, PQR, qualified welders or NDT?
Include the governing code, required qualifications, documentation and examination scope in the RFQ. Availability and applicability must be confirmed before order acceptance. Specify the NDT method, extent, acceptance criteria and reporting needs; these are not automatically included in every order.
Can the assembly be machined or coated after welding?
Include machining, grinding, cleaning and finishing in the same RFQ. Identify final datums and masked areas. Machining may be appropriate for critical interfaces after welding. Coating and cleaning compatibility depend on the alloy, filler, joint geometry and service environment; grinding a weld flush must be agreed against the required joint strength.
What should I send for a welding quotation?
Send the assembly drawing, individual part drawings or CAD, BOM, units and revision. Specify material grades, thicknesses, weld symbols or seam locations, quantity breaks, final dimensions, finish and inspection documents. Include the delivery destination and required date, plus any governing code, qualification, load or leak-test requirements.
YOUR NEXT ASSEMBLY
Send the drawing.
Define the complete weldment.
Bring your BOM, material specifications and finished-part requirements. We’ll review the proposed route and define the scope in your quotation.
Need an agreement before sharing drawings? View NDA options ↗