Approved assembly definition
Drawing, model, sample and revision status
Heavy equipment fabrication
Welded Assemblies Start With the Interfaces
ROCKVANTA reviews steel fabrications and custom welded assemblies from current drawings, samples or project specifications. A useful quotation covers the material, joint requirements, datums, functional interfaces, post-weld work, inspection records and delivery scope.
Materials and sections
Grade, thickness, profiles and supplied condition
Interfaces and datums
Mating faces, hole patterns, pads and locating features
Welding and acceptance
Joint requirements, inspection and required records
Project scope
Quantity, finish, packing, destination and timing inputs
What the drawing defines
Different Assemblies Need Different Controls
The assembly shape and required interfaces determine the fabrication plan. ROCKVANTA reviews the drawing, material, joints, access, restraint and inspection requirements for the quoted assembly.
Heavy fabrication
Heavy equipment frames and bases
For drawing-defined frames, bases, brackets and load-carrying fabrications. Send the joint details, interface dimensions, load or service notes, machining allowances and any required hold points.
Formed assemblies
Formed and sheet-metal assemblies
For cut, blanked, drilled, bent and assembled parts where bend references, hole-to-bend relationships, edge conditions, surface requirements and assembly sequence affect fit.
Project structures
Structural supports and project fabrications
For frames, supports and brackets tied to an equipment or site interface. Define mounting points, loads, access, finish, documentation and the parts supplied by others.
Cutting, Forming and Welding Equipment
Send the assembly drawing, materials, weld details and inspection requirements. We review cutting, forming, joining and handling together so the quotation covers the complete fabricated assembly.
Preparation and forming
- Cutting
- Plate and tube laser cutting, plasma cutting and CNC sawing
- Forming
- Press brakes, plate rolls and bar-bending equipment
- Press-capacity reference
- 220 tonnes
- Secondary operations
- Milling, drilling, tapping and post-weld machining
Assembly and welding
- Structure-height reference
- 4 m
- Handling-capacity reference
- 20 tonnes
- Welding equipment
- Panasonic, Aotai and OTC welding sets; laser welding and a welding manipulator
- Certified welding scope
- ISO 3834 Part 2 certificates list construction machinery components, MAG (135) and material group 1.2
- Inspection equipment
- Ultrasonic and fluorescent magnetic-particle inspection equipment
The assembly plan confirms the applicable material, joint, welding procedure, workpiece weight and lifting arrangement.
View welding certificates
Before production planning
Define What the Assembly Must Locate and Support
Overall dimensions alone do not control a welded assembly. Functional datums, mating faces, hole patterns, machined pads, joint access and the sequence of downstream operations determine how the work should be held and checked.
Functional interfaces
Identify the faces, bores, pads, brackets and hole patterns that locate or connect the assembly.
Material and joint definition
State the grades, thicknesses, profiles, joint details and any customer-specified welding requirements.
Restraint and sequence
Flag the relationships that need a fixture, temporary bracing, intermediate checks or a planned welding sequence.
Downstream operations
Identify machining, heat treatment, surface finishing, assembly, identification and packing that must be included with the fabrication scope.
Welding method, qualification records, achievable tolerance and inspection method are confirmed against the specific project definition and proposed production plan.
From blank to finished assembly
Coordinate Cutting, Forming, Welding and Machining
The production plan must protect critical interfaces from material preparation through final release. Individual operations are included only where the drawing and quoted scope require them.
Cutting and preparation
Plate, sections and blanks are prepared against the approved definition. Edge condition, stock allowance, hole preparation, identification and the next operation should be clear before release.
Forming and fit-up
Bend references, formed geometry, fit-up gaps, datum stops and temporary restraints are reviewed before welding. The setup must leave access for the required joints and later inspection.
Welding and fabrication
Joint sequence, access, restraint and intermediate checks are planned around the assembly. The quotation records the required instructions and documents for the project.
Post-weld machining
Machined pads, bores, shafts or other interfaces may be completed after fabrication where the drawing requires them. Machining allowance, datum transfer and final inspection remain tied to the assembly definition.
Before the final weld
Confirm Datums, Restraint and Weld Sequence Before Final Welding
Heat and restraint can move a welded assembly. The review therefore looks at where the frame is located, how it is clamped, which relationships need intermediate checks and whether machining or correction is planned after welding.
- Identify the functional datums used to locate the assembly.
- Support the assembly without hiding required joint access.
- Plan restraint and weld sequence around distortion risk.
- Check critical diagonals, pads and interfaces before the assembly leaves the fixture.
Process review may identify open manufacturing points. It does not change the customer-approved drawing or specification without authorization.
Acceptance follows the quoted scope
Inspect the Functional Dimensions and Interfaces
Inspection should cover the features that affect installation, mating equipment and service. Depending on the drawing and quoted work, the plan may include dimensional inspection, visual weld checks, hardness testing, NDT or requested in-process and final records where applicable.
Dimensions and interfaces
Agree the datum relationships, mating features and recorded results required for release.
Material and process records
Identify certificates, welding records, treatment records or surface records required for the order.
In-process hold points
Decide what must be checked before a joint is closed, a restraint is removed or the assembly moves to another operation.
Final release
Connect inspection records, identification, assembly status and packing to the quoted deliverable.
Third-party inspection
If required, the buyer may arrange an inspector, nominate an inspection body or ask ROCKVANTA to coordinate with a suitable provider. Timing, scope and cost must be agreed before the order or shipment. Inspection, reinspection and report fees are buyer-paid.
company-owned manufacturing bases
Assign Fabrication and Supporting Processes to the Relevant Base
ROCKVANTA owns and operates five specialized manufacturing bases. Our team reviews the drawing, material, fabrication, inspection and project requirements, assigns the relevant base and coordinates any supporting work.
Equipment, qualifications, production scope, available capacity and timing are confirmed for the specific RFQ.
How We Select a Manufacturing BaseReview the approved assembly definition.
Assign the relevant fabrication base and supporting processes.
Coordinate inspection, documentation and downstream operations.
Confirm assembly, protection and export packing requirements.
Send the Assembly Details Needed to Plan Fabrication
Send the assembly interfaces, loads, service conditions and current drawing or model. List any unconfirmed field as an open point for technical review.
- Drawing, 3D model, revision and any reference sample
- Material grades, thicknesses, sections and supplied condition
- Joint details, welding requirements and requested records
- Functional datums, mating interfaces, loads and service notes
- Machining, treatment, finishing, inspection and assembly scope
- Quantity, project stage, destination and packing requirements