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A welding brief should describe the joint and process before it names a robot. Include material, thickness, preparation and the required weld acceptance method. The torch, power source, fixtures and positioning equipment belong in the same discussion.
Application-specific questions
- Which joint types, materials and thickness ranges are in scope?
- Can the torch reach every seam at the proposed angle?
- How will fixtures control variation between parts?
- Which inspection method and sample joints define acceptance?
Prepare the supplier comparison
Supply part and fixture drawings, a weld schedule and representative samples. Request a process demonstration and a proposal that identifies the welding equipment and interfaces.
Define cell acceptance
Agree what will be demonstrated, how the cycle will be measured and which interfaces are included. Record the configuration used in the trial and the conditions that would require another review. Published robot specifications alone do not validate a complete application.
For system safety context, see the OSHA industrial robot system overview. Arrange an application assessment with a competent integrator; this procurement checklist is not a safety approval.
Buyer decision notes
Compare a welding process, not only a robot arm
A robot welding proposal must connect the joint specification to the fixture, torch path and inspection requirement. Begin with material and joint drawings, then document the variation in the incoming assembly. Buyers should distinguish the robot movement, welding process equipment and workholding responsibilities so that apparently similar bids can be compared on the same scope.
Prepared by RobotLineup Editorial · Analysis updated . Platform analysis, not an independent equipment test.
Compare proposals on the same basis
Ask each bidder to answer these items against the same drawings, parts and operating sequence. An unanswered item is a comparison gap, not a passed requirement.
| Decision | Evidence to request | Avoid this assumption |
|---|---|---|
| Joint and process | Material, thickness range, joint preparation, weld sequence and the buyer’s applicable acceptance method. | One attractive demonstration weld validates every joint. |
| Torch access | A path study including torch geometry, lead-in, termination and positioner movement if proposed. | Robot reach alone establishes welding access. |
| Fixture variation | Representative assemblies, locating method and a response to gaps or distortion. | Nominal CAD geometry is the only condition to test. |
| Complete equipment | An itemised list of power source, torch, feeding, extraction, guarding and interfaces within the quoted scope. | A robot-only quotation includes a complete process cell. |
Tie the proposal to inspectable welds
Require bidders to state how they will demonstrate the buyer’s specified joint quality. List which sample joints cover the proposed range and what inspection is included. The platform does not select a welding procedure or certify a weld; those decisions require the qualified people and requirements applicable to the project.
Separate arc-on or process time from loading, repositioning, cleaning and inspection. If a positioner or second station is proposed, compare its footprint, access and responsibilities with the initial brief. Any claimed production cycle should show its boundary and the sample configuration.
Worked sourcing brief
Illustrative procurement exercise. Assumptions below are invented for explanation; this is not a customer case, trial result or quotation.
Assume a bracket has two accessible seams and a third inside a corner. A demonstration on the straight external seam does not answer the corner access or the effect of the fixture. Ask for the complete seam sequence with the proposed torch and workholding, then inspect the samples using the agreed method. This example does not establish a welding procedure, production rate or quality result.
What to record before acceptance
Agree the test method, responsibilities and pass conditions before ordering. The items below are records to request, not a completed validation.
- Save joint drawings, material identification and the tested fixture and torch configuration.
- Keep inspection records for the agreed sample set and identify unresolved joint conditions.
- Record the complete cycle boundary, consumable assumptions and integration responsibilities.
Common buyer questions
Should a welding robot be selected before the torch and fixture?
Define them together. Tool geometry and workholding influence the approaches the arm must perform.
Is a video enough to accept a welding cell?
A video can show motion but cannot replace the agreed weld inspection and documented configuration.