| Welding processes | Confirm which processes are used for the part, such as GMAW (MIG/MAG), GTAW (TIG), FCAW, or SMAW, and whether the process suits the material, joint, thickness, and production volume. | Process list, sample weld procedures, production route, and examples of comparable work. | Can explain why a process is appropriate and how process choice affects access, distortion, productivity, and inspection. |
| Welding procedure control | Check whether welding is performed to documented instructions and whether procedure qualification is required by the contract, code, or application. | Welding Procedure Specification (WPS) and, where applicable, supporting Procedure Qualification Record (PQR) or equivalent qualification documentation. | Documents identify relevant materials, joint details, welding positions, consumables, and essential variables in a way that matches the work. |
| Welder qualifications | Verify that personnel are qualified for the processes, positions, materials, and range of work required. | Current qualification records and a method for tracking qualification scope and continuity, where required. | Can match the assigned welder’s qualification to the applicable job requirements. Standards such as ISO 9606-1 may apply to fusion welding of steels, depending on the project and jurisdiction. |
| Equipment and maintenance | Review the suitability and condition of power sources, wire feeders, torches, fixtures, positioners, and extraction equipment. | Equipment list, preventive-maintenance records, and examples of checks performed before production. | Equipment capacity suits the specified process and part; faults and maintenance are recorded and addressed. |
| Measurement and calibration | Check how the supplier verifies welding parameters and the measuring tools used for part inspection. | Calibration or verification records for relevant instruments, such as gauges, measuring devices, and monitoring equipment. | Records identify the instrument, status, and due date; out-of-tolerance findings have a documented response. |
| Material identification | Confirm how base materials and welding consumables are received, stored, identified, and linked to production lots. | Material certificates where specified, incoming inspection records, consumable storage controls, and traceability examples. | Can preserve the level of material and weld traceability required by the drawing, purchase order, or governing code. |
| Joint preparation and fit-up | Review controls for edge preparation, cleanliness, root gap, alignment, tack welds, and fixturing. | Work instructions, fit-up inspection records, fixtures or gauges, and samples of in-process documentation. | Checks critical joint conditions before welding and controls fit-up consistently across repeat parts. |
| Inspection and testing | Agree on visual inspection and any required non-destructive testing (NDT), acceptance criteria, and inspection stages. | Inspection and test plan, sample reports, NDT method details, and personnel qualifications where required. | Inspection scope and acceptance criteria are defined before production; methods such as liquid penetrant, magnetic-particle, ultrasonic, or radiographic testing are selected as appropriate to the part and specification. |
| Distortion and dimensional control | Ask how the supplier manages weld shrinkage, distortion, sequence, and final dimensions. | Weld sequence or fixture plans, dimensional inspection records, and examples of corrective actions. | Plans inspection around critical dimensions and can describe how sequence, restraint, or process adjustments are used to meet drawing tolerances. |
| Quality system and records | Determine whether the supplier’s quality controls fit the complexity and risk of the work, and whether any specified quality standard is met. | Quality-system scope, sample nonconformance and corrective-action records, and relevant certification documents when contractually required. | Maintains controlled documents and production records. ISO 3834 may be relevant when comprehensive quality requirements for fusion welding are specified. |
| Technical expertise | Discuss drawing interpretation, weld symbols, material compatibility, tolerances, and manufacturability before placing an order. | Technical review notes, clarification questions, design-for-manufacture feedback, and examples of similar part types. | Raises practical questions early and distinguishes mandatory drawing or code requirements from recommendations. |
| Production capacity and consistency | Check whether staffing, work cells, fixtures, and inspection capacity can support the required batch size and delivery schedule. | Capacity plan, production schedule assumptions, sample batch records, and process-control checks. | Provides a credible plan for prototypes and repeat production, including how changes and rework are managed. |
| Supplier audit and sample run | Validate claims through a site or remote process review and, for suitable projects, a first-article or pilot batch. | Audit checklist, sample-part inspection results, approved first-article records, and corrective-action follow-up. | Allows reasonable verification, documents findings, and resolves agreed issues before full-rate production. |