Resistance Welding Machine Qualification and Weld Schedule Control

Resistance Welding

Resistance Welding Machine Qualification and Weld Schedule Control

Resistance welding in aerospace manufacturing requires precise control of machine parameters, validated weld schedules, and full traceability between equipment, operators, and production parts. Proper qualification and control are essential to ensure repeatability, structural integrity, and compliance with aerospace standards. This case study highlights how Amer Welding Solutions supported an aerospace manufacturer in strengthening machine qualification, weld schedule validation, and overall process control for resistance welding operations.

The Challenge

The customer was performing resistance spot and seam welding on aerospace components and was preparing for compliance with customer and NADCAP requirements. Key challenges included:

Incomplete or inconsistent machine qualification records
Weld schedules not fully validated or standardized
Limited traceability between weld schedules, machines, and production parts
Inconsistent documentation across engineering and production
Lack of a structured approach aligned with AWS D17.2 requirements

While welding operations were functional, the process lacked the level of control and documentation required for aerospace compliance and repeatability.

Results

Improved machine qualification structure and documentation

Standardized and validated weld schedules

Increased process consistency and repeatability

Enhanced traceability across welding operations

Improved alignment with aerospace and NADCAP expectations

Technical Assessment

Amer Welding Solutions conducted a detailed assessment of the resistance welding process, focusing on machine capability, parameter control, and documentation structure. The assessment included:

Review of machine qualification records and calibration status
Evaluation of weld schedule parameters including: Current, Weld time, Electrode force, Squeeze and hold time
Verification of weld schedule validation methods
Review of destructive testing methods, including: Peel testing, Tensile/shear testing, Metallographic evaluation
Assessment of traceability between: Machine identification, Weld schedule numbers, Operators, Production parts
Review of documentation practices and revision control

The key finding was that while the process produced acceptable welds, it lacked a structured and traceable system for qualification and control.

Business Impact

Increased confidence in resistance welding process capability
Improved readiness for customer audits and NADCAP assessments
Reduced risk of process variability and nonconformance
Stronger integration between engineering, production, and quality
Enhanced overall process control and documentation discipline

This project strengthened both the technical integrity of the welding process and the organizational structure supporting it.

Solution Implemented

Amer Welding Solutions implemented a structured and practical framework to improve machine qualification and weld schedule control. Key actions included:

Developing a machine qualification program aligned with AWS D17.2
Establishing clear requirements for: Initial qualification, Requalification intervals, Post-maintenance validation
Standardizing weld schedule documentation, including: Defined parameter ranges, Unique schedule identification
Implementing traceability between: Machine, Weld schedule, Operator, Production job
Supporting validation through: Destructive testing, Metallographic evaluation where required
Improving documentation structure for consistency and clarity
Aligning engineering, production, and quality teams on process requirements

The solution focused on making the process both technically sound and easy to maintain on the shop floor.

Why It Matters

Resistance welding in aerospace applications requires strict control due to:

Without proper qualification and schedule validation, even small variations can lead to inconsistent results. By implementing structured machine qualification and weld schedule control, manufacturers can ensure consistent weld quality and reliable performance.