Definition
A weld is missing when there is no fusion of parent metal or coatings
at the intended weld location.
Description
Missing welds can occur either because:
- The welding equipment never contacted the workpiece at the intended
weld location.
- Inadequate heat was developed at the intended location.
Detection
Reference should be made to the appropriate manufacturer's specifications
to determine required locations for spot welds. Workpiece inspection
may then determine whether visible welds are properly located or missing.
Where welds are not visible (e.g., no indention or heat discoloration
due to Class-A surface requirements), nondestructive or destructive
test methods are required.
Significance
Quality, Workplace Issues, Cost, Downtime, Maintenance, Throughput (cycle
time; PPH) are all potentially affected by this condition.
Possible Causes
Strong Possibilities
Weak Possibilities
Nonmatrix Possibilities
- Inadequate training
- Improper revision level documentation on plant floor.
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