Color as a Quality Indicator
Silver-White: Ideal, indicating minimal oxidation Light Gold: Acceptable, slight oxidation Dark Blue/Purple: Unacceptable, requires evaluation Gray/White Powder: Critical failure, must be reworked
Why Lag Discoloration Occurs
Premature Gas Cut-off: Stopping argon too early after welding Extended High-Temperature Exposure: HAZ remains above 400°C post-weld
Consequences of Weld Discoloration
Hydrogen Cracking: Delayed fracture under stress Loss of Corrosion Resistance: Degraded performance in critical applications
Prevention Strategies
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