WELDING-FUNDAMENTALS4 MIN READ
Sort weld defects by likely cause
Classify visible weld symptoms into likely cause families for first-pass diagnosis.
Sort each visible clue into the first cause family you would investigate. Shielding or contamination Heat or parameter control Technique or bead placement Preparation or interpass cleaning Pinholes scattered through the bead face Porosity appears only when bay door is open Groove washed along the upper toe Thin sheet opens up under the puddle Dark line trapped between two passes Porosity starts where paint was left near the joint Bead sits on sidewall without wetting in Small crater at the stop that was not filled
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