Design out weld problems before the arc starts.

Sharp linear indications in the weld, crater, heat-affected zone, or base metal; some delayed cracks are not immediately visible.

High restraint, hydrogen, crack-sensitive alloy/filler combinations, rapid thermal cycles, poor crater termination, or an unqualified procedure.

Stop and route the condition through qualified review. Correct the cause before approved removal, repair, and re-examination.

Pinholes at the bead surface or rounded voids revealed by sectioning or volumetric examination.

Contamination, moisture, drafts, inadequate or turbulent shielding, leaks, excessive stickout, dirty filler, or poor aluminum oxide removal.

Protect and verify shielding, clean the joint and consumables correctly, check gas delivery, and follow the WPS.

Weld metal does not fuse completely to the base metal, sidewall, or preceding bead.

Insufficient energy at the interface, poor torch angle, excessive travel speed, oxide/scale, oversized root face, or inaccessible joint geometry.

Provide torch access and a qualified groove/root detail; remove contamination and verify parameters through the approved procedure.

The weld does not extend through the intended root or joint thickness.

Root opening, land, bevel, alignment, access, or heat input does not match the qualified joint design.

Call out the qualified joint geometry, manage cut tolerances, and provide access for backing, back-gouging, or two-sided welding when required.

Nonmetallic material becomes trapped between the weld metal and base metal or between passes.

Incomplete interpass cleaning, poor bead placement, narrow groove access, oxide-bearing edges, or process technique.

Prepare and clean to the WPS, give the welder usable groove access, and verify removal between passes.

A groove melted into the base metal beside the weld toe that is not filled with weld metal.

Excess heat, travel speed, arc length, poor angle, bead placement, or difficult access.

Avoid hidden or obstructed toes and tight inside corners that prevent controlled torch position and inspection.

Weld metal rolls onto the base metal without fusing at the toe.

Excess deposition, low travel speed, poor angle, low energy at the toe, or gravity acting on an unfavorable position.

Restore proper technique and WPS parameters; design joints that permit a stable torch angle and practical weld position.

A hole or excessive root opening where the weld pool collapses through the joint.

Excess heat, slow travel, inconsistent fit-up, oversized gap, thin edges, or poor backing.

Control the laser-cut gap and edge condition, support repeatable fixturing, and use a qualified thin-sheet sequence or backing method.

The finished weld face or root is below the adjacent base-metal surface or required groove fill.

Insufficient deposition, excessive travel, poor fit-up, missing passes, or incorrect groove volume.

Verify joint dimensions and pass sequence, then evaluate and correct only under the approved disposition.

More weld metal above the face than the applicable profile limit allows.

Excess deposition, slow travel, poor groove sizing, or an attempt to compensate for inconsistent fit-up.

Control root gap and groove volume; specify profile only where the drawing or governing criteria require it.

Small droplets of metal attached around the weld zone.

Unstable arc, incorrect settings or polarity, poor shielding, contamination, long arc, or consumable issues.

Keep precision holes, threads, sealing faces, and cosmetic zones away from the weld or identify protection/masking requirements.

Angular change, bowing, buckling, shrinkage, or loss of dimensional position after welding.

Unbalanced heat, long continuous seams, asymmetric joints, high restraint, poor sequencing, or weak fixturing.

Balance joints, shorten or stagger welds where engineering allows, add datum-friendly fixturing features, and plan the sequence before detailing final tolerances.