inum). Oxide inclusions are less dense than the surrounding materials and, therefore, appear asdark irregularly shaped discontinuities inthe radiograph. Discontinuities in Gas Metal Arc Welds (GMAW) The following discontinuities are monly found inGMAW welds. Whiskers are short lengths ofweld electrode wire, visible onthe top orbottom surface ofthe weld orcontained within the weld. Onaradiograph they appear aslight, "wire like" indications. Burn through (icicles) results when too much heat causes excessive weld metal to rate the weld zone. Lumps ofmetal sag through the weld creating athick globular condition onthe back ofthe weld. Onaradiograph, burn through appears asdark spots surrounded bylight globular areas. welld-02 (plete Root Fusion 、根部未熔合) welld-03 (Insuffucient Reinforcement 、增强高)
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