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Evaluation of the nature of internal defects, causes of defects and preventive measures ④

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Incomplete fusion



When the ultrasonic probe is translated, the waveform is relatively stable. When detecting on both sides, the reflected wave amplitude is different, and sometimes it can only be detected from one side.



The reasons: the groove is not clean, the welding speed is too fast, the current is too small or too large, the angle of the electrode is wrong, the arc blows, etc.



Preventive measures: correct selection of groove and current, clean groove, correct operation to prevent welding deviation, etc.