三、双面对接焊缝探伤时各种伪缺陷的判断1.油层反射讯号由于被测面凹凸不平或者是焊缝附近金属飞溅物没有磨平,在探头沿焊缝方向移动过程中,探头楔块与被测面之间局部地方贴合不紧,造成一定的空隙,而其间又存在着较多的耦合剂(例如机油),从而将造成油层反射讯号。这种讯号,有时由于油层的轻微流动,即使探头不 Third, the double-sided butt weld inspection of a variety of false defects judgment 1. Reflected oil reservoir due to the uneven surface or the metal splash near the weld is not polished, the probe along the weld direction of movement, the probe wedge The local bonding between the block and the measured surface is not tight, resulting in a certain gap, while there are more coupling agents (for example, oil) between them, which will cause the oil layer to reflect signals. This signal, sometimes due to the slight flow of the reservoir, even though the probe is not