技术与应用
发布日期:2017-06-07 23:39 浏览次数:次
起重机的多个关键结构件由合金钢通过弯折、焊接而形成。由于这些结构件在使用过程中服役条件恶劣:不仅需要承受复杂的疲劳、冲击载荷,而且要面对低温、腐蚀性的外部环境,因此在接头中存在焊接缺陷的部位容易出现结构性断裂,造成事故。所以采用合理有效的技术手段对焊接缺陷进行检测与评价具有重要的意义。目前起重机械的常规无损检测方法主要有[1]:射线检测、超声检测、磁粉检测、渗透检测和电磁检测等。由于这些方法存在对几何形状敏感、需要接近被检对象、只能进行局部扫描、需要停机测试以及容易造成漏检等不足,检测结果很难对设备的完整性进行评价,而声发射检测方法恰好可以弥补这方面的不足。
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