平面钢闸门现场组焊质量超声波检测

Ultrasonic Testing of Site Weld Joint of Plane Steel Gate

对在建抽水蓄能电站的平面钢闸门进行焊接质量进行超声波复检时,结果发现闸门面板对接焊缝存在超标缺欠,主要表现为长条形的根部未焊透。形成的原因经研究分析为,闸门现场组焊时根部对口间隙不符合要求引起的是其主要原因。在初次进行超声波检测时,由于对检测标准中对于该焊接位置及工艺的理解偏误差造成对超标缺欠的误判。经重新评定,判定该缺欠为不合格缺陷,并根据形成原因对焊接工艺及超声波检测过程提出了建议。

In a repeated welding ultrasonic testing of plane steel gate of a pumped storage power station under construction was conducted,the unqualified defects were found,which exhibits a type of elongated incomplete penetration defect of the root. By analysis,The main reason for the defect was considered as that the clearance of the compound root didn＇t conform to the requirements. In the initial ultrasonic testing,for the inaccurate understanding of the testing standard for the welding position and process, the overweight defects were misunderstood as qualified. Through to the reassessmen t,such defects were confirmed as unqualified defects. Furthermore,the welding technology and ultrasonic testing process is also proposed according to the forming reason of the defects.