6mm铝合金母线壳体焊缝超声波检测研究

Study on Ultrasonic Butt Weld Detection of 6 mm Aluminum Alloy Bus Shell

现行的超声波检测标准仅明确了8 mm及以上厚度铝合金对接焊缝验收规范,而GIS(气体绝缘全封闭组合电器)设备母线壳体一般采用厚度为6 mm的铝镁合金制备,其内部充有一定压力的SF6绝缘气体,如果焊接过程中接头部位焊接不良,则易发生SF6气体泄漏事故,影响设备的正常运行。针对该问题,通过对6 mm铝合金GIS设备母线壳体对接焊缝焊接工艺及焊接缺陷成因的分析,制订了合理的超声波检测工艺,并对该工艺进行了验证。结果表明,该工艺是合理有效的。

The current ultrasonic testing standard only clarifies the acceptance code for butt weld of aluminium alloy with a thickness of 8 mm and above.However,the GIS bus shell is generally made of 6 mm aluminum-magnesium alloy with the insulation gas of SF6 in it.Poor welding of the joints may lead to SF6 leakage and thus affect the normal operation of equipment.Therefore,the paper analyzes welding technology and welding defects of 6 mm aluminium alloy GIS bus shell to formulate a reasonable ultrasonic testing process and verify it.The results show that the process is reasonable and effective.