某水电厂蝶阀安装合拢焊缝拘束应力施工监测

Constraint Stress Construction Monitoring of Butterfly Valve Field Closured Weld Joint in Hydropower Station

水电厂蝶阀安装焊缝实际就是压力钢管与金属蜗壳端的合拢焊缝。蝶阀安装时,金属蜗壳与压力钢管均已经与锚筋固定、并已浇筑混凝土。此时蝶阀安装焊接施工,由于焊缝收缩而使焊缝承受强大的拘束应力,焊缝易于产生焊接裂纹。为保证蝶阀安装焊缝的顺利施工,对合拢焊缝进行焊接拘束应力的施工监测,利用实测数据进行具体分析,从而指导蝶阀安装合拢焊缝的焊接施工。

Butterfly valve field weld joint is actually the closured weld joint of steel penstock and spiral case. Steel penstock and spiral case are fixed by anchor bar and poured with concrete when the butterfly valve is in installation. The weld joints are more prone to welding crack because of strong weld shrinkage-induced constraint stress. In order to the completion of butterfly valve field closured weld joint, field construction monitoring methods are taken. It can instruct butterfly valve field closured weld joint and welding procedure in welding construction according to measurement data and analysis.