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对水工建筑物金属结构中的平板闸门、弧形闸门等构件的T型接头的焊接工艺来说,多年来一直存在着未焊透问题。因闸门是在高水头、震动较大的工况下运行的,为此现行闸门制造工艺规范中,对有特殊要求的角焊缝要求焊透。经过多次试验与研究,分别制定了手弧焊和自动埋弧焊时的焊透工艺,并先后应用于葛洲坝电厂工作闸门主梁和边梁的自动埋弧焊和该电厂一套大机组检修门及三套小机组检修门的手弧焊。其中手弧焊和自动埋弧焊的焊透率分别为95％和90％。现将试验情况及所采用的新工艺介绍如下:
For the welding process of T-joints such as slab gate, arc gate and other components in the metal structure of hydraulic structures, the problem of incomplete penetration has been existed for many years. Due to the gate is in the high head, vibration larger operating conditions, for the current gate manufacturing process specifications, the fillet weld with special requirements penetration. After many tests and studies, respectively, the development of hand arc welding and automatic submerged arc welding process, and has been applied to the work of Gezhouba power plant gate and girder girder automatic submerged arc welding and a large unit maintenance of the power plant Door and three sets of small unit hand arc welding. One hand arc welding and automatic submerged arc welding of 95% and 90% respectively. Now the test conditions and the introduction of new technology are as follows: