箱型门槽安装焊接工艺及问题处理

Installation and welding process and problem handling of box shaped door slot

摘要

清原抽水蓄能电站在尾水洞内设有尾水事故闸门，闸门门槽为方形钢衬结构，衬板材料为不锈钢复合板(Q355B+06Cr19Ni10),板厚30 mm,其中基层厚度26 mm,不锈钢复合层厚度4 mm,衬板外侧结构为普通低合金钢和碳素钢材料。门槽上下游均为方形接口，采用焊接方式与尾水管钢衬相连，其余部位为封闭结构。尾水事故闸门操作方式为动闭静启。闸门挡水水头为128 m,动水闭门水头为114 m。根据门槽结构特点，研究制定了焊接工艺方案，改进了门槽复合板焊接接头设计，对门槽仰角焊缝焊接提出了改进的焊接工艺，门槽衬板连接焊缝质量达到设计规定的一类焊缝要求，焊接质量良好。

Abstract

The Qingyuan Pumped Storage Power Station is equipped with a tail water emergency gate in the tailrace tunnel. The emergency gate slot is a square steel lining structure, and the lining plate material is stainless steel composite plate(Q355B+06Cr19Ni10), with a thickness of 30 mm. The base layer thickness is 26 mm, and the stainless steel composite layer thickness is 4 mm. The outer structure of the lining plate is made of ordinary low alloy steel and carbon steel materials. The upstream and downstream of the gate slot are square interfaces, connected to the steel lining of the draft tube by welding, and the rest are closed structures. The operation mode of the tail water emergency gate is dynamic closing and static opening. The water retaining head of the gate is 128 m, and the water closing head of the dynamic water is 114 m. Based on the structural characteristics of the gate slot, a welding process plan has been developed, and the design of the composite plate welding joint for the gate slot has been improved. An improved welding process has been proposed for the elevation weld seam of the gate slot. The quality of the connecting weld seam of the gate slot lining plate meets the Class I weld seam requirements specified in the design, and the welding quality is good.

关键词

箱型门槽 / 不锈钢复合板 / 焊接

Key words

box shaped door slot / stainless steel composite plate / weld