循环流化床热水锅炉省煤器的焊接工艺

循环流化床热水锅炉省煤器蛇形管的焊接质量是整个锅炉安装质量的关键,省煤器蛇形管管径小、管排间距小、焊接场地狭窄,焊接时有三面是障碍焊,焊口数量多,所以焊接操作难度大,而且一旦在后续工作中发现有焊接缺陷,将很难进行返修。针对这种情况,为保证一次焊接合格,采用了GTAW打底、SMAW填充盖面的组合焊接方法,自制了小型钨极氩弧焊焊炬。通过采用合理的焊接顺序、工艺和方法,并及时配合外观检查,使3台锅炉省煤器蛇形管的焊接一次合格率达到97.6%,满足了工程需要。

Welding Technology of Economizer of Circulating Fluidized Bed Hot Water Boiler

The diame ter of serpentine pipe of economizer of circulating fluidized bed hot water boil-er is small,and the distance between rows of pipes is small either.The spac e for welding operation is so narrow that welding operation is difficult on thre e sides,and large amount of welds makes situation worse.To insure the welding quality,the combined welding method of GTAW backing and SMAW filling cosmetic is adopted.A small type torch is made for argon tungsten arc welding.The imple mentation in site shows the welding quality is perfect.