摘要
在高压闸阀的闸板上堆焊钴基硬质合金,焊接裂纹是常见缺陷。而在基体材料为CA15铸钢件(马氏体不锈钢)的高压闸阀的闸板上堆焊钴基硬质合金GoCr-A而不出现裂纹缺陷则是更困难的工艺。基于焊接性分析、焊接工艺评定试验、试生产以及试生产后的工艺改进,焊接裂纹缺陷可以大幅度减少甚至消除。阀门制造商可根据阀门口径的大小选择合适的工艺方法。一种方法是对小口径阀门闸板采用直接堆焊,另一种方法是对中、大口径闸板采用在堆焊CoCr-A之前先堆焊隔离层E309的方法。
The welding crack is a common defect in depositing cobalt-based alloy on gates of high-pressure gate valve,while the welding crack does not appears in hardfacing the cobalt-based alloy on the base metal CA15 steel casting (martensitic stainless steel).Based on analyses on weldability,welding procedure qualification test,trial production,and process improvement after trial production,welding crack can be substantially reduced or even eliminated.Valve manufacturer can choose suitable process according to the diameter of valve.For small diameter valve,the gate can be directly deposited; For the other valve,the gate can be firstly deposited the isolation layer of E309 before the hardfacing of CoCr-A layer.
出处
《焊接》
北大核心
2011年第1期66-68,72,共3页
Welding & Joining
关键词
闸阀
堆焊
隔离层
gate valve
hardfacing
isolation layer
