摘要
利用温差产生的协调形变解决小直径不锈钢管道焊接接头应力腐蚀问题是一种快捷而有效的方法,虽然采用火焰加热形成的温差可以得到一定的消除应力效果,但可控性差,不利于现场实施。提出一种新的温差形成技术——感应加热处理。利用有限元数值模拟,对直径100mm的不锈钢小径管环缝焊接接头的残余应力及感应加热法消除焊接应力效果进行了研究,得到了线圈位置、加热频率、加热电流、加热时间等工艺参数对消除焊接应力效果的影响规律以及最佳工艺参数的选取原则。结果表明,感应加热法弥补了火焰加热法的不足,在焊缝内表面获得压应力的同时,可以将加热区的新增应力控制在母材屈服强度的一半以内。
The stress corrosion cracking in welded stainless steel tubes with small - diameter is mainly related to the welding residual stresses in the girth -weld. A quick and effective way to fix the problem is the compatible deformation method from temperature -difference. The welding residual stresses in tubes can be relieved to some extent by using the flame heating process which produces a temperature differ- ence, but the process is not convenient applied to industry because of its poor controllable feature. A new temperature - difference formation technology - induction heating treatment was presented here. By FEM analysis, welding residual stresses and the process of induction heating for stress relief were simulated on 100mm diameter of tube. h indicates the effects of some factors such as the location of heating coil, heating frequency, heating current and heating time on the stress relief. The choosing principle of the optimal parameter was also proposed. The results show that the induction heating method may effectively cover the shortage of the flame heating method. Apart from rapid and convenient, the compressive stresses may be obtained on the inner surface of the girth - weld as lower tensile residual stresses （ not more than 1/2 yield strength） existed in the heating area.
出处
《压力容器》
北大核心
2009年第5期38-43,50,共7页
Pressure Vessel Technology
