焊接系数,符号为φ,即焊接接头强度与母材强度之比。在ASME规范中焊接接头系数仅取决于该焊接接头型式和无损检测程度,一台容器不同的接头可以使用不同的焊接接头系数,对A、B、C、D四类焊接接头都规定了焊接接头系数,同时允许采用降低焊接接头系数而免除无损检测要求。
例如,使用热膨胀系数小的玻璃可以允许部件焊接在一起从而形成连续的一整块玻璃。
Using a glass that does not expand much when heated, for example, would enable components to be welded together, forming, in effect, a continuous piece of glass.
如果阀体的材料是可以焊接的,但膨胀系数差异很大,或者工作温度的变化幅度范围较大,螺纹连接部必须进行蜜封焊。
If the valve body material can be welded, but very different thermal expansion coefficient, or changes in operating temperature range of a larger thread junction closure weld must be honey.
本文首先通过有限元分析得到了轴力作用下的TT管节点在焊接区的应力分布以及应力集中系数。
The stress distribution and the stress concentration factor in the welding region of tubular TT-joints subjected to axial loads are analyzed using finite element method in this study.
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