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在压力容器强度计算时,我们常常会遇到纵焊缝系数与环焊缝系数不一致时如何选取焊缝系数的问题。普遍的做法是:采用相同的焊缝系数选取办法,用环焊缝的焊缝系数代入纵向应力公式,用纵焊缝的焊缝系数代入周向应力公式。也就是用环焊缝来校核纵向应力,用纵焊缝来校核周向应力。这也是GB150-89《钢制压力容器》3.2圆筒计算中所采用的办法。但是,这样的做法无疑忽略了一个事实,即无论是纵焊缝还是环焊缝都存在有纵向应力和周向应力。如果说焊缝系数是在焊接容器中考虑焊缝可能存在缺陷,或者由于焊接的热影响,焊缝或焊接热影响区的金
When calculating the strength of a pressure vessel, we often encounter the problem of how to choose the weld factor when the longitudinal weld factor is different from the girth weld factor. The common practice is to adopt the same method of selecting the weld factor, substitute the weld factor of the girth weld into the formula of the longitudinal stress, and substitute the weld factor of the girth weld into the formula of the circumferential stress. That is, the use of girth welds to check the longitudinal stress, vertical welds to check the circumferential stress. This is also GB150-89 “steel pressure vessel” 3.2 cylinder calculation used in the approach. However, such an approach undoubtedly ignores the fact that both longitudinal and circumferential welds have longitudinal and circumferential stresses. If the weld factor is considered in the welding vessel weld may be flawed, or due to the heat of welding, weld or weld heat affected zone of gold