一、引言承受变载荷的焊接结构破坏的主要原因之一是疲劳。对焊接接头区的疲劳问题,国内外均做了相当多的工作,但对焊接咬边的影响研究却少见。从实践中看,咬边在焊接中是难以避免的,往往呈尖角形,多发生于焊趾区。在疲劳应力的作用下咬边会发展成最危险的表面裂纹,最后导致破裂。因此,本文对具有咬边焊接接缝的寿命进行探讨。 I. INTRODUCTION One of the main reasons for the damage of welded structure subjected to variable load is fatigue. For the fatigue problem of welded joint area, a great deal of work has been done at home and abroad, but the research on the influence of welding undercut is rare. From a practical point of view, undercut welding is inevitable, often sharp-pointed, occurred in the weld toe area. Under the action of fatigue stress undercut will develop into the most dangerous surface cracks, leading to rupture. Therefore, this article discusses the life of undercuts with undercuts.