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一、我廠对锻件電磁探傷的情况机械構件中如存在有裂紋,卽割断了金屬基体的连貫性。不論它的形狀大小、数量多寡、背境深淺、以及所在位置如何,都会削弱金屬的强度極限,耐疲極限、及相对靱性;無論是在动应力或靜应力的作用下,它都会成为構件的弱點。日子長久,卽能逐漸引起应力集中,加速構件的破裂;尤以在机車車輛另件中的裂紋,为害尤甚。故发現有裂紋的机件,一向为机車車輛所嚴禁使用。我厂对机車車輛上的主要鍛件,在机械加工后都要進行电磁探伤,以檢查另件的表面狀况及是否有裂紋。电磁探伤的主要原理是根据另件表面由於缺陷的存在而造成磁场中断,磁力綫不能通过,铁粉集聚在这些地方而顯示出一种很明顯的标記,卽所謂铁粉示跡,以判断缺陷的位置、形狀、或大
First, my factory forgings electromagnetic detection of mechanical components if there is a crack, cut off the continuity of the metal substrate. Regardless of its shape and size, quantity, depth, and location, it will weaken the metal’s strength limit, fatigue resistance and relative rigidity; it will become a component either under dynamic stress or static stress weakness. Long days, 卽 can gradually lead to stress concentration, accelerate the crack components; especially in the rolling stock pieces of the other pieces of damage, especially. It is found that cracks in the parts, has always been prohibited for the use of rolling stock. I plant on the rolling stock forgings, after machining must be carried out by electromagnetic detection to check the other parts of the surface conditions and whether there are cracks. The main principle of electromagnetic detection is based on the other parts of the surface due to the presence of defects caused by the magnetic field interruption, the magnetic field lines can not pass, iron powder gathered in these places and showed a very obvious mark, 卽 so-called iron traces, to determine Defective position, shape, or large