材质为30CrMnSiA钢的发动机架,在使用一段时间后,常发现裂纹较多,按苏联原工艺规定修焊后,往往在焊接处又重复产生裂纹。有时,还发现在补焊和磁化后无裂纹,过一段时间又在焊修处出现裂纹。这些现象的存在,影响了修理进度和战备使用,并带来了严重隐患。首先,我们从焊条及药皮的成分,以及操作方面采取了一些措施,提高了补焊质量,减少了气孔、夹渣和浮积等,但并没有避免修焊后裂纹的产生。 Material for the 30CrMnSiA steel engine frame, after use for a period of time, often found more cracks, according to the Soviet Union, the original process of repair welding, welding often repeated cracks. Sometimes it was found that there was no crack after repairing and magnetizing and cracking occurred again at the welding repair after a period of time. The existence of these phenomena has affected the progress of the repairs and the use of combat readiness and has brought about serious risks. First of all, we take some measures from the composition of electrode and coating, as well as the operation, to improve the welding quality, reduce the porosity, slag and floats, but did not avoid the crack after repair welding.