一些可锻铸铁件(如汽车轮毂中与轴承接触面)常因磨损严重而报废,而焊补后,往往由于硬度高不能进行机加工而影响使用。根据焊接规范对熔深的影响即焊接规范小,熔深浅,母材熔化率低,焊缝硬度低的理论,采用 J422焊条堆焊可锻铸铁件,是较为理想的工艺,其焊后可以进行切削加工。1 焊接工艺1.1 焊前准备焊前要将待焊面的油污清洗干净。为防止 Some of the malleable iron parts (such as the wheel hub and bearing contact surface) often scrapped due to serious wear and tear, and after welding, often due to high hardness can not be affected by the use of machining. According to the welding rules on the impact of the welding depth that is small, shallow penetration, base metal melting rate is low, low weld hardness theory, the use of J422 electrode surfacing malleable iron castings, is an ideal process, which can be after cutting machining . A welding process 1.1 Preparation of welding Before welding to be welded surface oil to clean. To prevent