我厂是生产传动器专业厂家，壳体为ＨＴ２００～４００铸铁材料。产品如图１所示。 在对其做压力试验时，发现Ａ处漏油，在对Ａ处进行补焊过程中，由于操作失误，在补焊处发生急冷事故，致使产品的Ｃ处产生一长８０ ｍｍ裂纹，且在开口端完全裂开，如图２所示（Ａ处已补好）。 Our factory is the professional manufacturer of the production of transmission, the shell is HT200 ~ 400 cast iron material. Products shown in Figure 1. In its pressure test, it was found that the A Department of oil leaks, in A Department of welding repair process, due to operational errors occurred in the repair Department of the rapid cooling accident, resulting in a C product at 80 mm cracks, and in the The open end is completely split, as shown in Figure 2 (A has been completed).