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我厂年产铸件约840吨,废品率12％。曾采用铸308、铸408等镍基焊条冷焊或气焊热焊法进行补焊。由于成本高、生产率低、焊缝颜色不同等缺点,对有稍大缺陷的铸件都报废回炉。从1977年开始,采用我省建阳焊条厂生产的铸248焊条不预热焊。但因未掌握该焊条的工艺特性,往往在刚度大的部位产生裂纹,小缺陷补焊时则出现白口,加工困难,因此当时只用来补焊边角部他及非加工面的缺陷。经过几年实践,逐渐掌握了补焊工艺要点,成功
I plant an annual output of about 840 tons of castings, 12% rejection rate. Had used cast 308, cast 408 and other nickel-based electrode cold welding or gas welding hot welding repair welding. Due to the high cost, low productivity, different weld color and other shortcomings, have slightly larger defects of the cast scrap scrap. From 1977 onwards, the use of our province Jianyang electrode factory production of cast 248 electrode without preheating. However, because of the lack of control of the welding rod’s process characteristics, cracks tend to occur in the areas with large rigidity and white holes appear in the small defects when repaired. Therefore, it is only used for repairing the defects on the corners and on the non-machined surfaces. After several years of practice, gradually mastered the main points of welding technology, success