当缸盖、机体等出现裂纹时,可采用电弧冷焊,但易产生气孔、白口等;若采用氧-乙炔冷焊,则效果较为理想,因气焊火焰在预热和施焊时,其温度都较电弧焊低,则可减小焊缝的应力,焊件不易产生白口与裂纹。下面就几年的实践,简述铸件的氧-乙炔冷焊工艺: (1)在裂缝铲出90°～120°的坡口,并清除周围的脏物。 When the cylinder head, body and other cracks occur, you can use arc cold welding, but easy to produce pores, white mouth, etc .; if the use of oxygen - acetylene cold welding, the effect is more ideal, because gas welding flame in the preheating and welding, the The temperature is lower than the arc welding, you can reduce the stress of the weld, welding is not easy to produce white mouth and cracks. Following a few years of practice, a brief description of the casting of oxygen - acetylene cold welding process: (1) in the crack shovel 90 ° ~ 120 ° bevel, and remove the surrounding dirt.