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我厂生产的一种铝合金薄壁壳体铸件尺寸为900×320×300mm,壁厚为5mm。要求在水温为40～60℃,压力为2～2.5kgf/cm~2,持压时间不小于2分钟的条件下进行气密性试验,不允许有渗漏现象。但由于该铸件较大,渗漏也较严重,以致影响生产的顺利进行。为此,我们除了在铸造工艺上做了一些改进外,还对已渗漏的铸件进行了焊补。我们最初采用的焊补方法是将渗漏的部位用錾子将夹渣剔除干净,然后
I plant a thin aluminum alloy shell castings size 900 × 320 × 300mm, wall thickness 5mm. Requires the water temperature is 40 ~ 60 ℃, the pressure is 2 ~ 2.5kgf / cm ~ 2, holding time is not less than 2 minutes under the conditions of air tightness test, does not allow leakage. However, due to the larger castings, leakage is more serious, resulting in the smooth progress of production. To this end, in addition to the casting process we made some improvements, but also on the leakage casting has been repaired. The welding repair method we originally adopted was to remove the slag from the seepage site and then