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如何观察铸铁补焊的预热温度,可用以下几种方法来观察判断:1.当铸铁加热到650℃～700℃时,铸铁的表面开始成暗红色。2.当铸铁加热温度在450℃以下,用氧乙炔碳化焰来
How to observe the preheating temperature of cast iron repair welding can be observed and judged by the following methods: 1. When the cast iron heated to 650 ℃ ~ 700 ℃, the surface of the cast iron began to dark red. 2. When the cast iron heating temperature below 450 ℃, with oxyacetylene carbon flame