灰铸铁的焊接性能灰铸铁对加热后的冷却速度比较敏感,抗拉能力差,在迅速加热或冷却时容易产生白口组织而变脆,往往被焊接时的应力胀裂或缩裂。因此预热和缓冷对于焊接灰铸铁件来讲是极为重要的。一般用木炭火预热较好,先用微火,随着 Gray cast iron welding performance Gray cast iron is more sensitive to the cooling rate after heating, poor tensile strength, easy to produce white tissue in the rapid heating or cooling brittle, often when welding stress cracking or shrinkage. Therefore, preheating and slow cooling are very important for welding gray cast iron. Preheat charcoal fire generally better, first with micro-fire, with