文档介绍：焊接灰口铸铁(Welding grey cast iron)
News headlines:
Content modification: for welding grey cast iron, cracks may appear in deformation and prevent cracks: The welding stress can be reduced by means of fine straight welding electrode, small current and intermittent welding. The stress can be eliminated by hammering weld, preventing cracks.
When the weld is cooled, it can be used to make up the free shrinkage of the bottom, so as to avoid excessive force and crack.
3 apply thermal welding and control the temperature.
When the temperature higher than 600 °C, due to arise from a certain plastic deformation. And eliminate part of the internal stress, and generally at 600 °C
Thermal stress cracks are not produced when welding above.
Welding method of grey cast iron:
The welding method of grey cast iron is mainly used for welding electrode arc welding, gas welding and brazing. . According to the welding parts whether preheating before welding can be divided into cold welding, the welding rod arc welding and half hot welding (preheating temperature below 400 °C) and hot welding (preheat temperature 600-600 °C).
Welding process of grey cast iron.
4. 4. 1. Cold welding method arc cold welding method is weldment no preheating before welding, the welding process is no auxiliary heating, so it can accelerate the weld productivity, reduce costs, improve labor condition, reduce welding d