What are the Main Points of Gas Welding Repair Welding of Gray Cast Iron?

The weldability of gray cast iron is poor. During the welding process, the welded joint is prone to stress cracks; the weld is prone to porosity; easy to generate insoluble SiO2; easy to appear brittle and hard white structure; due to the liquid metal fluidity of gray cast iron Very good, can only be welded in the flat welding position. As a Grey Iron Casting Company, share with you.

Because the temperature of the gas welding flame is much lower than the arc temperature, the heating and cooling of the castings during welding are relatively slow, which can effectively prevent white holes, cracks and pores. Therefore, the welding quality is high, and it is easy to machine cutting after welding. The disadvantages of gas welding are low productivity, high cost, poor working conditions, and difficult penetration of large castings.

Preparation before welding

If the casting defect is a crack, find both ends of the crack and drill a crack arrest hole (usually about 6mm in diameter). The methods to find cracks include: look with a magnifying glass. When the cracks are not obvious, you can heat it with a flame at 200～300℃, and it will be displayed after it cools down. The kerosene penetration method is used, that is, the oil stains on the surface are wiped off after applying kerosene, and then sprinkled. Put a thin layer of talcum powder (quick lime powder) and tap it with a small hammer to vibrate to show the traces of the cracks; use the hydraulic test method to find the cracks.

Grey Cast Iron Casting

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