Abstract
Abstract Nickel-iron cast iron welding rods are comparatively susceptible to hot cracking. Using the HRL-1 Type hot cracking tester and the critical deformation velocity method, the influence of rare earth yttrium and of carbon, cobalt, silicon, copper, manganese, sulphur and phosphorus on hot cracking has been studied to improve the hot cracking resistance properties of nickel-iron welding rods. Experiments showed that there was an optimum value for the content of rare earth yttrium and of carbon, cobalt and silicon in weld metal, and that to deviate from this value led in each case to a deterioration in hot cracking resistance properties: manganese, copper, sulphur and phosphorus all increased weld metal hot cracking susceptibility. It is concluded that use of the rare earth yttrium and of cobalt and carbon markedly improves the hot cracking resistance properties of nickel-iron type cast iron welding rods.
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