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The purpose of this study is evaluation of proper welding condition in order to solve the problems such as cast iron weld cracking, HAZ embrittlement. The formation of martensite in welding of the gray cast iron by arc welding is related to weld cracking. The effect of pre-heating and post-heating to microstructure and hardness of weld joint were examined. Main results obtained were as follows. In case of autogenous welding by GTAW, the number of crack was significantly decreased with increasing welding heat input and pre-heat temperature. But crack sensitivity was increased by martensite formation due to increasing cooling rate with increasing of base metal thickness. In case of bead on plate welding by GTAW, crack sensitivity was increased with increasing welding current, and welding current exhibiting no crack was increased with pre-heat temperature. The most of cracks formed at deposited weld metal were solidification crack in the case of 316L buttering. The main cause of GTAW deposited metal cracking was martensitic transformation. The GTAW range for crack free was very severe and narrow. To minimize the welding crack sensitivity, buttering gray cast iron by 316L welding electrode was very effective and the application of preheating made welding range broad.

Study on Metallurgical Characteristic of Weld Metal for Gray Cast Irons - Weld Microstructure and Crack Sensitivity -