A Metallurgical Aspect of Hot Cracking and Toughness of Weld Metal

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Concerning hot cracking and notch toughness of steel weld metal, Fe-Ni and Fe-C peritectic reactions were experimentaly studied and micro-segregation of sulphur, phosphor and manganese in weld metals by gas-shielded arc welding and submerged arc welding were analysed by the electron probe microanalyser. From the experimental results, it is concluded that the peritectic reaction has a very important significance to micro-segregation and hot cracking of weld metal. A remarkable sulphur segregation at grain boundary and crack in weld metal was recognized in spite of its very small content such as about 0.01%, when weld metal solidified through peritectic reaction. But excepting the weld metal containing 0.1% phosphor and 4.36% nickel, no remarkable change of phosphor concentration at grain boundary and crack was observed by the EPMA in very weld metal. This is explained by the greater solubility of phosphor in iron than that of sulphur.
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