A Micro-Fractographical Approach to Weld Cracking of Mild Steel

Abstract

As the result of the application of micro-fractography to the investigation of the weld cracking of mild steel, the following fact was clarified: that many of fan-like patterns, which were the evidence of hydrogen embrittlement cracking, and the micro-void coalescence (the dimple pattern) between them were observed on the fracture surface of cold cracking of the deposit metal and the heat affected zone, and that the evidence of the cracking along the dendritic boundaries was observed on the fracture surface of the crater cracking.