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A study on cold cracking susceptibility in high strength steel fillet weld joints
Author(s) -
ElBatahgy AbdelMonem
Publication year - 1994
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199401212
Subject(s) - metallurgy , welding , cracking , materials science , fillet weld , fillet (mechanics) , microstructure , composite material
Controlled thermal severity (CTS) test which simulates the conditions in a single‐pass fillet welding was carried out to determine the suitable minimum preheating temperature for the cold‐crack‐free welding of high strength steel ASTM A 516‐70. The dependence of this minimum preheating temperature on diffusible hydrogen contents in weld metal was clarified. Then, the effect of climatic conditions on cold cracking susceptibility as a function of diffusible hydrogen contents in weld metal was studied. It is found that the cold cracking susceptibility of high strength steel is primarily related to the microsturcture of the HAZ which, in turn, is related to the preheating temperature. A lower preheating level, which resulted in harder microstructure, led to increased susceptibility. Suitable minimum preheating temperature required to prevent cold cracking increased with the increase in diffusible hydrogen contents of weld metal as a function of climatic conditions.