Open AccessWelding procedure qualification of Q345 grade fire-resistant steel based on Jmat-pro calculation
Author(s) -
Wan Rongchun,
Fang Yimeng,
Cao Baoshan,
Ma Qingyan,
Xun Gong
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1903/1/012001
Subject(s) - welding , continuous cooling transformation , cracking , materials science , heat affected zone , isothermal process , metallurgy , nuclear engineering , composite material , thermodynamics , physics , bainite , microstructure , engineering , austenite
The welding process of two Q345 grade low Mo (about 0.25 wt.%) fire-resistant steels will be calculated and evaluated in this paper. The continuous cooling transformation (CCT) curve and isothermal transformation (TTT) curve of test steel were calculated by Jmat-pro software. The welding processes of steels were evaluated by measuring the continuous cooling transition (SH-CCT) curves of welding heat affected zone. The test results show that when the actual cooling time of Q1 steel is t 8/5 >43s, cracking does not occur in the HAZ of welding and near the fusion zone, while when t 8/5 44s, cracking does not occur in the welding heat affected zone and the vicinity of the fusion zone, while when t 8/5 <44s, cracking may occur in the heat affected zone or the fusion zone. In addition, Jmat-pro software has a certain accuracy for the calculation of Ac 3 , but has a large error for the continuous cooling transformation (CCT) curve, especially the difference between the calculated value and the measured value of Q2 steel is larger, which only has reference value.