材料期刊网

Evaluation of Cracking Resistance of CopperBearing Age Hardening Steel Weldment

CHAI Feng , YANG Caifu , SU Hang , ZHANG Yongquan , XU Zhou

钢铁研究学报(英文版)

The weldability of a lowcarbon copperbearing age hardening steel was evaluated using cracking susceptibility calculation, HAZ maximum hardness measurement, and Ygroove cracking evaluation test. The results show that the hardenability characteristics and cold cracking susceptibility of the steel are very low. The results also indicate that a crackfree weldment can be obtained during the welding of this type of steel even at an ambient temperature as low as -5 ℃ as well as in an absolute humidity lower than 4 000 Pa without any preheat treatment. A slight preheat treatment can prevent the joint from cracking when welding is carried out at lower ambient temperature or higher absolute humidity.

关键词: copperbearing age hardening steel;weldability;cracking resistance;Ygroove cracking test