摘要
Abstract
Aiming at some characteristics of new material grade Q690 moderate thickness steel plate with high strength and low alloy, such as cold and hot welding crack, big hardening tendency, high residual stress after welding, and strong hydrogen induced cracking sensitivity. By researching on MK·GHS70 welding wire matching with high strength Q690 steel, including pre-welding treatment, controlling preheating temperature and interlayer temperature, reducing welding heat input and the right heat treatment after welding, to obtain reasonable welding parameters, and through ultrasonic flaw detection and mechanical performance inspection process feasibility. The results showed the full penetration welding process of high strength Q690 steel plate completely meet the requirements of design and production. It successfully solved the full penetration welding problem for steel plate moderate thickness. This method has been successfully adopted in offshore platform crane, marine derrick and other equipment, and achieved good results.关键词
焊接/Q690高强钢中厚板/焊接裂纹/焊接参数Key words
welding/Q690 high strength steel plate with moderate thickness/welding crack/welding parameter分类
能源科技
