材料科学与工程学报2025，Vol.43Issue(2)：229-234,6.DOI:10.14136/j.cnki.issn1673-2812.2025.02.009
大厚度DH36-Z35钢打底焊不清根焊接接头微观组织与力学性能
Microstructure and Mechanical Properties of Heavy Thickness Steel DH36-Z35 Welded Joint Without Back Chipping
摘要
Abstract
Semi-automatic gas metal arc bottom welding(CHW50C6SM welding wire)+automatic submerged arc fill and cover welding were used to butt flat welding of normalized marine engineering steel DH36-Z35 with 60 mm thickness.The microstructure and mechanical properties of welded joint without back chipping were investigated.The results showed that the weld zone of joint was mainly composed of proeutectoid ferrite and acicular ferrite.The coarse-grained heat affect zone was composed of lath bainite and granular bainite,and the fine-grained zone was composed of ferrite and pearlite.The strength,plasticity and impact toughness at-20℃ of the joint without back chipping were equivalent to the joint with back chipping,all of which met the requirements of relevant standards,and the bottom layer welding without back chipping technology can be canceled to reduce production costs.关键词
海工钢/不清根焊接/大厚度/微观组织/力学性能Key words
Ocean engineering steel/Welding without back chipping/Heavy thickness/Micro-structure/Mechanical properties分类
矿业与冶金引用本文复制引用
朱军,方晨鹏,连江滨,姚秋峰,叶建明,罗伟,窦战国..大厚度DH36-Z35钢打底焊不清根焊接接头微观组织与力学性能[J].材料科学与工程学报,2025,43(2):229-234,6.基金项目
浙江大学龙泉创新中心项目(ZDLQ 2022010) （ZDLQ 2022010）
浙江领雁研发攻关计划项目(2022C01149) （2022C01149）
